diff options
Diffstat (limited to 'dhcp.h')
| -rw-r--r-- | dhcp.h | 87 |
1 files changed, 87 insertions, 0 deletions
@@ -0,0 +1,87 @@ +/* + * OpenVPN -- An application to securely tunnel IP networks + * over a single TCP/UDP port, with support for SSL/TLS-based + * session authentication and key exchange, + * packet encryption, packet authentication, and + * packet compression. + * + * Copyright (C) 2002-2008 Telethra, Inc. <sales@openvpn.net> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * 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 (see the file COPYING included with this + * distribution); if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef DHCP_H +#define DHCP_H + +#include "common.h" +#include "buffer.h" +#include "proto.h" + +#pragma pack(1) + +/* DHCP Option types */ +#define DHCP_PAD 0 +#define DHCP_ROUTER 3 +#define DHCP_MSG_TYPE 53 /* message type (u8) */ +#define DHCP_END 255 + +/* DHCP Messages types */ +#define DHCPDISCOVER 1 +#define DHCPOFFER 2 +#define DHCPREQUEST 3 +#define DHCPDECLINE 4 +#define DHCPACK 5 +#define DHCPNAK 6 +#define DHCPRELEASE 7 +#define DHCPINFORM 8 + +/* DHCP UDP port numbers */ +#define BOOTPS_PORT 67 +#define BOOTPC_PORT 68 + +struct dhcp { +# define BOOTREQUEST 1 +# define BOOTREPLY 2 + uint8_t op; /* message op */ + + uint8_t htype; /* hardware address type (e.g. '1' = 10Mb Ethernet) */ + uint8_t hlen; /* hardware address length (e.g. '6' for 10Mb Ethernet) */ + uint8_t hops; /* client sets to 0, may be used by relay agents */ + uint32_t xid; /* transaction ID, chosen by client */ + uint16_t secs; /* seconds since request process began, set by client */ + uint16_t flags; + uint32_t ciaddr; /* client IP address, client sets if known */ + uint32_t yiaddr; /* 'your' IP address -- server's response to client */ + uint32_t siaddr; /* server IP address */ + uint32_t giaddr; /* relay agent IP address */ + uint8_t chaddr[16]; /* client hardware address */ + uint8_t sname[64]; /* optional server host name */ + uint8_t file[128]; /* boot file name */ + uint32_t magic; /* must be 0x63825363 (network order) */ +}; + +struct dhcp_full { + struct openvpn_iphdr ip; + struct openvpn_udphdr udp; + struct dhcp dhcp; +# define DHCP_OPTIONS_BUFFER_SIZE 256 + uint8_t options[DHCP_OPTIONS_BUFFER_SIZE]; +}; + +#pragma pack() + +in_addr_t dhcp_extract_router_msg (struct buffer *ipbuf); + +#endif |