1 /* 2 * hwaddr.c - routines that deal with hardware addresses. 3 * (i.e. Ethernet) 4 * 5 * $FreeBSD: src/libexec/bootpd/hwaddr.c,v 1.7.2.1 2003/02/15 05:36:01 kris Exp $ 6 * $DragonFly: src/libexec/bootpd/hwaddr.c,v 1.3 2003/11/14 03:54:29 dillon Exp $ 7 */ 8 9 #include <sys/types.h> 10 #include <sys/param.h> 11 #include <sys/socket.h> 12 #include <sys/ioctl.h> 13 14 #if defined(SUNOS) || defined(SVR4) 15 #include <sys/sockio.h> 16 #endif 17 #ifdef SVR4 18 #include <sys/stream.h> 19 #include <stropts.h> 20 #include <fcntl.h> 21 #endif 22 23 #ifdef _AIX32 24 #include <sys/time.h> /* for struct timeval in net/if.h */ 25 #include <net/if.h> /* for struct ifnet in net/if_arp.h */ 26 #endif 27 28 #include <net/if_arp.h> 29 #include <netinet/in.h> 30 31 #ifdef WIN_TCP 32 #include <netinet/if_ether.h> 33 #include <sys/dlpi.h> 34 #endif 35 36 #include <stdio.h> 37 #ifndef NO_UNISTD 38 #include <unistd.h> 39 #endif 40 #include <syslog.h> 41 42 #ifndef USE_BFUNCS 43 /* Yes, memcpy is OK here (no overlapped copies). */ 44 #include <memory.h> 45 #define bcopy(a,b,c) memcpy(b,a,c) 46 #define bzero(p,l) memset(p,0,l) 47 #define bcmp(a,b,c) memcmp(a,b,c) 48 #endif 49 50 #ifndef ATF_INUSE /* Not defined on some systems (i.e. Linux) */ 51 #define ATF_INUSE 0 52 #endif 53 54 /* For BSD 4.4, set arp entry by writing to routing socket */ 55 #if defined(BSD) 56 #if BSD >= 199306 57 extern int bsd_arp_set (struct in_addr *, char *, int); 58 #endif 59 #endif 60 61 #include "bptypes.h" 62 #include "hwaddr.h" 63 #include "report.h" 64 65 extern int debug; 66 67 /* 68 * Hardware address lengths (in bytes) and network name based on hardware 69 * type code. List in order specified by Assigned Numbers RFC; Array index 70 * is hardware type code. Entries marked as zero are unknown to the author 71 * at this time. . . . 72 */ 73 74 struct hwinfo hwinfolist[] = 75 { 76 {0, "Reserved"}, /* Type 0: Reserved (don't use this) */ 77 {6, "Ethernet"}, /* Type 1: 10Mb Ethernet (48 bits) */ 78 {1, "3Mb Ethernet"}, /* Type 2: 3Mb Ethernet (8 bits) */ 79 {0, "AX.25"}, /* Type 3: Amateur Radio AX.25 */ 80 {1, "ProNET"}, /* Type 4: Proteon ProNET Token Ring */ 81 {0, "Chaos"}, /* Type 5: Chaos */ 82 {6, "IEEE 802"}, /* Type 6: IEEE 802 Networks */ 83 {0, "ARCNET"} /* Type 7: ARCNET */ 84 }; 85 int hwinfocnt = sizeof(hwinfolist) / sizeof(hwinfolist[0]); 86 87 88 /* 89 * Setup the arp cache so that IP address 'ia' will be temporarily 90 * bound to hardware address 'ha' of length 'len'. 91 */ 92 void 93 setarp(s, ia, hafamily, haddr, halen) 94 int s; /* socket fd */ 95 struct in_addr *ia; /* protocol address */ 96 int hafamily; /* HW address family */ 97 u_char *haddr; /* HW address data */ 98 int halen; 99 { 100 #ifdef SIOCSARP 101 #ifdef WIN_TCP 102 /* This is an SVR4 with different networking code from 103 * Wollongong WIN-TCP. Not quite like the Lachman code. 104 * Code from: drew@drewsun.FEITH.COM (Andrew B. Sudell) 105 */ 106 #undef SIOCSARP 107 #define SIOCSARP ARP_ADD 108 struct arptab arpreq; /* Arp table entry */ 109 110 bzero((caddr_t) &arpreq, sizeof(arpreq)); 111 arpreq.at_flags = ATF_COM; 112 113 /* Set up IP address */ 114 arpreq.at_in = ia->s_addr; 115 116 /* Set up Hardware Address */ 117 bcopy(haddr, arpreq.at_enaddr, halen); 118 119 /* Set the Date Link type. */ 120 /* XXX - Translate (hafamily) to dltype somehow? */ 121 arpreq.at_dltype = DL_ETHER; 122 123 #else /* WIN_TCP */ 124 /* Good old Berkeley way. */ 125 struct arpreq arpreq; /* Arp request ioctl block */ 126 struct sockaddr_in *si; 127 char *p; 128 129 bzero((caddr_t) &arpreq, sizeof(arpreq)); 130 arpreq.arp_flags = ATF_INUSE | ATF_COM; 131 132 /* Set up the protocol address. */ 133 arpreq.arp_pa.sa_family = AF_INET; 134 si = (struct sockaddr_in *) &arpreq.arp_pa; 135 si->sin_addr = *ia; 136 137 /* Set up the hardware address. */ 138 #ifdef __linux__ /* XXX - Do others need this? -gwr */ 139 /* 140 * Linux requires the sa_family field set. 141 * longyear@netcom.com (Al Longyear) 142 */ 143 arpreq.arp_ha.sa_family = hafamily; 144 #endif /* linux */ 145 146 /* This variable is just to help catch type mismatches. */ 147 p = arpreq.arp_ha.sa_data; 148 bcopy(haddr, p, halen); 149 #endif /* WIN_TCP */ 150 151 #ifdef SVR4 152 /* 153 * And now the stuff for System V Rel 4.x which does not 154 * appear to allow SIOCxxx ioctls on a socket descriptor. 155 * Thanks to several people: (all sent the same fix) 156 * Barney Wolff <barney@databus.com>, 157 * bear@upsys.se (Bj|rn Sj|holm), 158 * Michael Kuschke <Michael.Kuschke@Materna.DE>, 159 */ 160 { 161 int fd; 162 struct strioctl iocb; 163 164 if ((fd=open("/dev/arp", O_RDWR)) < 0) { 165 report(LOG_ERR, "open /dev/arp: %s\n", get_errmsg()); 166 } 167 iocb.ic_cmd = SIOCSARP; 168 iocb.ic_timout = 0; 169 iocb.ic_dp = (char *)&arpreq; 170 iocb.ic_len = sizeof(arpreq); 171 if (ioctl(fd, I_STR, (caddr_t)&iocb) < 0) { 172 report(LOG_ERR, "ioctl I_STR: %s\n", get_errmsg()); 173 } 174 close (fd); 175 } 176 #else /* SVR4 */ 177 /* 178 * On SunOS, the ioctl sometimes returns ENXIO, and it 179 * appears to happen when the ARP cache entry you tried 180 * to add is already in the cache. (Sigh...) 181 * XXX - Should this error simply be ignored? -gwr 182 */ 183 if (ioctl(s, SIOCSARP, (caddr_t) &arpreq) < 0) { 184 report(LOG_ERR, "ioctl SIOCSARP: %s", get_errmsg()); 185 } 186 #endif /* SVR4 */ 187 #else /* SIOCSARP */ 188 #if defined(BSD) && (BSD >= 199306) 189 bsd_arp_set(ia, haddr, halen); 190 #else 191 /* 192 * Oh well, SIOCSARP is not defined. Just run arp(8). 193 * Need to delete partial entry first on some systems. 194 * XXX - Gag! 195 */ 196 int status; 197 char buf[256]; 198 char *a; 199 extern char *inet_ntoa(); 200 201 a = inet_ntoa(*ia); 202 snprintf(buf, sizeof(buf), "arp -d %s; arp -s %s %s temp", 203 a, a, haddrtoa(haddr, halen)); 204 if (debug > 2) 205 report(LOG_INFO, "%s", buf); 206 status = system(buf); 207 if (status) 208 report(LOG_ERR, "arp failed, exit code=0x%x", status); 209 return; 210 #endif /* ! 4.4 BSD */ 211 #endif /* SIOCSARP */ 212 } 213 214 215 /* 216 * Convert a hardware address to an ASCII string. 217 */ 218 char * 219 haddrtoa(haddr, hlen) 220 u_char *haddr; 221 int hlen; 222 { 223 static char haddrbuf[3 * MAXHADDRLEN + 1]; 224 char *bufptr; 225 226 if (hlen > MAXHADDRLEN) 227 hlen = MAXHADDRLEN; 228 229 bufptr = haddrbuf; 230 while (hlen > 0) { 231 sprintf(bufptr, "%02X:", (unsigned) (*haddr++ & 0xFF)); 232 bufptr += 3; 233 hlen--; 234 } 235 bufptr[-1] = 0; 236 return (haddrbuf); 237 } 238 239 240 /* 241 * haddr_conv802() 242 * -------------- 243 * 244 * Converts a backwards address to a canonical address and a canonical address 245 * to a backwards address. 246 * 247 * INPUTS: 248 * adr_in - pointer to six byte string to convert (unsigned char *) 249 * addr_len - how many bytes to convert 250 * 251 * OUTPUTS: 252 * addr_out - The string is updated to contain the converted address. 253 * 254 * CALLER: 255 * many 256 * 257 * DATA: 258 * Uses conv802table to bit-reverse the address bytes. 259 */ 260 261 static u_char conv802table[256] = 262 { 263 /* 0x00 */ 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 264 /* 0x08 */ 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, 265 /* 0x10 */ 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, 266 /* 0x18 */ 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, 267 /* 0x20 */ 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 268 /* 0x28 */ 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, 269 /* 0x30 */ 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 270 /* 0x38 */ 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, 271 /* 0x40 */ 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 272 /* 0x48 */ 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, 273 /* 0x50 */ 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 274 /* 0x58 */ 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, 275 /* 0x60 */ 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 276 /* 0x68 */ 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, 277 /* 0x70 */ 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 278 /* 0x78 */ 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, 279 /* 0x80 */ 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 280 /* 0x88 */ 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, 281 /* 0x90 */ 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 282 /* 0x98 */ 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, 283 /* 0xA0 */ 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 284 /* 0xA8 */ 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, 285 /* 0xB0 */ 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 286 /* 0xB8 */ 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, 287 /* 0xC0 */ 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 288 /* 0xC8 */ 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, 289 /* 0xD0 */ 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 290 /* 0xD8 */ 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, 291 /* 0xE0 */ 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 292 /* 0xE8 */ 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, 293 /* 0xF0 */ 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 294 /* 0xF8 */ 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF, 295 }; 296 297 void 298 haddr_conv802(addr_in, addr_out, len) 299 register u_char *addr_in, *addr_out; 300 int len; 301 { 302 u_char *lim; 303 304 lim = addr_out + len; 305 while (addr_out < lim) 306 *addr_out++ = conv802table[*addr_in++]; 307 } 308 309 #if 0 310 /* 311 * For the record, here is a program to generate the 312 * bit-reverse table above. 313 */ 314 static int 315 bitrev(n) 316 int n; 317 { 318 int i, r; 319 320 r = 0; 321 for (i = 0; i < 8; i++) { 322 r <<= 1; 323 r |= (n & 1); 324 n >>= 1; 325 } 326 return r; 327 } 328 329 main() 330 { 331 int i; 332 for (i = 0; i <= 0xFF; i++) { 333 if ((i & 7) == 0) 334 printf("/* 0x%02X */", i); 335 printf(" 0x%02X,", bitrev(i)); 336 if ((i & 7) == 7) 337 printf("\n"); 338 } 339 } 340 341 #endif 342 343 /* 344 * Local Variables: 345 * tab-width: 4 346 * c-indent-level: 4 347 * c-argdecl-indent: 4 348 * c-continued-statement-offset: 4 349 * c-continued-brace-offset: -4 350 * c-label-offset: -4 351 * c-brace-offset: 0 352 * End: 353 */ 354