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