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126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* socket.c -- DHCP server client/server socket creation
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*
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* udhcp client/server
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* Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
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* Chris Trew <ctrew@moreton.com.au>
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*
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* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <net/if.h>
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#include <features.h>
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#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
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#include <netpacket/packet.h>
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#include <net/ethernet.h>
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#else
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#include <asm/types.h>
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#include <linux/if_packet.h>
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#include <linux/if_ether.h>
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#endif
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#include "common.h"
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int read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t *arp)
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{
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int fd;
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struct ifreq ifr;
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struct sockaddr_in *our_ip;
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memset(&ifr, 0, sizeof(ifr));
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fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
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if (fd < 0) {
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bb_perror_msg("socket failed");
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return -1;
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}
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ifr.ifr_addr.sa_family = AF_INET;
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strncpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name));
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if (addr) {
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if (ioctl_or_perror(fd, SIOCGIFADDR, &ifr,
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"is interface %s up and configured?", interface)
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) {
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close(fd);
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return -1;
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}
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our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
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*addr = our_ip->sin_addr.s_addr;
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DEBUG("%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));
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}
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if (ifindex) {
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if (ioctl_or_warn(fd, SIOCGIFINDEX, &ifr) != 0) {
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close(fd);
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return -1;
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}
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DEBUG("adapter index %d", ifr.ifr_ifindex);
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*ifindex = ifr.ifr_ifindex;
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}
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if (arp) {
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if (ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr) != 0) {
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close(fd);
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return -1;
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}
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memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
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DEBUG("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
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arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
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}
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return 0;
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}
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int listen_socket(uint32_t ip, int port, const char *inf)
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{
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struct ifreq interface;
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int fd;
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struct sockaddr_in addr;
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DEBUG("Opening listen socket on 0x%08x:%d %s", ip, port, inf);
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fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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addr.sin_addr.s_addr = ip;
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if (setsockopt_reuseaddr(fd) == -1) {
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close(fd);
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return -1;
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}
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if (setsockopt_broadcast(fd) == -1) {
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close(fd);
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return -1;
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}
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strncpy(interface.ifr_name, inf, IFNAMSIZ);
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if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &interface, sizeof(interface)) < 0) {
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close(fd);
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return -1;
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}
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if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
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close(fd);
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return -1;
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}
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return fd;
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}
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