112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* 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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#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 FAST_FUNC udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac)
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{
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/* char buffer instead of bona-fide struct avoids aliasing warning */
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char ifr_buf[sizeof(struct ifreq)];
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struct ifreq *const ifr = (void *)ifr_buf;
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int fd;
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struct sockaddr_in *our_ip;
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memset(ifr, 0, sizeof(*ifr));
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fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
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ifr->ifr_addr.sa_family = AF_INET;
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strncpy_IFNAMSIZ(ifr->ifr_name, interface);
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if (nip) {
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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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*nip = our_ip->sin_addr.s_addr;
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log1("IP %s", 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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log1("Adapter index %d", ifr->ifr_ifindex);
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*ifindex = ifr->ifr_ifindex;
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}
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if (mac) {
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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(mac, ifr->ifr_hwaddr.sa_data, 6);
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log1("MAC %02x:%02x:%02x:%02x:%02x:%02x",
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mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
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}
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close(fd);
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return 0;
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}
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/* 1. None of the callers expects it to ever fail */
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/* 2. ip was always INADDR_ANY */
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int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
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{
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int fd;
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struct sockaddr_in addr;
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log1("Opening listen socket on *:%d %s", port, inf);
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fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
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setsockopt_reuseaddr(fd);
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if (setsockopt_broadcast(fd) == -1)
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bb_perror_msg_and_die("SO_BROADCAST");
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/* NB: bug 1032 says this doesn't work on ethernet aliases (ethN:M) */
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if (setsockopt_bindtodevice(fd, inf))
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xfunc_die(); /* warning is already printed */
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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; - all-zeros is INADDR_ANY */
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xbind(fd, (struct sockaddr *)&addr, sizeof(addr));
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return fd;
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}
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