libexec/bootpd/hwaddr.c

   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  */