File: socket.c

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udhcp 0.9.6-3
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/*
 * socket.c -- DHCP server client/server socket creation
 *
 * Moreton Bay DHCP Server
 * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
 *			Chris Trew <ctrew@moreton.com.au>
 *
 * Rewrite by 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 <netinet/in.h>
#include <unistd.h>
#include <string.h>
#include <net/if.h>
#include <errno.h>
#include <features.h>
#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
#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 "debug.h"

int listen_socket(unsigned int ip, int port, char *inf)
{
	struct ifreq interface;
	int fd;
	struct sockaddr_in addr;
	int n = 1;

	if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
		DEBUG(LOG_ERR, "socket call failed: %s", sys_errlist[errno]);
		return -1;
	}
	
	memset(&addr, 0, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_port = htons(port);
	addr.sin_addr.s_addr = ip;

	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1) {
		close(fd);
		return -1;
	}
	if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) == -1) {
		close(fd);
		return -1;
	}

	strncpy(interface.ifr_ifrn.ifrn_name, inf, IFNAMSIZ);
	if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,(char *)&interface, sizeof(interface)) < 0) {
		close(fd);
		return -1;
	}

	if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) {
		close(fd);
		return -1;
	}
	
	return fd;
}


int raw_socket(int ifindex)
{
	int fd;
	struct sockaddr_ll sock;

	if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
		DEBUG(LOG_ERR, "socket call failed: %s", sys_errlist[errno]);
		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: %s", sys_errlist[errno]);
		close(fd);
		return -1;
	}

	return fd;

}