2 * OpenVPN -- An application to securely tunnel IP networks
3 * over a single TCP/UDP port, with support for SSL/TLS-based
4 * session authentication and key exchange,
5 * packet encryption, packet authentication, and
8 * Copyright (C) 2002-2009 OpenVPN Technologies, Inc. <sales@openvpn.net>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program (see the file COPYING included with this
21 * distribution); if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
34 /* DHCP Option types */
37 #define DHCP_MSG_TYPE 53 /* message type (u8) */
40 /* DHCP Messages types */
41 #define DHCPDISCOVER 1
50 /* DHCP UDP port numbers */
51 #define BOOTPS_PORT 67
52 #define BOOTPC_PORT 68
55 # define BOOTREQUEST 1
57 uint8_t op
; /* message op */
59 uint8_t htype
; /* hardware address type (e.g. '1' = 10Mb Ethernet) */
60 uint8_t hlen
; /* hardware address length (e.g. '6' for 10Mb Ethernet) */
61 uint8_t hops
; /* client sets to 0, may be used by relay agents */
62 uint32_t xid
; /* transaction ID, chosen by client */
63 uint16_t secs
; /* seconds since request process began, set by client */
65 uint32_t ciaddr
; /* client IP address, client sets if known */
66 uint32_t yiaddr
; /* 'your' IP address -- server's response to client */
67 uint32_t siaddr
; /* server IP address */
68 uint32_t giaddr
; /* relay agent IP address */
69 uint8_t chaddr
[16]; /* client hardware address */
70 uint8_t sname
[64]; /* optional server host name */
71 uint8_t file
[128]; /* boot file name */
72 uint32_t magic
; /* must be 0x63825363 (network order) */
76 struct openvpn_iphdr ip
;
77 struct openvpn_udphdr udp
;
79 # define DHCP_OPTIONS_BUFFER_SIZE 256
80 uint8_t options
[DHCP_OPTIONS_BUFFER_SIZE
];
85 in_addr_t
dhcp_extract_router_msg (struct buffer
*ipbuf
);