/* * socket.c -- DHCP server client/server socket creation * * udhcp client/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 <sys/ioctl.h>#include <netinet/in.h>#include <unistd.h>#include <string.h>#include <arpa/inet.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 read_interface(char *interface, int *ifindex, u_int32_t *addr, unsigned char *arp){	int fd;	struct ifreq ifr;	struct sockaddr_in *our_ip;	memset(&ifr, 0, sizeof(struct ifreq));	if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {		ifr.ifr_addr.sa_family = AF_INET;		strcpy(ifr.ifr_name, interface);		if (addr) { 			if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {				our_ip = (struct sockaddr_in *) &ifr.ifr_addr;				*addr = our_ip->sin_addr.s_addr;				DEBUG(LOG_INFO, "%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));			} else {				LOG(LOG_ERR, "SIOCGIFADDR failed, is the interface up and configured?: %s", 						strerror(errno));				return -1;			}		}				if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {			DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);			*ifindex = ifr.ifr_ifindex;		} else {			LOG(LOG_ERR, "SIOCGIFINDEX failed!: %s", strerror(errno));			return -1;		}		if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) {			memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);			DEBUG(LOG_INFO, "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",				arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);		} else {			LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %s", strerror(errno));			return -1;		}	} else {		LOG(LOG_ERR, "socket failed!: %s", strerror(errno));		return -1;	}	close(fd);	return 0;}int listen_socket(unsigned int ip, int port, char *inf){	struct ifreq interface;	int fd;	struct sockaddr_in addr;	int n = 1;	DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s\n", ip, port, inf);	if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {		DEBUG(LOG_ERR, "socket call failed: %s", strerror(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;	DEBUG(LOG_INFO, "Opening raw socket on ifindex %d\n", ifindex);	if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {		DEBUG(LOG_ERR, "socket call failed: %s", strerror(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", strerror(errno));		close(fd);		return -1;	}	return fd;}