usr.sbin/bootp/common/hwaddr.c

   1 /*      $NetBSD: hwaddr.c,v 1.9 2007/05/27 16:31:42 tls Exp $   */
   2
   3 #include <sys/cdefs.h>
   4 #ifndef lint
   5 __RCSID("$NetBSD: hwaddr.c,v 1.9 2007/05/27 16:31:42 tls 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@databus.com>,
  98          *   bear@upsys.se (Bj|rn Sj|holm),
  99          *   Michael Kuschke <Michael.Kuschke@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  */