1/* 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 44#include "debug.h" 45 46int read_interface(char *interface, int *ifindex, u_int32_t *addr, unsigned char *arp) 47{ 48 int fd; 49 struct ifreq ifr; 50 struct sockaddr_in *our_ip; 51 52 memset(&ifr, 0, sizeof(struct ifreq)); 53 if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) { 54 ifr.ifr_addr.sa_family = AF_INET; 55 strcpy(ifr.ifr_name, interface); 56 57 if (addr) { 58 if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) { 59 our_ip = (struct sockaddr_in *) &ifr.ifr_addr; 60 *addr = our_ip->sin_addr.s_addr; 61 DEBUG(LOG_INFO, "%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr)); 62 } else { 63 LOG(LOG_ERR, "SIOCGIFADDR failed, is the interface up and configured?: %s", 64 strerror(errno)); 65 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 { 73 LOG(LOG_ERR, "SIOCGIFINDEX failed!: %s", strerror(errno)); 74 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 { 81 LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %s", strerror(errno)); 82 return -1; 83 } 84 } else { 85 LOG(LOG_ERR, "socket failed!: %s", strerror(errno)); 86 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; 99 100 DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s\n", ip, port, inf); 101 if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { 102 DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno)); 103 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; 139 140 DEBUG(LOG_INFO, "Opening raw socket on ifindex %d\n", ifindex); 141 if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) { 142 DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno)); 143 return -1; 144 } 145 146 sock.sll_family = AF_PACKET; 147 sock.sll_protocol = htons(ETH_P_IP); 148 sock.sll_ifindex = ifindex; 149 if (bind(fd, (struct sockaddr *) &sock, sizeof(sock)) < 0) { 150 DEBUG(LOG_ERR, "bind call failed: %s", strerror(errno)); 151 close(fd); 152 return -1; 153 } 154 155 return fd; 156} 157 158