hwaddr.c revision 1.1 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 #include <net/if_arp.h>
21 #include <netinet/in.h>
22 #include <stdio.h>
23 #ifndef NO_UNISTD
24 #include <unistd.h>
25 #endif
26 #include <syslog.h>
27
28 #ifndef USE_BFUNCS
29 /* Yes, memcpy is OK here (no overlapped copies). */
30 #include <memory.h>
31 #define bcopy(a,b,c) memcpy(b,a,c)
32 #define bzero(p,l) memset(p,0,l)
33 #define bcmp(a,b,c) memcmp(a,b,c)
34 #endif
35
36 #include "bptypes.h"
37 #include "hwaddr.h"
38 #include "report.h"
39
40 extern int debug;
41
42 /*
43 * Hardware address lengths (in bytes) and network name based on hardware
44 * type code. List in order specified by Assigned Numbers RFC; Array index
45 * is hardware type code. Entries marked as zero are unknown to the author
46 * at this time. . . .
47 */
48
49 struct hwinfo hwinfolist[] =
50 {
51 {0, "Reserved"}, /* Type 0: Reserved (don't use this) */
52 {6, "Ethernet"}, /* Type 1: 10Mb Ethernet (48 bits) */
53 {1, "3Mb Ethernet"}, /* Type 2: 3Mb Ethernet (8 bits) */
54 {0, "AX.25"}, /* Type 3: Amateur Radio AX.25 */
55 {1, "ProNET"}, /* Type 4: Proteon ProNET Token Ring */
56 {0, "Chaos"}, /* Type 5: Chaos */
57 {6, "IEEE 802"}, /* Type 6: IEEE 802 Networks */
58 {0, "ARCNET"} /* Type 7: ARCNET */
59 };
60 int hwinfocnt = sizeof(hwinfolist) / sizeof(hwinfolist[0]);
61
62
63 /*
64 * Setup the arp cache so that IP address 'ia' will be temporarily
65 * bound to hardware address 'ha' of length 'len'.
66 */
67 void
68 setarp(s, ia, ha, len)
69 int s; /* socket fd */
70 struct in_addr *ia;
71 u_char *ha;
72 int len;
73 {
74 #ifdef SIOCSARP
75 struct arpreq arpreq; /* Arp request ioctl block */
76 struct sockaddr_in *si;
77 #ifdef SVR4
78 int fd;
79 struct strioctl iocb;
80 #endif /* SVR4 */
81
82 bzero((caddr_t) & arpreq, sizeof(arpreq));
83 arpreq.arp_flags = ATF_INUSE | ATF_COM;
84
85 /* Set up the protocol address. */
86 arpreq.arp_pa.sa_family = AF_INET;
87 si = (struct sockaddr_in *) &arpreq.arp_pa;
88 si->sin_addr = *ia;
89
90 /* Set up the hardware address. */
91 bcopy(ha, arpreq.arp_ha.sa_data, len);
92
93 #ifdef SVR4
94 /*
95 * And now the stuff for System V Rel 4.x which does not
96 * appear to allow SIOCxxx ioctls on a socket descriptor.
97 * Thanks to several people: (all sent the same fix)
98 * Barney Wolff <barney (at) databus.com>,
99 * bear (at) upsys.se (Bj|rn Sj|holm),
100 * Michael Kuschke <Michael.Kuschke (at) Materna.DE>,
101 */
102 if ((fd=open("/dev/arp", O_RDWR)) < 0) {
103 report(LOG_ERR, "open /dev/arp: %s\n", get_errmsg());
104 }
105 iocb.ic_cmd = SIOCSARP;
106 iocb.ic_timout = 0;
107 iocb.ic_dp = (char *)&arpreq;
108 iocb.ic_len = sizeof(arpreq);
109 if (ioctl(fd, I_STR, (caddr_t)&iocb) < 0) {
110 report(LOG_ERR, "ioctl I_STR: %s\n", get_errmsg());
111 }
112 close (fd);
113
114 #else /* SVR4 */
115 /*
116 * On SunOS, the ioctl sometimes returns ENXIO, and it
117 * appears to happen when the ARP cache entry you tried
118 * to add is already in the cache. (Sigh...)
119 * XXX - Should this error simply be ignored? -gwr
120 */
121 if (ioctl(s, SIOCSARP, (caddr_t) & arpreq) < 0) {
122 report(LOG_ERR, "ioctl SIOCSARP: %s", get_errmsg());
123 }
124 #endif /* SVR4 */
125 #else /* SIOCSARP */
126 /*
127 * Oh well, SIOCSARP is not defined. Just run arp(8).
128 * XXX - Gag!
129 */
130 char buf[256];
131 int status;
132
133 sprintf(buf, "arp -s %s %s temp",
134 inet_ntoa(*ia), haddrtoa(ha, len));
135 if (debug > 2)
136 report(LOG_INFO, buf);
137 status = system(buf);
138 if (status)
139 report(LOG_ERR, "arp failed, exit code=0x%x", status);
140 return;
141 #endif /* SIOCSARP */
142 }
143
144
145 /*
146 * Convert a hardware address to an ASCII string.
147 */
148 char *
149 haddrtoa(haddr, hlen)
150 u_char *haddr;
151 int hlen;
152 {
153 static char haddrbuf[3 * MAXHADDRLEN + 1];
154 char *bufptr;
155
156 if (hlen > MAXHADDRLEN)
157 hlen = MAXHADDRLEN;
158
159 bufptr = haddrbuf;
160 while (hlen > 0) {
161 sprintf(bufptr, "%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
228 haddr_conv802(addr_in, addr_out, len)
229 register u_char *addr_in, *addr_out;
230 int len;
231 {
232 u_char *lim;
233
234 lim = addr_out + len;
235 while (addr_out < lim)
236 *addr_out++ = conv802table[*addr_in++];
237 }
238
239 #if 0
240 /*
241 * For the record, here is a program to generate the
242 * bit-reverse table above.
243 */
244 static int
245 bitrev(n)
246 int n;
247 {
248 int i, r;
249
250 r = 0;
251 for (i = 0; i < 8; i++) {
252 r <<= 1;
253 r |= (n & 1);
254 n >>= 1;
255 }
256 return r;
257 }
258
259 main()
260 {
261 int i;
262 for (i = 0; i <= 0xFF; i++) {
263 if ((i & 7) == 0)
264 printf("/* 0x%02X */", i);
265 printf(" 0x%02X,", bitrev(i));
266 if ((i & 7) == 7)
267 printf("\n");
268 }
269 }
270
271 #endif
272
273 /*
274 * Local Variables:
275 * tab-width: 4
276 * c-indent-level: 4
277 * c-argdecl-indent: 4
278 * c-continued-statement-offset: 4
279 * c-continued-brace-offset: -4
280 * c-label-offset: -4
281 * c-brace-offset: 0
282 * End:
283 */
284