1 /* vi: set sw=4 ts=4: */
3 * DHCP server client/server socket creation
6 * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
7 * Chris Trew <ctrew@moreton.com.au>
9 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
27 # include <netpacket/packet.h>
28 # include <net/ethernet.h>
30 # include <asm/types.h>
31 # include <linux/if_packet.h>
32 # include <linux/if_ether.h>
37 int FAST_FUNC udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac)
41 struct sockaddr_in *our_ip;
43 memset(&ifr, 0, sizeof(ifr));
44 fd = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
46 ifr.ifr_addr.sa_family = AF_INET;
47 strncpy_IFNAMSIZ(ifr.ifr_name, interface);
49 if (ioctl_or_perror(fd, SIOCGIFADDR, &ifr,
50 "is interface %s up and configured?", interface)
55 our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
56 *nip = our_ip->sin_addr.s_addr;
57 log1("IP %s", inet_ntoa(our_ip->sin_addr));
61 if (ioctl_or_warn(fd, SIOCGIFINDEX, &ifr) != 0) {
65 log1("Adapter index %d", ifr.ifr_ifindex);
66 *ifindex = ifr.ifr_ifindex;
70 if (ioctl_or_warn(fd, SIOCGIFHWADDR, &ifr) != 0) {
74 memcpy(mac, ifr.ifr_hwaddr.sa_data, 6);
75 log1("MAC %02x:%02x:%02x:%02x:%02x:%02x",
76 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
83 /* 1. None of the callers expects it to ever fail */
84 /* 2. ip was always INADDR_ANY */
85 int FAST_FUNC udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf)
88 struct sockaddr_in addr;
90 log1("Opening listen socket on *:%d %s", port, inf);
91 fd = xsocket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
93 setsockopt_reuseaddr(fd);
94 if (setsockopt_broadcast(fd) == -1)
95 bb_perror_msg_and_die("SO_BROADCAST");
97 /* NB: bug 1032 says this doesn't work on ethernet aliases (ethN:M) */
98 if (setsockopt_bindtodevice(fd, inf))
99 xfunc_die(); /* warning is already printed */
101 memset(&addr, 0, sizeof(addr));
102 addr.sin_family = AF_INET;
103 addr.sin_port = htons(port);
104 /* addr.sin_addr.s_addr = ip; - all-zeros is INADDR_ANY */
105 xbind(fd, (struct sockaddr *)&addr, sizeof(addr));