281 lines
7.1 KiB
C
281 lines
7.1 KiB
C
/* $NetBSD: hwaddr.c,v 1.10 2009/04/15 00:23:29 lukem Exp $ */
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: hwaddr.c,v 1.10 2009/04/15 00:23:29 lukem Exp $");
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#endif
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/*
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* hwaddr.c - routines that deal with hardware addresses.
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* (i.e. Ethernet)
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#if defined(SUNOS) || defined(SVR4)
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#include <sys/sockio.h>
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#endif
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#ifdef SVR4
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#include <sys/stream.h>
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#include <stropts.h>
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#include <fcntl.h>
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#endif
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#include <net/if_arp.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <strings.h>
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#ifndef NO_UNISTD
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#include <unistd.h>
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#endif
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#include <syslog.h>
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#include <arpa/inet.h>
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#include "bptypes.h"
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#include "hwaddr.h"
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#include "report.h"
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extern int debug;
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/*
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* Hardware address lengths (in bytes) and network name based on hardware
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* type code. List in order specified by Assigned Numbers RFC; Array index
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* is hardware type code. Entries marked as zero are unknown to the author
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* at this time. . . .
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*/
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struct hwinfo hwinfolist[] =
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{
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{0, "Reserved"}, /* Type 0: Reserved (don't use this) */
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{6, "Ethernet"}, /* Type 1: 10Mb Ethernet (48 bits) */
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{1, "3Mb Ethernet"}, /* Type 2: 3Mb Ethernet (8 bits) */
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{0, "AX.25"}, /* Type 3: Amateur Radio AX.25 */
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{1, "ProNET"}, /* Type 4: Proteon ProNET Token Ring */
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{0, "Chaos"}, /* Type 5: Chaos */
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{6, "IEEE 802"}, /* Type 6: IEEE 802 Networks */
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{0, "ARCNET"} /* Type 7: ARCNET */
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};
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size_t hwinfocnt = sizeof(hwinfolist) / sizeof(hwinfolist[0]);
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/*
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* Setup the arp cache so that IP address 'ia' will be temporarily
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* bound to hardware address 'ha' of length 'len'.
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* s is the socket fd.
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*/
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void
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setarp(int s, struct in_addr *ia, u_char *ha, int len)
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{
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#ifdef SIOCSARP
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struct arpreq arpreq; /* Arp request ioctl block */
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struct sockaddr_in *si;
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#ifdef SVR4
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int fd;
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struct strioctl iocb;
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#endif /* SVR4 */
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bzero((caddr_t) & arpreq, sizeof(arpreq));
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arpreq.arp_flags = ATF_INUSE | ATF_COM;
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/* Set up the protocol address. */
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arpreq.arp_pa.sa_family = AF_INET;
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si = (struct sockaddr_in *) &arpreq.arp_pa;
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si->sin_addr = *ia;
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/* Set up the hardware address. */
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bcopy(ha, arpreq.arp_ha.sa_data, len);
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#ifdef SVR4
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/*
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* And now the stuff for System V Rel 4.x which does not
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* appear to allow SIOCxxx ioctls on a socket descriptor.
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* Thanks to several people: (all sent the same fix)
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* Barney Wolff <barney@databus.com>,
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* bear@upsys.se (Bj|rn Sj|holm),
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* Michael Kuschke <Michael.Kuschke@Materna.DE>,
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*/
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if ((fd=open("/dev/arp", O_RDWR)) < 0) {
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report(LOG_ERR, "open /dev/arp: %s\n", get_errmsg());
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}
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iocb.ic_cmd = SIOCSARP;
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iocb.ic_timout = 0;
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iocb.ic_dp = (char *)&arpreq;
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iocb.ic_len = sizeof(arpreq);
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if (ioctl(fd, I_STR, (caddr_t)&iocb) < 0) {
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report(LOG_ERR, "ioctl I_STR: %s\n", get_errmsg());
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}
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close (fd);
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#else /* SVR4 */
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/*
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* On SunOS, the ioctl sometimes returns ENXIO, and it
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* appears to happen when the ARP cache entry you tried
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* to add is already in the cache. (Sigh...)
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* XXX - Should this error simply be ignored? -gwr
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*/
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if (ioctl(s, SIOCSARP, (caddr_t) & arpreq) < 0) {
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report(LOG_ERR, "ioctl SIOCSARP: %s", get_errmsg());
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}
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#endif /* SVR4 */
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#else /* SIOCSARP */
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/*
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* Oh well, SIOCSARP is not defined. Just run arp(8).
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* XXX - Gag!
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*/
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int status;
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char buf[256];
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char *a;
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a = inet_ntoa(*ia);
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snprintf(buf, sizeof(buf), "arp -d %s; arp -s %s %s temp",
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a, a, haddrtoa(ha, len));
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if (debug > 2)
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report(LOG_INFO, "%s", buf);
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status = system(buf);
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if (status)
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report(LOG_ERR, "arp failed, exit code=0x%x", status);
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return;
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#endif /* SIOCSARP */
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}
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/*
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* Convert a hardware address to an ASCII string.
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*/
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char *
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haddrtoa(u_char *haddr, int hlen)
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{
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static char haddrbuf[3 * MAXHADDRLEN + 1];
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char *bufptr;
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if (hlen > MAXHADDRLEN)
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hlen = MAXHADDRLEN;
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bufptr = haddrbuf;
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while (hlen > 0) {
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snprintf(bufptr, sizeof(haddrbuf) - (bufptr - haddrbuf),
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"%02X:", (unsigned) (*haddr++ & 0xFF));
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bufptr += 3;
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hlen--;
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}
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bufptr[-1] = 0;
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return (haddrbuf);
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}
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/*
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* haddr_conv802()
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* --------------
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*
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* Converts a backwards address to a canonical address and a canonical address
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* to a backwards address.
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*
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* INPUTS:
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* adr_in - pointer to six byte string to convert (unsigned char *)
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* addr_len - how many bytes to convert
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*
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* OUTPUTS:
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* addr_out - The string is updated to contain the converted address.
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*
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* CALLER:
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* many
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*
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* DATA:
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* Uses conv802table to bit-reverse the address bytes.
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*/
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static u_char conv802table[256] =
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{
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/* 0x00 */ 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,
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/* 0x08 */ 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,
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/* 0x10 */ 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,
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/* 0x18 */ 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,
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/* 0x20 */ 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,
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/* 0x28 */ 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,
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/* 0x30 */ 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,
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/* 0x38 */ 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,
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/* 0x40 */ 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,
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/* 0x48 */ 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,
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/* 0x50 */ 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,
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/* 0x58 */ 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,
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/* 0x60 */ 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,
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/* 0x68 */ 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,
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/* 0x70 */ 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,
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/* 0x78 */ 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,
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/* 0x80 */ 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,
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/* 0x88 */ 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,
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/* 0x90 */ 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,
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/* 0x98 */ 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,
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/* 0xA0 */ 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,
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/* 0xA8 */ 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,
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/* 0xB0 */ 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,
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/* 0xB8 */ 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,
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/* 0xC0 */ 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,
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/* 0xC8 */ 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,
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/* 0xD0 */ 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,
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/* 0xD8 */ 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,
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/* 0xE0 */ 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,
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/* 0xE8 */ 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,
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/* 0xF0 */ 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,
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/* 0xF8 */ 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF,
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};
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void
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haddr_conv802(u_char *addr_in, u_char *addr_out, int len)
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{
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u_char *lim;
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lim = addr_out + len;
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while (addr_out < lim)
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*addr_out++ = conv802table[*addr_in++];
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}
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#if 0
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/*
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* For the record, here is a program to generate the
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* bit-reverse table above.
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*/
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static int
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bitrev(int n)
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{
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int i, r;
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r = 0;
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for (i = 0; i < 8; i++) {
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r <<= 1;
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r |= (n & 1);
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n >>= 1;
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}
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return r;
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}
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main(void)
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{
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int i;
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for (i = 0; i <= 0xFF; i++) {
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if ((i & 7) == 0)
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printf("/* 0x%02X */", i);
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printf(" 0x%02X,", bitrev(i));
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if ((i & 7) == 7)
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printf("\n");
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}
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}
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#endif
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/*
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* Local Variables:
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* tab-width: 4
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* c-indent-level: 4
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* c-argdecl-indent: 4
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* c-continued-statement-offset: 4
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* c-continued-brace-offset: -4
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* c-label-offset: -4
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* c-brace-offset: 0
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* End:
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*/
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