mirror of
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71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*
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* dhcpcd - DHCP client daemon
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* Copyright 2006-2008 Roy Marples <roy@marples.name>
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* All rights reserved
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <errno.h>
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#include <stdlib.h>
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#include "config.h"
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#include "arp.h"
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#include "ipv4ll.h"
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#ifdef ENABLE_IPV4LL
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#ifndef ENABLE_ARP
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# error IPV4LL requires ARP
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#endif
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#define IPV4LL_LEASETIME 20
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int ipv4ll_get_address (interface_t *iface, dhcp_t *dhcp) {
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struct in_addr addr;
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for (;;) {
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addr.s_addr = htonl (LINKLOCAL_ADDR |
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(((uint32_t) abs ((int) random ())
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% 0xFD00) + 0x0100));
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errno = 0;
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if (! arp_claim (iface, addr))
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break;
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/* Our ARP may have been interrupted */
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if (errno)
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return (-1);
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}
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dhcp->address.s_addr = addr.s_addr;
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dhcp->netmask.s_addr = htonl (LINKLOCAL_MASK);
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dhcp->broadcast.s_addr = htonl (LINKLOCAL_BRDC);
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/* Finally configure some DHCP like lease times */
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dhcp->leasetime = IPV4LL_LEASETIME;
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dhcp->renewaltime = (dhcp->leasetime * 0.5);
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dhcp->rebindtime = (dhcp->leasetime * 0.875);
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return (0);
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}
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#endif
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