diff options
Diffstat (limited to 'networking/udhcp/clientsocket.c')
| -rw-r--r-- | networking/udhcp/clientsocket.c | 108 |
1 files changed, 0 insertions, 108 deletions
diff --git a/networking/udhcp/clientsocket.c b/networking/udhcp/clientsocket.c deleted file mode 100644 index 8e68f31..0000000 --- a/networking/udhcp/clientsocket.c +++ /dev/null @@ -1,108 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * clientsocket.c -- DHCP client socket creation - * - * udhcp client - * - * 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 "common.h" -#include "dhcpd.h" -#include "dhcpc.h" - - -//#include <features.h> -#include <asm/types.h> -#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined(_NEWLIB_VERSION) -#include <netpacket/packet.h> -#include <net/ethernet.h> -#else -#include <linux/if_packet.h> -#include <linux/if_ether.h> -#endif -#include <linux/filter.h> - -int FAST_FUNC udhcp_raw_socket(int ifindex) -{ - int fd; - struct sockaddr_ll sock; - - /* - * Comment: - * - * I've selected not to see LL header, so BPF doesn't see it, too. - * The filter may also pass non-IP and non-ARP packets, but we do - * a more complete check when receiving the message in userspace. - * - * and filter shamelessly stolen from: - * - * http://www.flamewarmaster.de/software/dhcpclient/ - * - * There are a few other interesting ideas on that page (look under - * "Motivation"). Use of netlink events is most interesting. Think - * of various network servers listening for events and reconfiguring. - * That would obsolete sending HUP signals and/or make use of restarts. - * - * Copyright: 2006, 2007 Stefan Rompf <sux@loplof.de>. - * License: GPL v2. - * - * TODO: make conditional? - */ -#define SERVER_AND_CLIENT_PORTS ((67 << 16) + 68) - static const struct sock_filter filter_instr[] = { - /* check for udp */ - BPF_STMT(BPF_LD|BPF_B|BPF_ABS, 9), - BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, IPPROTO_UDP, 2, 0), /* L5, L1, is UDP? */ - /* ugly check for arp on ethernet-like and IPv4 */ - BPF_STMT(BPF_LD|BPF_W|BPF_ABS, 2), /* L1: */ - BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x08000604, 3, 4), /* L3, L4 */ - /* skip IP header */ - BPF_STMT(BPF_LDX|BPF_B|BPF_MSH, 0), /* L5: */ - /* check udp source and destination ports */ - BPF_STMT(BPF_LD|BPF_W|BPF_IND, 0), - BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, SERVER_AND_CLIENT_PORTS, 0, 1), /* L3, L4 */ - /* returns */ - BPF_STMT(BPF_RET|BPF_K, 0x0fffffff ), /* L3: pass */ - BPF_STMT(BPF_RET|BPF_K, 0), /* L4: reject */ - }; - static const struct sock_fprog filter_prog = { - .len = sizeof(filter_instr) / sizeof(filter_instr[0]), - /* casting const away: */ - .filter = (struct sock_filter *) filter_instr, - }; - - log1("Opening raw socket on ifindex %d", ifindex); //log2? - - fd = xsocket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP)); - log1("Got raw socket fd %d", fd); //log2? - - if (SERVER_PORT == 67 && CLIENT_PORT == 68) { - /* Use only if standard ports are in use */ - /* Ignoring error (kernel may lack support for this) */ - if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog, - sizeof(filter_prog)) >= 0) - log1("Attached filter to raw socket fd %d", fd); // log? - } - - sock.sll_family = AF_PACKET; - sock.sll_protocol = htons(ETH_P_IP); - sock.sll_ifindex = ifindex; - xbind(fd, (struct sockaddr *) &sock, sizeof(sock)); - log1("Created raw socket"); - - return fd; -} |