131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* 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 <net/if.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 "common.h"
|
|
|
|
|
|
int read_interface(char *interface, int *ifindex, uint32_t *addr, uint8_t *arp)
|
|
{
|
|
int fd;
|
|
struct ifreq ifr;
|
|
struct sockaddr_in *our_ip;
|
|
|
|
memset(&ifr, 0, sizeof(struct ifreq));
|
|
fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
|
|
if (fd < 0) {
|
|
bb_perror_msg("socket failed");
|
|
return -1;
|
|
}
|
|
|
|
ifr.ifr_addr.sa_family = AF_INET;
|
|
strncpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name));
|
|
if (addr) {
|
|
if (ioctl(fd, SIOCGIFADDR, &ifr) != 0) {
|
|
bb_perror_msg("SIOCGIFADDR failed, is the interface up and configured?");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
|
|
*addr = our_ip->sin_addr.s_addr;
|
|
DEBUG("%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));
|
|
}
|
|
|
|
if (ifindex) {
|
|
if (ioctl(fd, SIOCGIFINDEX, &ifr) != 0) {
|
|
bb_perror_msg("SIOCGIFINDEX failed");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
DEBUG("adapter index %d", ifr.ifr_ifindex);
|
|
*ifindex = ifr.ifr_ifindex;
|
|
}
|
|
|
|
if (arp) {
|
|
if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) {
|
|
bb_perror_msg("SIOCGIFHWADDR failed");
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
|
|
DEBUG("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
|
|
arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int listen_socket(uint32_t ip, int port, char *inf)
|
|
{
|
|
struct ifreq interface;
|
|
int fd;
|
|
struct sockaddr_in addr;
|
|
|
|
DEBUG("Opening listen socket on 0x%08x:%d %s", ip, port, inf);
|
|
fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
if (fd < 0) {
|
|
bb_perror_msg("socket");
|
|
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_reuseaddr(fd) == -1) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
if (setsockopt_broadcast(fd) == -1) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
strncpy(interface.ifr_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;
|
|
}
|