mirror of
https://github.com/sheumann/hush.git
synced 2024-12-23 05:29:58 +00:00
111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* 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 "common.h"
|
|
#include <net/if.h>
|
|
|
|
int FAST_FUNC udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac)
|
|
{
|
|
/* char buffer instead of bona-fide struct avoids aliasing warning */
|
|
char ifr_buf[sizeof(struct ifreq)];
|
|
struct ifreq *const ifr = (void *)ifr_buf;
|
|
|
|
int fd;
|
|
struct sockaddr_in *our_ip;
|
|
|
|
memset(ifr, 0, sizeof(*ifr));
|
|
fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
|
|
|
|
ifr->ifr_addr.sa_family = AF_INET;
|
|
strncpy_IFNAMSIZ(ifr->ifr_name, interface);
|
|
if (nip) {
|
|
if (ioctl_or_perror(fd, SIOCGIFADDR, ifr,
|
|
"is interface %s up and configured?", interface)
|
|
) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
our_ip = (struct sockaddr_in *) &ifr->ifr_addr;
|
|
*nip = our_ip->sin_addr.s_addr;
|
|
log1("IP %s", inet_ntoa(our_ip->sin_addr));
|
|
}
|
|
|
|
if (ifindex) {
|
|
if (ioctl_or_warn(fd, SIOCGIFINDEX, ifr) != 0) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
log1("Adapter index %d", ifr->ifr_ifindex);
|
|
*ifindex = ifr->ifr_ifindex;
|
|
}
|
|
|
|
if (mac) {
|
|
if (ioctl_or_warn(fd, SIOCGIFHWADDR, ifr) != 0) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
memcpy(mac, ifr->ifr_hwaddr.sa_data, 6);
|
|
log1("MAC %02x:%02x:%02x:%02x:%02x:%02x",
|
|
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
|
|
}
|
|
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
/* 1. None of the callers expects it to ever fail */
|
|
/* 2. ip was always INADDR_ANY */
|
|
int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
|
|
{
|
|
int fd;
|
|
struct sockaddr_in addr;
|
|
char *colon;
|
|
|
|
log1("Opening listen socket on *:%d %s", port, inf);
|
|
fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
|
|
setsockopt_reuseaddr(fd);
|
|
if (setsockopt_broadcast(fd) == -1)
|
|
bb_perror_msg_and_die("SO_BROADCAST");
|
|
|
|
/* SO_BINDTODEVICE doesn't work on ethernet aliases (ethN:M) */
|
|
colon = strrchr(inf, ':');
|
|
if (colon)
|
|
*colon = '\0';
|
|
|
|
if (setsockopt_bindtodevice(fd, inf))
|
|
xfunc_die(); /* warning is already printed */
|
|
|
|
if (colon)
|
|
*colon = ':';
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(port);
|
|
/* addr.sin_addr.s_addr = ip; - all-zeros is INADDR_ANY */
|
|
xbind(fd, (struct sockaddr *)&addr, sizeof(addr));
|
|
|
|
return fd;
|
|
}
|