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/*
* 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 "common.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?: %m");
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!: %m");
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!: %m");
return -1;
}
} else {
LOG(LOG_ERR, "socket failed!: %m");
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: %m");
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: %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;
}
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