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Russ Dill61fb4892002-10-14 21:41:28 +00001/*
2 * socket.c -- DHCP server client/server socket creation
3 *
4 * udhcp client/server
5 * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
6 * Chris Trew <ctrew@moreton.com.au>
7 *
8 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
9 *
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.
14 *
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.
19 *
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.
23 */
24
25#include <sys/types.h>
26#include <sys/socket.h>
27#include <sys/ioctl.h>
28#include <netinet/in.h>
29#include <unistd.h>
30#include <string.h>
31#include <arpa/inet.h>
32#include <net/if.h>
33#include <errno.h>
34#include <features.h>
35#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
36#include <netpacket/packet.h>
37#include <net/ethernet.h>
38#else
39#include <asm/types.h>
40#include <linux/if_packet.h>
41#include <linux/if_ether.h>
42#endif
43
Russ Dill76729b82003-12-16 20:44:15 +000044#include "socket.h"
Glenn L McGrath24833432003-06-10 17:22:49 +000045#include "common.h"
Russ Dill61fb4892002-10-14 21:41:28 +000046
47int read_interface(char *interface, int *ifindex, u_int32_t *addr, unsigned char *arp)
48{
49 int fd;
50 struct ifreq ifr;
51 struct sockaddr_in *our_ip;
52
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);
57
58 if (addr) {
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));
63 } else {
Glenn L McGrath24833432003-06-10 17:22:49 +000064 LOG(LOG_ERR, "SIOCGIFADDR failed, is the interface up and configured?: %m");
Russ Dill61fb4892002-10-14 21:41:28 +000065 return -1;
66 }
67 }
68
69 if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
70 DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);
71 *ifindex = ifr.ifr_ifindex;
72 } else {
Glenn L McGrath24833432003-06-10 17:22:49 +000073 LOG(LOG_ERR, "SIOCGIFINDEX failed!: %m");
Russ Dill61fb4892002-10-14 21:41:28 +000074 return -1;
75 }
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]);
80 } else {
Glenn L McGrath24833432003-06-10 17:22:49 +000081 LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %m");
Russ Dill61fb4892002-10-14 21:41:28 +000082 return -1;
83 }
84 } else {
Glenn L McGrath24833432003-06-10 17:22:49 +000085 LOG(LOG_ERR, "socket failed!: %m");
Russ Dill61fb4892002-10-14 21:41:28 +000086 return -1;
87 }
88 close(fd);
89 return 0;
90}
91
92
93int listen_socket(unsigned int ip, int port, char *inf)
94{
95 struct ifreq interface;
96 int fd;
97 struct sockaddr_in addr;
98 int n = 1;
99
Glenn L McGrath8ce8f9b2003-08-29 15:19:44 +0000100 DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s", ip, port, inf);
Russ Dill61fb4892002-10-14 21:41:28 +0000101 if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
Glenn L McGrath24833432003-06-10 17:22:49 +0000102 DEBUG(LOG_ERR, "socket call failed: %m");
Russ Dill61fb4892002-10-14 21:41:28 +0000103 return -1;
104 }
105
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;
110
111 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1) {
112 close(fd);
113 return -1;
114 }
115 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) == -1) {
116 close(fd);
117 return -1;
118 }
119
120 strncpy(interface.ifr_ifrn.ifrn_name, inf, IFNAMSIZ);
121 if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,(char *)&interface, sizeof(interface)) < 0) {
122 close(fd);
123 return -1;
124 }
125
126 if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) {
127 close(fd);
128 return -1;
129 }
130
131 return fd;
132}
133
134
135int raw_socket(int ifindex)
136{
137 int fd;
138 struct sockaddr_ll sock;
139
Glenn L McGrath8ce8f9b2003-08-29 15:19:44 +0000140 DEBUG(LOG_INFO, "Opening raw socket on ifindex %d", ifindex);
Russ Dill61fb4892002-10-14 21:41:28 +0000141 if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
Glenn L McGrath24833432003-06-10 17:22:49 +0000142 DEBUG(LOG_ERR, "socket call failed: %m");
Russ Dill61fb4892002-10-14 21:41:28 +0000143 return -1;
144 }
Eric Andersenc16686c2003-11-14 03:00:04 +0000145
146 while (fd >= 0 && fd < 3) fd = dup(fd); /* don't let daemon close fds on us */
Russ Dill61fb4892002-10-14 21:41:28 +0000147
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) {
Glenn L McGrath24833432003-06-10 17:22:49 +0000152 DEBUG(LOG_ERR, "bind call failed: %m");
Russ Dill61fb4892002-10-14 21:41:28 +0000153 close(fd);
154 return -1;
155 }
156
157 return fd;
158}