mirror of
https://github.com/rsmarples/dhcpcd.git
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121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)linkaddr.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <net/if_dl.h>
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#include <string.h>
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/* States*/
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#define NAMING 0
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#define GOTONE 1
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#define GOTTWO 2
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#define RESET 3
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/* Inputs */
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#define DIGIT (4*0)
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#define END (4*1)
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#define DELIM (4*2)
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#define LETTER (4*3)
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void
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link_addr(addr, sdl)
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const char *addr;
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struct sockaddr_dl *sdl;
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{
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char *cp = sdl->sdl_data;
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char *cplim = sdl->sdl_len + (char *)(void *)sdl;
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int byte = 0, state = NAMING;
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int newaddr = 0;
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(void)memset(&sdl->sdl_family, 0, (size_t)sdl->sdl_len - 1);
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sdl->sdl_family = AF_LINK;
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do {
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state &= ~LETTER;
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if ((*addr >= '0') && (*addr <= '9')) {
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newaddr = *addr - '0';
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} else if ((*addr >= 'a') && (*addr <= 'f')) {
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newaddr = *addr - 'a' + 10;
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} else if ((*addr >= 'A') && (*addr <= 'F')) {
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newaddr = *addr - 'A' + 10;
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} else if (*addr == 0) {
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state |= END;
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} else if (state == NAMING &&
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(((*addr >= 'A') && (*addr <= 'Z')) ||
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((*addr >= 'a') && (*addr <= 'z'))))
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state |= LETTER;
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else
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state |= DELIM;
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addr++;
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switch (state /* | INPUT */) {
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case NAMING | DIGIT:
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case NAMING | LETTER:
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*cp++ = addr[-1];
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continue;
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case NAMING | DELIM:
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state = RESET;
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sdl->sdl_nlen = cp - sdl->sdl_data;
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continue;
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case GOTTWO | DIGIT:
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*cp++ = byte;
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/* FALLTHROUGH */
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case RESET | DIGIT:
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state = GOTONE;
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byte = newaddr;
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continue;
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case GOTONE | DIGIT:
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state = GOTTWO;
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byte = newaddr + (byte << 4);
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continue;
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default: /* | DELIM */
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state = RESET;
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*cp++ = byte;
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byte = 0;
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continue;
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case GOTONE | END:
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case GOTTWO | END:
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*cp++ = byte;
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/* FALLTHROUGH */
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case RESET | END:
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break;
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}
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break;
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} while (cp < cplim);
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sdl->sdl_alen = cp - LLADDR(sdl);
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newaddr = cp - (char *)(void *)sdl;
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if ((size_t) newaddr > sizeof(*sdl))
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sdl->sdl_len = newaddr;
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return;
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}
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