2 * socket.c -- DHCP server client/server socket creation
5 * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
6 * Chris Trew <ctrew@moreton.com.au>
8 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <sys/types.h>
26 #include <sys/socket.h>
27 #include <sys/ioctl.h>
28 #include <netinet/in.h>
31 #include <arpa/inet.h>
35 #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
36 #include <netpacket/packet.h>
37 #include <net/ethernet.h>
39 #include <asm/types.h>
40 #include <linux/if_packet.h>
41 #include <linux/if_ether.h>
47 int read_interface(char *interface, int *ifindex, u_int32_t *addr, unsigned char *arp)
51 struct sockaddr_in *our_ip;
53 memset(&ifr, 0, sizeof(struct ifreq));
54 if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
55 ifr.ifr_addr.sa_family = AF_INET;
56 strcpy(ifr.ifr_name, interface);
59 if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
60 our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
61 *addr = our_ip->sin_addr.s_addr;
62 DEBUG(LOG_INFO, "%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));
64 LOG(LOG_ERR, "SIOCGIFADDR failed, is the interface up and configured?: %m");
69 if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
70 DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);
71 *ifindex = ifr.ifr_ifindex;
73 LOG(LOG_ERR, "SIOCGIFINDEX failed!: %m");
76 if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) {
77 memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
78 DEBUG(LOG_INFO, "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
79 arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
81 LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %m");
85 LOG(LOG_ERR, "socket failed!: %m");
93 int listen_socket(unsigned int ip, int port, char *inf)
95 struct ifreq interface;
97 struct sockaddr_in addr;
100 DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s", ip, port, inf);
101 if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
102 DEBUG(LOG_ERR, "socket call failed: %m");
106 memset(&addr, 0, sizeof(addr));
107 addr.sin_family = AF_INET;
108 addr.sin_port = htons(port);
109 addr.sin_addr.s_addr = ip;
111 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1) {
115 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) == -1) {
120 strncpy(interface.ifr_ifrn.ifrn_name, inf, IFNAMSIZ);
121 if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,(char *)&interface, sizeof(interface)) < 0) {
126 if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) {
135 int raw_socket(int ifindex)
138 struct sockaddr_ll sock;
140 DEBUG(LOG_INFO, "Opening raw socket on ifindex %d", ifindex);
141 if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
142 DEBUG(LOG_ERR, "socket call failed: %m");
146 while (fd >= 0 && fd < 3) fd = dup(fd); /* don't let daemon close fds on us */
148 sock.sll_family = AF_PACKET;
149 sock.sll_protocol = htons(ETH_P_IP);
150 sock.sll_ifindex = ifindex;
151 if (bind(fd, (struct sockaddr *) &sock, sizeof(sock)) < 0) {
152 DEBUG(LOG_ERR, "bind call failed: %m");