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
46 extern 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
54 extern 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
63 struct 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 };
74 int 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 */
81 void
setarp(int s,struct in_addr * ia,int hafamily,u_char * haddr,int halen)82 setarp(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 */
202 char *
haddrtoa(u_char * haddr,int hlen)203 haddrtoa(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
243 static 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
279 void
haddr_conv802(u_char * addr_in,u_char * addr_out,int len)280 haddr_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 */
294 static int
295 bitrev(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
308 void
309 main(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