xref: /freebsd/libexec/bootpd/hwaddr.c (revision 66fd12cf4896eb08ad8e7a2627537f84ead84dd3)
1 /*
2  * hwaddr.c - routines that deal with hardware addresses.
3  * (i.e. Ethernet)
4  *
5  * $FreeBSD$
6  */
7 
8 #include <sys/types.h>
9 #include <sys/param.h>
10 #include <sys/socket.h>
11 #include <sys/ioctl.h>
12 
13 #if defined(SUNOS) || defined(SVR4)
14 #include <sys/sockio.h>
15 #endif
16 #ifdef	SVR4
17 #include <sys/stream.h>
18 #include <stropts.h>
19 #include <fcntl.h>
20 #endif
21 
22 #ifdef _AIX32
23 #include <sys/time.h>	/* for struct timeval in net/if.h */
24 #include <net/if.h> 	/* for struct ifnet in net/if_arp.h */
25 #endif
26 
27 #include <net/if_arp.h>
28 #include <netinet/in.h>
29 
30 #ifdef WIN_TCP
31 #include <netinet/if_ether.h>
32 #include <sys/dlpi.h>
33 #endif
34 
35 #include <stdio.h>
36 #ifndef	NO_UNISTD
37 #include <unistd.h>
38 #endif
39 #include <syslog.h>
40 
41 #ifndef	ATF_INUSE	/* Not defined on some systems (i.e. Linux) */
42 #define	ATF_INUSE 0
43 #endif
44 
45 /* For BSD 4.4, set arp entry by writing to routing socket */
46 #if defined(BSD)
47 #if BSD >= 199306
48 extern int bsd_arp_set(struct in_addr *, char *, int);
49 #endif
50 #endif
51 
52 #include "bptypes.h"
53 #include "hwaddr.h"
54 #include "report.h"
55 
56 extern int debug;
57 
58 /*
59  * Hardware address lengths (in bytes) and network name based on hardware
60  * type code.  List in order specified by Assigned Numbers RFC; Array index
61  * is hardware type code.  Entries marked as zero are unknown to the author
62  * at this time.  .  .  .
63  */
64 
65 struct hwinfo hwinfolist[] =
66 {
67 	{0, "Reserved"},			/* Type 0:  Reserved (don't use this)   */
68 	{6, "Ethernet"},			/* Type 1:  10Mb Ethernet (48 bits)	*/
69 	{1, "3Mb Ethernet"},		/* Type 2:   3Mb Ethernet (8 bits)	*/
70 	{0, "AX.25"},				/* Type 3:  Amateur Radio AX.25		*/
71 	{1, "ProNET"},				/* Type 4:  Proteon ProNET Token Ring   */
72 	{0, "Chaos"},				/* Type 5:  Chaos			*/
73 	{6, "IEEE 802"},			/* Type 6:  IEEE 802 Networks		*/
74 	{0, "ARCNET"}				/* Type 7:  ARCNET			*/
75 };
76 int hwinfocnt = sizeof(hwinfolist) / sizeof(hwinfolist[0]);
77 
78 
79 /*
80  * Setup the arp cache so that IP address 'ia' will be temporarily
81  * bound to hardware address 'ha' of length 'len'.
82  */
83 void
84 setarp(int s, struct in_addr *ia, int hafamily, u_char *haddr, int halen)
85 {
86 #ifdef	SIOCSARP
87 #ifdef	WIN_TCP
88 	/* This is an SVR4 with different networking code from
89 	 * Wollongong WIN-TCP.  Not quite like the Lachman code.
90 	 * Code from: drew@drewsun.FEITH.COM (Andrew B. Sudell)
91 	 */
92 #undef	SIOCSARP
93 #define	SIOCSARP ARP_ADD
94 	struct arptab arpreq;		/* Arp table entry */
95 
96 	bzero((caddr_t) &arpreq, sizeof(arpreq));
97 	arpreq.at_flags = ATF_COM;
98 
99 	/* Set up IP address */
100 	arpreq.at_in = ia->s_addr;
101 
102 	/* Set up Hardware Address */
103 	bcopy(haddr, arpreq.at_enaddr, halen);
104 
105 	/* Set the Date Link type. */
106 	/* XXX - Translate (hafamily) to dltype somehow? */
107 	arpreq.at_dltype = DL_ETHER;
108 
109 #else	/* WIN_TCP */
110 	/* Good old Berkeley way. */
111 	struct arpreq arpreq;		/* Arp request ioctl block */
112 	struct sockaddr_in *si;
113 	char *p;
114 
115 	bzero((caddr_t) &arpreq, sizeof(arpreq));
116 	arpreq.arp_flags = ATF_INUSE | ATF_COM;
117 
118 	/* Set up the protocol address. */
119 	arpreq.arp_pa.sa_family = AF_INET;
120 	si = (struct sockaddr_in *) &arpreq.arp_pa;
121 	si->sin_addr = *ia;
122 
123 	/* Set up the hardware address. */
124 #ifdef	__linux__	/* XXX - Do others need this? -gwr */
125 	/*
126 	 * Linux requires the sa_family field set.
127 	 * longyear@netcom.com (Al Longyear)
128 	 */
129 	arpreq.arp_ha.sa_family = hafamily;
130 #endif	/* linux */
131 
132 	/* This variable is just to help catch type mismatches. */
133 	p = arpreq.arp_ha.sa_data;
134 	bcopy(haddr, p, halen);
135 #endif	/* WIN_TCP */
136 
137 #ifdef	SVR4
138 	/*
139 	 * And now the stuff for System V Rel 4.x which does not
140 	 * appear to allow SIOCxxx ioctls on a socket descriptor.
141 	 * Thanks to several people: (all sent the same fix)
142 	 *   Barney Wolff <barney@databus.com>,
143 	 *   bear@upsys.se (Bj|rn Sj|holm),
144 	 *   Michael Kuschke <Michael.Kuschke@Materna.DE>,
145 	 */
146 	{
147 		int fd;
148 		struct strioctl iocb;
149 
150 		if ((fd=open("/dev/arp", O_RDWR)) < 0) {
151 			report(LOG_ERR, "open /dev/arp: %s\n", get_errmsg());
152 		}
153 		iocb.ic_cmd = SIOCSARP;
154 		iocb.ic_timout = 0;
155 		iocb.ic_dp = (char *)&arpreq;
156 		iocb.ic_len = sizeof(arpreq);
157 		if (ioctl(fd, I_STR, (caddr_t)&iocb) < 0) {
158 			report(LOG_ERR, "ioctl I_STR: %s\n", get_errmsg());
159 		}
160 		close (fd);
161 	}
162 #else	/* SVR4 */
163 	/*
164 	 * On SunOS, the ioctl sometimes returns ENXIO, and it
165 	 * appears to happen when the ARP cache entry you tried
166 	 * to add is already in the cache.  (Sigh...)
167 	 * XXX - Should this error simply be ignored? -gwr
168 	 */
169 	if (ioctl(s, SIOCSARP, (caddr_t) &arpreq) < 0) {
170 		report(LOG_ERR, "ioctl SIOCSARP: %s", get_errmsg());
171 	}
172 #endif	/* SVR4 */
173 #else	/* SIOCSARP */
174 #if defined(BSD) && (BSD >= 199306)
175 	bsd_arp_set(ia, haddr, halen);
176 #else
177 	/*
178 	 * Oh well, SIOCSARP is not defined.  Just run arp(8).
179 	 * Need to delete partial entry first on some systems.
180 	 * XXX - Gag!
181 	 */
182 	int status;
183 	char buf[256];
184 	char *a;
185 	extern char *inet_ntoa();
186 
187 	a = inet_ntoa(*ia);
188 	snprintf(buf, sizeof(buf), "arp -d %s; arp -s %s %s temp",
189 			a, a, haddrtoa(haddr, halen));
190 	if (debug > 2)
191 		report(LOG_INFO, "%s", buf);
192 	status = system(buf);
193 	if (status)
194 		report(LOG_ERR, "arp failed, exit code=0x%x", status);
195 	return;
196 #endif	/* ! 4.4 BSD */
197 #endif	/* SIOCSARP */
198 }
199 
200 
201 /*
202  * Convert a hardware address to an ASCII string.
203  */
204 char *
205 haddrtoa(u_char *haddr, int hlen)
206 {
207 	static char haddrbuf[3 * MAXHADDRLEN + 1];
208 	char *bufptr;
209 
210 	if (hlen > MAXHADDRLEN)
211 		hlen = MAXHADDRLEN;
212 
213 	bufptr = haddrbuf;
214 	while (hlen > 0) {
215 		sprintf(bufptr, "%02X:", (unsigned) (*haddr++ & 0xFF));
216 		bufptr += 3;
217 		hlen--;
218 	}
219 	bufptr[-1] = 0;
220 	return (haddrbuf);
221 }
222 
223 
224 /*
225  * haddr_conv802()
226  * --------------
227  *
228  * Converts a backwards address to a canonical address and a canonical address
229  * to a backwards address.
230  *
231  * INPUTS:
232  *  adr_in - pointer to six byte string to convert (unsigned char *)
233  *  addr_len - how many bytes to convert
234  *
235  * OUTPUTS:
236  *  addr_out - The string is updated to contain the converted address.
237  *
238  * CALLER:
239  *  many
240  *
241  * DATA:
242  *  Uses conv802table to bit-reverse the address bytes.
243  */
244 
245 static u_char conv802table[256] =
246 {
247 	/* 0x00 */ 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
248 	/* 0x08 */ 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
249 	/* 0x10 */ 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
250 	/* 0x18 */ 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
251 	/* 0x20 */ 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
252 	/* 0x28 */ 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
253 	/* 0x30 */ 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
254 	/* 0x38 */ 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
255 	/* 0x40 */ 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
256 	/* 0x48 */ 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
257 	/* 0x50 */ 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
258 	/* 0x58 */ 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
259 	/* 0x60 */ 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
260 	/* 0x68 */ 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
261 	/* 0x70 */ 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
262 	/* 0x78 */ 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
263 	/* 0x80 */ 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
264 	/* 0x88 */ 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
265 	/* 0x90 */ 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
266 	/* 0x98 */ 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
267 	/* 0xA0 */ 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
268 	/* 0xA8 */ 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
269 	/* 0xB0 */ 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
270 	/* 0xB8 */ 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
271 	/* 0xC0 */ 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
272 	/* 0xC8 */ 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
273 	/* 0xD0 */ 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
274 	/* 0xD8 */ 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
275 	/* 0xE0 */ 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
276 	/* 0xE8 */ 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
277 	/* 0xF0 */ 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
278 	/* 0xF8 */ 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF,
279 };
280 
281 void
282 haddr_conv802(u_char *addr_in, u_char *addr_out, int len)
283 {
284 	u_char *lim;
285 
286 	lim = addr_out + len;
287 	while (addr_out < lim)
288 		*addr_out++ = conv802table[*addr_in++];
289 }
290 
291 #if 0
292 /*
293  * For the record, here is a program to generate the
294  * bit-reverse table above.
295  */
296 static int
297 bitrev(int n)
298 {
299 	int i, r;
300 
301 	r = 0;
302 	for (i = 0; i < 8; i++) {
303 		r <<= 1;
304 		r |= (n & 1);
305 		n >>= 1;
306 	}
307 	return r;
308 }
309 
310 void
311 main(void)
312 {
313 	int i;
314 	for (i = 0; i <= 0xFF; i++) {
315 		if ((i & 7) == 0)
316 			printf("/* 0x%02X */", i);
317 		printf(" 0x%02X,", bitrev(i));
318 		if ((i & 7) == 7)
319 			printf("\n");
320 	}
321 }
322 
323 #endif
324 
325 /*
326  * Local Variables:
327  * tab-width: 4
328  * c-indent-level: 4
329  * c-argdecl-indent: 4
330  * c-continued-statement-offset: 4
331  * c-continued-brace-offset: -4
332  * c-label-offset: -4
333  * c-brace-offset: 0
334  * End:
335  */
336