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