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