2 * hwaddr.c - routines that deal with hardware addresses.
10 #include <sys/socket.h>
11 #include <sys/ioctl.h>
13 #if defined(SUNOS) || defined(SVR4)
14 #include <sys/sockio.h>
17 #include <sys/stream.h>
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 */
27 #include <net/if_arp.h>
28 #include <netinet/in.h>
31 #include <netinet/if_ether.h>
41 #ifndef ATF_INUSE /* Not defined on some systems (i.e. Linux) */
45 /* For BSD 4.4, set arp entry by writing to routing socket */
48 extern int bsd_arp_set(struct in_addr *, char *, int);
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
65 struct hwinfo hwinfolist[] =
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 */
76 int hwinfocnt = sizeof(hwinfolist) / sizeof(hwinfolist[0]);
80 * Setup the arp cache so that IP address 'ia' will be temporarily
81 * bound to hardware address 'ha' of length 'len'.
84 setarp(s, ia, hafamily, haddr, halen)
85 int s; /* socket fd */
86 struct in_addr *ia; /* protocol address */
87 int hafamily; /* HW address family */
88 u_char *haddr; /* HW address data */
93 /* This is an SVR4 with different networking code from
94 * Wollongong WIN-TCP. Not quite like the Lachman code.
95 * Code from: drew@drewsun.FEITH.COM (Andrew B. Sudell)
98 #define SIOCSARP ARP_ADD
99 struct arptab arpreq; /* Arp table entry */
101 bzero((caddr_t) &arpreq, sizeof(arpreq));
102 arpreq.at_flags = ATF_COM;
104 /* Set up IP address */
105 arpreq.at_in = ia->s_addr;
107 /* Set up Hardware Address */
108 bcopy(haddr, arpreq.at_enaddr, halen);
110 /* Set the Date Link type. */
111 /* XXX - Translate (hafamily) to dltype somehow? */
112 arpreq.at_dltype = DL_ETHER;
115 /* Good old Berkeley way. */
116 struct arpreq arpreq; /* Arp request ioctl block */
117 struct sockaddr_in *si;
120 bzero((caddr_t) &arpreq, sizeof(arpreq));
121 arpreq.arp_flags = ATF_INUSE | ATF_COM;
123 /* Set up the protocol address. */
124 arpreq.arp_pa.sa_family = AF_INET;
125 si = (struct sockaddr_in *) &arpreq.arp_pa;
128 /* Set up the hardware address. */
129 #ifdef __linux__ /* XXX - Do others need this? -gwr */
131 * Linux requires the sa_family field set.
132 * longyear@netcom.com (Al Longyear)
134 arpreq.arp_ha.sa_family = hafamily;
137 /* This variable is just to help catch type mismatches. */
138 p = arpreq.arp_ha.sa_data;
139 bcopy(haddr, p, halen);
144 * And now the stuff for System V Rel 4.x which does not
145 * appear to allow SIOCxxx ioctls on a socket descriptor.
146 * Thanks to several people: (all sent the same fix)
147 * Barney Wolff <barney@databus.com>,
148 * bear@upsys.se (Bj|rn Sj|holm),
149 * Michael Kuschke <Michael.Kuschke@Materna.DE>,
153 struct strioctl iocb;
155 if ((fd=open("/dev/arp", O_RDWR)) < 0) {
156 report(LOG_ERR, "open /dev/arp: %s\n", get_errmsg());
158 iocb.ic_cmd = SIOCSARP;
160 iocb.ic_dp = (char *)&arpreq;
161 iocb.ic_len = sizeof(arpreq);
162 if (ioctl(fd, I_STR, (caddr_t)&iocb) < 0) {
163 report(LOG_ERR, "ioctl I_STR: %s\n", get_errmsg());
169 * On SunOS, the ioctl sometimes returns ENXIO, and it
170 * appears to happen when the ARP cache entry you tried
171 * to add is already in the cache. (Sigh...)
172 * XXX - Should this error simply be ignored? -gwr
174 if (ioctl(s, SIOCSARP, (caddr_t) &arpreq) < 0) {
175 report(LOG_ERR, "ioctl SIOCSARP: %s", get_errmsg());
179 #if defined(BSD) && (BSD >= 199306)
180 bsd_arp_set(ia, haddr, halen);
183 * Oh well, SIOCSARP is not defined. Just run arp(8).
184 * Need to delete partial entry first on some systems.
190 extern char *inet_ntoa();
193 snprintf(buf, sizeof(buf), "arp -d %s; arp -s %s %s temp",
194 a, a, haddrtoa(haddr, halen));
196 report(LOG_INFO, "%s", buf);
197 status = system(buf);
199 report(LOG_ERR, "arp failed, exit code=0x%x", status);
201 #endif /* ! 4.4 BSD */
202 #endif /* SIOCSARP */
207 * Convert a hardware address to an ASCII string.
210 haddrtoa(haddr, hlen)
214 static char haddrbuf[3 * MAXHADDRLEN + 1];
217 if (hlen > MAXHADDRLEN)
222 sprintf(bufptr, "%02X:", (unsigned) (*haddr++ & 0xFF));
235 * Converts a backwards address to a canonical address and a canonical address
236 * to a backwards address.
239 * adr_in - pointer to six byte string to convert (unsigned char *)
240 * addr_len - how many bytes to convert
243 * addr_out - The string is updated to contain the converted address.
249 * Uses conv802table to bit-reverse the address bytes.
252 static u_char conv802table[256] =
254 /* 0x00 */ 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
255 /* 0x08 */ 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
256 /* 0x10 */ 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
257 /* 0x18 */ 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
258 /* 0x20 */ 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
259 /* 0x28 */ 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
260 /* 0x30 */ 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
261 /* 0x38 */ 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
262 /* 0x40 */ 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
263 /* 0x48 */ 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
264 /* 0x50 */ 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
265 /* 0x58 */ 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
266 /* 0x60 */ 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
267 /* 0x68 */ 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
268 /* 0x70 */ 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
269 /* 0x78 */ 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
270 /* 0x80 */ 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
271 /* 0x88 */ 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
272 /* 0x90 */ 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
273 /* 0x98 */ 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
274 /* 0xA0 */ 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
275 /* 0xA8 */ 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
276 /* 0xB0 */ 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
277 /* 0xB8 */ 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
278 /* 0xC0 */ 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
279 /* 0xC8 */ 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
280 /* 0xD0 */ 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
281 /* 0xD8 */ 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
282 /* 0xE0 */ 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
283 /* 0xE8 */ 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
284 /* 0xF0 */ 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
285 /* 0xF8 */ 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF,
289 haddr_conv802(addr_in, addr_out, len)
290 u_char *addr_in, *addr_out;
295 lim = addr_out + len;
296 while (addr_out < lim)
297 *addr_out++ = conv802table[*addr_in++];
302 * For the record, here is a program to generate the
303 * bit-reverse table above.
312 for (i = 0; i < 8; i++) {
323 for (i = 0; i <= 0xFF; i++) {
325 printf("/* 0x%02X */", i);
326 printf(" 0x%02X,", bitrev(i));
338 * c-argdecl-indent: 4
339 * c-continued-statement-offset: 4
340 * c-continued-brace-offset: -4