/* * socket.c -- 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 <sys/types.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <netinet/in.h> #include <unistd.h> #include <string.h> #include <arpa/inet.h> #include <net/if.h> #include <errno.h> #include <features.h> #if __GLIBC__ >=2 && __GLIBC_MINOR >= 1 #include <netpacket/packet.h> #include <net/ethernet.h> #else #include <asm/types.h> #include <linux/if_packet.h> #include <linux/if_ether.h> #endif #include "socket.h" #include "common.h" int read_interface(char *interface, int *ifindex, uint32_t *addr, uint8_t *arp) { int fd; struct ifreq ifr; struct sockaddr_in *our_ip; memset(&ifr, 0, sizeof(struct ifreq)); if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) { ifr.ifr_addr.sa_family = AF_INET; strcpy(ifr.ifr_name, interface); if (addr) { if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) { our_ip = (struct sockaddr_in *) &ifr.ifr_addr; *addr = our_ip->sin_addr.s_addr; DEBUG(LOG_INFO, "%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr)); } else { LOG(LOG_ERR, "SIOCGIFADDR failed, is the interface up and configured?: %m"); return -1; } } if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) { DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex); *ifindex = ifr.ifr_ifindex; } else { LOG(LOG_ERR, "SIOCGIFINDEX failed!: %m"); return -1; } if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) { memcpy(arp, ifr.ifr_hwaddr.sa_data, 6); DEBUG(LOG_INFO, "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x", arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]); } else { LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %m"); return -1; } } else { LOG(LOG_ERR, "socket failed!: %m"); return -1; } close(fd); return 0; } int listen_socket(uint32_t ip, int port, char *inf) { struct ifreq interface; int fd; struct sockaddr_in addr; int n = 1; DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s", ip, port, inf); if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { DEBUG(LOG_ERR, "socket call failed: %m"); return -1; } memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(port); addr.sin_addr.s_addr = ip; if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1) { close(fd); return -1; } if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) == -1) { close(fd); return -1; } strncpy(interface.ifr_ifrn.ifrn_name, inf, IFNAMSIZ); if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,(char *)&interface, sizeof(interface)) < 0) { close(fd); return -1; } if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) { close(fd); return -1; } return fd; }