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60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* clientsocket.c -- DHCP client socket creation
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*
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* udhcp client
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*
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* Russ Dill <Russ.Dill@asu.edu> July 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <features.h>
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#if (__GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined(_NEWLIB_VERSION)
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#include <netpacket/packet.h>
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#include <net/ethernet.h>
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#else
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#include <asm/types.h>
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#include <linux/if_packet.h>
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#include <linux/if_ether.h>
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#endif
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#include "common.h"
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int raw_socket(int ifindex)
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{
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int fd;
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struct sockaddr_ll sock;
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DEBUG("Opening raw socket on ifindex %d", ifindex);
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fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
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if (fd < 0) {
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bb_perror_msg("socket");
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return -1;
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}
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sock.sll_family = AF_PACKET;
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sock.sll_protocol = htons(ETH_P_IP);
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sock.sll_ifindex = ifindex;
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if (bind(fd, (struct sockaddr *) &sock, sizeof(sock)) < 0) {
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bb_perror_msg("bind");
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close(fd);
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return -1;
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}
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return fd;
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}
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