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 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 (at) databus.com>, 98 * bear (at) upsys.se (Bj|rn Sj|holm), 99 * Michael Kuschke <Michael.Kuschke (at) 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 * 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 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
Indexes created Sat Sep 20 22:09:52 GMT 2025