1 /* $NetBSD: hwaddr.c,v 1.10 2009/04/15 00:23:29 lukem Exp $ */
2
3 #include <sys/cdefs.h>
4 #ifndef lint
5 __RCSID("$NetBSD: hwaddr.c,v 1.10 2009/04/15 00:23:29 lukem 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
42 extern 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
51 struct 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 };
62 size_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 */
70 void
setarp(int s,struct in_addr * ia,u_char * ha,int len)71 setarp(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 */
149 char *
haddrtoa(u_char * haddr,int hlen)150 haddrtoa(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
191 static 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
227 void
haddr_conv802(u_char * addr_in,u_char * addr_out,int len)228 haddr_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 */
242 static int
243 bitrev(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
256 main(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