forked from osmocom/wireshark
![Gilbert Ramirez](/assets/img/avatar_default.png)
usages of tvb_get_ptr(). packet-ieee80211.c still has one bad usage, in which it *does* modify the tvbuff's data. svn path=/trunk/; revision=3128
940 lines
28 KiB
C
940 lines
28 KiB
C
/* packet-bootp.c
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* Routines for BOOTP/DHCP packet disassembly
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* Gilbert Ramirez <gram@xiexie.org>
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*
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* $Id: packet-bootp.c,v 1.48 2001/03/13 21:34:23 gram Exp $
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*
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* The information used comes from:
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* RFC 951: Bootstrap Protocol
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* RFC 1542: Clarifications and Extensions for the Bootstrap Protocol
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* RFC 2131: Dynamic Host Configuration Protocol
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* RFC 2132: DHCP Options and BOOTP Vendor Extensions
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* RFC 2489: Procedure for Defining New DHCP Options
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* RFC 3046: DHCP Relay Agent Information Option
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* BOOTP and DHCP Parameters
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* http://www.isi.edu/in-notes/iana/assignments/bootp-dhcp-parameters
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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#include "packet-arp.h"
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static int proto_bootp = -1;
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static int hf_bootp_type = -1;
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static int hf_bootp_hw_type = -1;
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static int hf_bootp_hw_len = -1;
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static int hf_bootp_hops = -1;
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static int hf_bootp_id = -1;
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static int hf_bootp_secs = -1;
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static int hf_bootp_flag = -1;
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static int hf_bootp_ip_client = -1;
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static int hf_bootp_ip_your = -1;
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static int hf_bootp_ip_server = -1;
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static int hf_bootp_ip_relay = -1;
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static int hf_bootp_hw_addr = -1;
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static int hf_bootp_server = -1;
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static int hf_bootp_file = -1;
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static int hf_bootp_cookie = -1;
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static int hf_bootp_dhcp = -1;
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static guint ett_bootp = -1;
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static guint ett_bootp_option = -1;
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#define UDP_PORT_BOOTPS 67
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enum field_type { none, ipv4, string, toggle, yes_no, special, opaque,
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time_in_secs,
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val_u_byte, val_u_short, val_u_long,
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val_s_long };
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struct opt_info {
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char *text;
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enum field_type ftype;
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};
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#define NUM_OPT_INFOS 128
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#define NUM_O63_SUBOPTS 11
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static int dissect_netware_ip_suboption(proto_tree *v_tree, tvbuff_t *tvb,
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int optp);
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static int bootp_dhcp_decode_agent_info(proto_tree *v_tree, tvbuff_t *tvb,
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int optp);
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static const char *
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get_dhcp_type(guint8 byte)
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{
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static const char *opt53_text[] = {
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"Unknown Message Type",
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"Discover",
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"Offer",
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"Request",
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"Decline",
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"ACK",
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"NAK",
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"Release",
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"Inform"
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};
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int i;
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if (byte > 0 && byte < (sizeof opt53_text / sizeof opt53_text[0]))
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i = byte;
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else
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i = 0;
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return opt53_text[i];
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}
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/* Returns the number of bytes consumed by this option. */
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static int
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bootp_option(tvbuff_t *tvb, proto_tree *bp_tree, int voff, int eoff)
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{
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char *text;
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enum field_type ftype;
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u_char code = tvb_get_guint8(tvb, voff);
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int vlen;
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u_char byte;
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int i,optp, consumed;
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u_long time_secs;
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proto_tree *v_tree;
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proto_item *vti;
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static const value_string nbnt_vals[] = {
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{0x1, "B-node" },
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{0x2, "P-node" },
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{0x4, "M-node" },
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{0x8, "H-node" },
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{0, NULL } };
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static struct opt_info opt[] = {
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/* 0 */ { "Padding", none },
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/* 1 */ { "Subnet Mask", ipv4 },
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/* 2 */ { "Time Offset", val_s_long },
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/* 3 */ { "Router", ipv4 },
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/* 4 */ { "Time Server", ipv4 },
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/* 5 */ { "Name Server", ipv4 },
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/* 6 */ { "Domain Name Server", ipv4 },
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/* 7 */ { "Log Server", ipv4 },
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/* 8 */ { "Cookie Server", ipv4 },
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/* 9 */ { "LPR Server", ipv4 },
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/* 10 */ { "Impress Server", ipv4 },
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/* 11 */ { "Resource Location Server", ipv4 },
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/* 12 */ { "Host Name", string },
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/* 13 */ { "Boot File Size", val_u_short },
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/* 14 */ { "Merit Dump File", string },
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/* 15 */ { "Domain Name", string },
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/* 16 */ { "Swap Server", ipv4 },
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/* 17 */ { "Root Path", string },
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/* 18 */ { "Extensions Path", string },
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/* 19 */ { "IP Forwarding", toggle },
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/* 20 */ { "Non-Local Source Routing", toggle },
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/* 21 */ { "Policy Filter", special },
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/* 22 */ { "Maximum Datagram Reassembly Size", val_u_short },
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/* 23 */ { "Default IP Time-to-Live", val_u_byte },
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/* 24 */ { "Path MTU Aging Timeout", time_in_secs },
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/* 25 */ { "Path MTU Plateau Table", val_u_short },
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/* 26 */ { "Interface MTU", val_u_short },
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/* 27 */ { "All Subnets are Local", yes_no },
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/* 28 */ { "Broadcast Address", ipv4 },
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/* 29 */ { "Perform Mask Discovery", toggle },
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/* 30 */ { "Mask Supplier", yes_no },
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/* 31 */ { "Perform Router Discover", toggle },
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/* 32 */ { "Router Solicitation Address", ipv4 },
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/* 33 */ { "Static Route", special },
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/* 34 */ { "Trailer Encapsulation", toggle },
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/* 35 */ { "ARP Cache Timeout", time_in_secs },
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/* 36 */ { "Ethernet Encapsulation", toggle },
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/* 37 */ { "TCP Default TTL", val_u_byte },
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/* 38 */ { "TCP Keepalive Interval", time_in_secs },
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/* 39 */ { "TCP Keepalive Garbage", toggle },
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/* 40 */ { "Network Information Service Domain", string },
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/* 41 */ { "Network Information Service Servers", ipv4 },
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/* 42 */ { "Network Time Protocol Servers", ipv4 },
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/* 43 */ { "Vendor-Specific Information", special },
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/* 44 */ { "NetBIOS over TCP/IP Name Server", ipv4 },
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/* 45 */ { "NetBIOS over TCP/IP Datagram Distribution Name Server", ipv4 },
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/* 46 */ { "NetBIOS over TCP/IP Node Type", special },
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/* 47 */ { "NetBIOS over TCP/IP Scope", string },
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/* 48 */ { "X Window System Font Server", ipv4 },
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/* 49 */ { "X Window System Display Manager", ipv4 },
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/* 50 */ { "Requested IP Address", ipv4 },
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/* 51 */ { "IP Address Lease Time", time_in_secs },
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/* 52 */ { "Option Overload", special },
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/* 53 */ { "DHCP Message Type", special },
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/* 54 */ { "Server Identifier", ipv4 },
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/* 55 */ { "Parameter Request List", special },
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/* 56 */ { "Message", string },
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/* 57 */ { "Maximum DHCP Message Size", val_u_short },
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/* 58 */ { "Renewal Time Value", time_in_secs },
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/* 59 */ { "Rebinding Time Value", time_in_secs },
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/* 60 */ { "Vendor class identifier", opaque },
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/* 61 */ { "Client identifier", special },
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/* 62 */ { "Novell/Netware IP domain", string },
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/* 63 */ { "Novell Options", special },
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/* 64 */ { "Network Information Service+ Domain", string },
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/* 65 */ { "Network Information Service+ Servers", ipv4 },
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/* 66 */ { "TFTP Server Name", string },
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/* 67 */ { "Bootfile name", string },
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/* 68 */ { "Mobile IP Home Agent", ipv4 },
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/* 69 */ { "SMTP Server", ipv4 },
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/* 70 */ { "POP3 Server", ipv4 },
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/* 71 */ { "NNTP Server", ipv4 },
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/* 72 */ { "Default WWW Server", ipv4 },
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/* 73 */ { "Default Finger Server", ipv4 },
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/* 74 */ { "Default IRC Server", ipv4 },
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/* 75 */ { "StreetTalk Server", ipv4 },
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/* 76 */ { "StreetTalk Directory Assistance Server", ipv4 },
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/* 77 */ { "User Class Information", opaque },
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/* 78 */ { "Directory Agent Information", opaque },
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/* 79 */ { "Service Location Agent Scope", opaque },
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/* 80 */ { "Naming Authority", opaque },
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/* 81 */ { "Client Fully Qualified Domain Name", opaque },
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/* 82 */ { "Agent Information Option", special },
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/* 83 */ { "Unassigned", opaque },
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/* 84 */ { "Unassigned", opaque },
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/* 85 */ { "Novell Directory Services Servers", opaque },
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/* 86 */ { "Novell Directory Services Tree Name", opaque },
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/* 87 */ { "Novell Directory Services Context", opaque },
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/* 88 */ { "IEEE 1003.1 POSIX Timezone", opaque },
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/* 89 */ { "Fully Qualified Domain Name", opaque },
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/* 90 */ { "Authentication", opaque },
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/* 91 */ { "Vines TCP/IP Server Option", opaque },
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/* 92 */ { "Server Selection Option", opaque },
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/* 93 */ { "Client System Architecture", opaque },
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/* 94 */ { "Client Network Device Interface", opaque },
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/* 95 */ { "Lightweight Directory Access Protocol", opaque },
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/* 96 */ { "IPv6 Transitions", opaque },
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/* 97 */ { "UUID/GUID-based Client Identifier", opaque },
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/* 98 */ { "Open Group's User Authentication", opaque },
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/* 99 */ { "Unassigned", opaque },
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/* 100 */ { "Printer Name", opaque },
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/* 101 */ { "MDHCP multicast address", opaque },
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/* 102 */ { "Removed/unassigned", opaque },
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/* 103 */ { "Removed/unassigned", opaque },
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/* 104 */ { "Removed/unassigned", opaque },
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/* 105 */ { "Removed/unassigned", opaque },
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/* 106 */ { "Removed/unassigned", opaque },
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/* 107 */ { "Removed/unassigned", opaque },
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/* 108 */ { "Swap Path Option", opaque },
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/* 109 */ { "Unassigned", opaque },
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/* 110 */ { "IPX Compability", opaque },
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/* 111 */ { "Unassigned", opaque },
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/* 112 */ { "Netinfo Parent Server Address", opaque },
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/* 113 */ { "Netinfo Parent Server Tag", opaque },
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/* 114 */ { "URL", opaque },
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/* 115 */ { "DHCP Failover Protocol", opaque },
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/* 116 */ { "DHCP Auto-Configuration", opaque },
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/* 117 */ { "Unassigned", opaque },
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/* 118 */ { "Unassigned", opaque },
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/* 119 */ { "Unassigned", opaque },
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/* 120 */ { "Unassigned", opaque },
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/* 121 */ { "Unassigned", opaque },
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/* 122 */ { "Unassigned", opaque },
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/* 123 */ { "Unassigned", opaque },
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/* 124 */ { "Unassigned", opaque },
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/* 125 */ { "Unassigned", opaque },
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/* 126 */ { "Extension", opaque },
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/* 127 */ { "Extension", opaque }
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};
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/* Options whose length isn't "vlen + 2". */
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switch (code) {
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case 0: /* Padding */
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/* check how much padding we have */
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for (i = voff + 1; i < eoff; i++ ) {
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if (tvb_get_guint8(tvb, i) != 0) {
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break;
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}
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}
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i = i - voff;
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if (bp_tree != NULL)
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proto_tree_add_text(bp_tree, tvb, voff, i, "Padding");
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consumed = i;
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return consumed;
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break;
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case 255: /* End Option */
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if (bp_tree != NULL)
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proto_tree_add_text(bp_tree, tvb, voff, 1, "End Option");
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consumed = 1;
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return consumed;
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}
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/*
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* Get the length of the option, and the number of bytes it
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* consumes (the length doesn't include the option code or
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* length bytes).
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*/
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vlen = tvb_get_guint8(tvb, voff+1);
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consumed = vlen + 2;
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if (bp_tree == NULL) {
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/* Don't put anything in the protocol tree. */
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return consumed;
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}
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text = opt[code].text;
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/* Special cases */
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switch (code) {
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case 21: /* Policy Filter */
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if (vlen == 8) {
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/* one IP address pair */
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proto_tree_add_text(bp_tree, tvb, voff, consumed,
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"Option %d: %s = %s/%s", code, text,
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ip_to_str(tvb_get_ptr(tvb, voff+2, 4)),
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ip_to_str(tvb_get_ptr(tvb, voff+6, 4)));
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} else {
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/* > 1 IP address pair. Let's make a sub-tree */
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vti = proto_tree_add_text(bp_tree, tvb, voff,
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consumed, "Option %d: %s", code, text);
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v_tree = proto_item_add_subtree(vti, ett_bootp_option);
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for (i = voff + 2; i < voff + consumed; i += 8) {
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proto_tree_add_text(v_tree, tvb, i, 8, "IP Address/Mask: %s/%s",
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ip_to_str(tvb_get_ptr(tvb, i, 4)),
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ip_to_str(tvb_get_ptr(tvb, i+4, 4)));
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}
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}
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break;
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case 33: /* Static Route */
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if (vlen == 8) {
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/* one IP address pair */
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proto_tree_add_text(bp_tree, tvb, voff, consumed,
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"Option %d: %s = %s/%s", code, text,
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ip_to_str(tvb_get_ptr(tvb, voff+2, 4)),
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ip_to_str(tvb_get_ptr(tvb, voff+6, 4)));
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} else {
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/* > 1 IP address pair. Let's make a sub-tree */
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vti = proto_tree_add_text(bp_tree, tvb, voff,
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consumed, "Option %d: %s", code, text);
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v_tree = proto_item_add_subtree(vti, ett_bootp_option);
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for (i = voff + 2; i < voff + consumed; i += 8) {
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proto_tree_add_text(v_tree, tvb, i, 8,
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"Destination IP Address/Router: %s/%s",
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ip_to_str(tvb_get_ptr(tvb, i, 4)),
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ip_to_str(tvb_get_ptr(tvb, i+4, 4)));
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}
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}
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break;
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case 43: /* Vendor-Specific Info */
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proto_tree_add_text(bp_tree, tvb, voff, consumed,
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"Option %d: %s", code, text);
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break;
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case 46: /* NetBIOS-over-TCP/IP Node Type */
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byte = tvb_get_guint8(tvb, voff+2);
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proto_tree_add_text(bp_tree, tvb, voff, consumed,
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"Option %d: %s = %s", code, text,
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val_to_str(byte, nbnt_vals,
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"Unknown (0x%02x)"));
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break;
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case 53: /* DHCP Message Type */
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proto_tree_add_text(bp_tree, tvb, voff, 3, "Option %d: %s = DHCP %s",
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code, text, get_dhcp_type(tvb_get_guint8(tvb, voff+2)));
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break;
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case 55: /* Parameter Request List */
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vti = proto_tree_add_text(bp_tree, tvb, voff,
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vlen + 2, "Option %d: %s", code, text);
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v_tree = proto_item_add_subtree(vti, ett_bootp_option);
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for (i = 0; i < vlen; i++) {
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byte = tvb_get_guint8(tvb, voff+2+i);
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if (byte < NUM_OPT_INFOS) {
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proto_tree_add_text(v_tree, tvb, voff+2+i, 1, "%d = %s",
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byte, opt[byte].text);
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} else {
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proto_tree_add_text(vti, tvb, voff+2+i, 1,
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"Unknown Option Code: %d", byte);
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}
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}
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break;
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case 61: /* Client Identifier */
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/* We *MAY* use hwtype/hwaddr. If we have 7 bytes, I'll
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guess that the first is the hwtype, and the last 6
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are the hw addr */
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if (vlen == 7) {
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guint8 htype;
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vti = proto_tree_add_text(bp_tree, tvb, voff,
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consumed, "Option %d: %s", code, text);
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v_tree = proto_item_add_subtree(vti, ett_bootp_option);
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htype = tvb_get_guint8(tvb, voff+2);
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proto_tree_add_text(v_tree, tvb, voff+2, 1,
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"Hardware type: %s",
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arphrdtype_to_str(htype,
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"Unknown (0x%02x)"));
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proto_tree_add_text(v_tree, tvb, voff+3, 6,
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"Client hardware address: %s",
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arphrdaddr_to_str(tvb_get_ptr(tvb, voff+3, 6),
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6, htype));
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} else {
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/* otherwise, it's opaque data */
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proto_tree_add_text(bp_tree, tvb, voff, consumed,
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"Option %d: %s (%d bytes)", code, text, vlen);
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}
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break;
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case 63: /* NetWare/IP options */
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vti = proto_tree_add_text(bp_tree, tvb, voff,
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consumed, "Option %d: %s", code, text);
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v_tree = proto_item_add_subtree(vti, ett_bootp_option);
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optp = voff+2;
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while (optp < voff+consumed)
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optp = dissect_netware_ip_suboption(v_tree, tvb, optp);
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break;
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case 82: /* Relay Agent Information Option */
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vti = proto_tree_add_text(bp_tree, tvb, voff, consumed,
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"Option %d: %s (%d bytes)",
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code, text, vlen);
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v_tree = proto_item_add_subtree(vti, ett_bootp_option);
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optp = voff+2;
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while (optp < voff+consumed) {
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optp = bootp_dhcp_decode_agent_info(v_tree, tvb, optp);
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}
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break;
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default: /* not special */
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break;
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}
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/* Normal cases */
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if (code < NUM_OPT_INFOS) {
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text = opt[code].text;
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ftype = opt[code].ftype;
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|
|
switch (ftype) {
|
|
|
|
case special:
|
|
return consumed;
|
|
|
|
case ipv4:
|
|
if (vlen == 4) {
|
|
/* one IP address */
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s = %s", code, text,
|
|
ip_to_str(tvb_get_ptr(tvb, voff+2, 4)));
|
|
} else {
|
|
/* > 1 IP addresses. Let's make a sub-tree */
|
|
vti = proto_tree_add_text(bp_tree, tvb, voff,
|
|
consumed, "Option %d: %s", code, text);
|
|
v_tree = proto_item_add_subtree(vti, ett_bootp_option);
|
|
for (i = voff + 2; i < voff + consumed; i += 4) {
|
|
proto_tree_add_text(v_tree, tvb, i, 4, "IP Address: %s",
|
|
ip_to_str(tvb_get_ptr(tvb, i, 4)));
|
|
}
|
|
}
|
|
break;
|
|
|
|
case string:
|
|
/* Fix for non null-terminated string supplied by
|
|
* John Lines <John.Lines@aeat.co.uk>
|
|
*/
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s = %.*s", code, text, vlen,
|
|
tvb_get_ptr(tvb, voff+2, consumed-2));
|
|
break;
|
|
|
|
case opaque:
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s (%d bytes)",
|
|
code, text, vlen);
|
|
break;
|
|
|
|
case val_u_short:
|
|
if (vlen == 2) {
|
|
/* one u_short */
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s = %d", code, text,
|
|
tvb_get_ntohs(tvb, voff+2));
|
|
} else {
|
|
/* > 1 u_short */
|
|
vti = proto_tree_add_text(bp_tree, tvb, voff,
|
|
consumed, "Option %d: %s", code, text);
|
|
v_tree = proto_item_add_subtree(vti, ett_bootp_option);
|
|
for (i = voff + 2; i < voff + consumed; i += 2) {
|
|
proto_tree_add_text(v_tree, tvb, i, 4, "Value: %d",
|
|
tvb_get_ntohs(tvb, i));
|
|
}
|
|
}
|
|
break;
|
|
|
|
case val_u_long:
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s = %d", code, text,
|
|
tvb_get_ntohl(tvb, voff+2));
|
|
break;
|
|
|
|
case val_u_byte:
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s = %d", code, text,
|
|
tvb_get_guint8(tvb, voff+2));
|
|
break;
|
|
|
|
case toggle:
|
|
i = tvb_get_guint8(tvb, voff+2);
|
|
if (i != 0 && i != 1) {
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s = Invalid Value %d", code, text,
|
|
i);
|
|
} else {
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s = %s", code, text,
|
|
i == 0 ? "Disabled" : "Enabled");
|
|
}
|
|
break;
|
|
|
|
case yes_no:
|
|
i = tvb_get_guint8(tvb, voff+2);
|
|
if (i != 0 && i != 1) {
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s = Invalid Value %d", code, text,
|
|
i);
|
|
} else {
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s = %s", code, text,
|
|
i == 0 ? "No" : "Yes");
|
|
}
|
|
break;
|
|
|
|
case time_in_secs:
|
|
time_secs = tvb_get_ntohl(tvb, voff+2);
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s = %s", code, text,
|
|
((time_secs == 0xffffffff) ?
|
|
"infinity" :
|
|
time_secs_to_str(time_secs)));
|
|
break;
|
|
|
|
default:
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Option %d: %s (%d bytes)", code, text, vlen);
|
|
}
|
|
} else {
|
|
proto_tree_add_text(bp_tree, tvb, voff, consumed,
|
|
"Unknown Option Code: %d (%d bytes)", code, vlen);
|
|
}
|
|
|
|
return consumed;
|
|
}
|
|
|
|
static int
|
|
bootp_dhcp_decode_agent_info(proto_tree *v_tree, tvbuff_t *tvb, int optp)
|
|
{
|
|
guint8 subopt;
|
|
guint8 subopt_len;
|
|
|
|
subopt = tvb_get_guint8(tvb, optp);
|
|
subopt_len = tvb_get_guint8(tvb, optp+1);
|
|
switch (subopt) {
|
|
case 1:
|
|
proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
|
|
"Agent Circuit ID (%d bytes)", subopt_len);
|
|
break;
|
|
case 2:
|
|
proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
|
|
"Agent Remote ID (%d bytes)", subopt_len);
|
|
break;
|
|
default:
|
|
proto_tree_add_text(v_tree, tvb, optp, subopt_len + 2,
|
|
"Unknown agent option: %d", subopt);
|
|
break;
|
|
}
|
|
optp += (subopt_len + 2);
|
|
return optp;
|
|
}
|
|
|
|
static int
|
|
dissect_netware_ip_suboption(proto_tree *v_tree, tvbuff_t *tvb, int optp)
|
|
{
|
|
guint8 subopt;
|
|
guint8 subopt_len;
|
|
int slask;
|
|
proto_tree *o63_v_tree;
|
|
proto_item *vti;
|
|
|
|
struct o63_opt_info {
|
|
char *truet;
|
|
char *falset;
|
|
enum field_type ft;
|
|
};
|
|
|
|
static struct o63_opt_info o63_opt[]= {
|
|
/* 0 */ {"","",none},
|
|
/* 1 */ {"NWIP does not exist on subnet","",string},
|
|
/* 2 */ {"NWIP exist in options area","",string},
|
|
/* 3 */ {"NWIP exists in sname/file","",string},
|
|
/* 4 */ {"NWIP exists, but too big","",string},
|
|
/* 5 */ {"Broadcast for nearest Netware server","Do NOT Broadcast for nearest Netware server",yes_no},
|
|
/* 6 */ {"Preferred DSS server","",ipv4},
|
|
/* 7 */ {"Nearest NWIP server","",ipv4},
|
|
/* 8 */ {"Autoretries","",val_u_short},
|
|
/* 9 */ {"Autoretry delay, secs ","",val_u_short},
|
|
/* 10*/ {"Support NetWare/IP v1.1","Do NOT support NetWare/IP v1.1",yes_no},
|
|
/* 11*/ {"Primary DSS ", "" , special}
|
|
};
|
|
|
|
subopt = tvb_get_guint8(tvb, optp);
|
|
if (subopt > NUM_O63_SUBOPTS) {
|
|
proto_tree_add_text(v_tree, tvb,optp,1,"Unknown suboption %d", subopt);
|
|
optp++;
|
|
} else {
|
|
switch (o63_opt[subopt].ft) {
|
|
|
|
case string:
|
|
proto_tree_add_text(v_tree, tvb, optp, 2, "Suboption %d: %s", subopt, o63_opt[subopt].truet);
|
|
optp+=2;
|
|
break;
|
|
|
|
case yes_no:
|
|
if (tvb_get_guint8(tvb, optp+2)==1) {
|
|
proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s", subopt, o63_opt[subopt].truet);
|
|
} else {
|
|
proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s" , subopt, o63_opt[subopt].falset);
|
|
}
|
|
optp+=3;
|
|
break;
|
|
|
|
case special:
|
|
proto_tree_add_text(v_tree, tvb, optp, 6,
|
|
"Suboption %d: %s = %s" ,
|
|
subopt, o63_opt[subopt].truet,
|
|
ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
|
|
optp=optp+6;
|
|
break;
|
|
|
|
case val_u_short:
|
|
proto_tree_add_text(v_tree, tvb, optp, 3, "Suboption %d: %s = %u",
|
|
subopt, o63_opt[subopt].truet,
|
|
tvb_get_guint8(tvb, optp+2)); /* XXX - 1 byte? */
|
|
optp+=3;
|
|
break;
|
|
|
|
case ipv4:
|
|
subopt_len = tvb_get_guint8(tvb, optp+1);
|
|
if (subopt_len == 4) {
|
|
/* one IP address */
|
|
proto_tree_add_text(v_tree, tvb, optp, 6,
|
|
"Suboption %d : %s = %s",
|
|
subopt, o63_opt[subopt].truet,
|
|
ip_to_str(tvb_get_ptr(tvb, optp+2, 4)));
|
|
optp=optp+6;
|
|
} else {
|
|
/* > 1 IP addresses. Let's make a sub-tree */
|
|
vti = proto_tree_add_text(v_tree, tvb, optp,
|
|
subopt_len+2, "Suboption %d: %s",
|
|
subopt, o63_opt[subopt].truet);
|
|
o63_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
|
|
for (slask = optp + 2 ; slask < optp+subopt_len; slask += 4) {
|
|
proto_tree_add_text(o63_v_tree, tvb, slask, 4, "IP Address: %s",
|
|
ip_to_str(tvb_get_ptr(tvb, slask, 4)));
|
|
}
|
|
optp=slask;
|
|
}
|
|
break;
|
|
default:
|
|
proto_tree_add_text(v_tree, tvb,optp,1,"Unknown suboption %d", subopt);
|
|
optp++;
|
|
break;
|
|
}
|
|
}
|
|
return optp;
|
|
}
|
|
|
|
#define BOOTREQUEST 1
|
|
#define BOOTREPLY 2
|
|
|
|
static const value_string op_vals[] = {
|
|
{ BOOTREQUEST, "Boot Request" },
|
|
{ BOOTREPLY, "Boot Reply" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static void
|
|
dissect_bootp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_tree *bp_tree = NULL;
|
|
proto_item *ti;
|
|
guint8 op;
|
|
guint8 htype, hlen;
|
|
const guint8 *haddr;
|
|
int voff, eoff; /* vender offset, end offset */
|
|
guint32 ip_addr;
|
|
gboolean is_dhcp = FALSE;
|
|
const char *dhcp_type;
|
|
|
|
if (check_col(pinfo->fd, COL_PROTOCOL))
|
|
col_set_str(pinfo->fd, COL_PROTOCOL, "BOOTP");
|
|
if (check_col(pinfo->fd, COL_INFO)) {
|
|
/*
|
|
* In case we throw an exception fetching the opcode, etc.
|
|
*/
|
|
col_clear(pinfo->fd, COL_INFO);
|
|
}
|
|
|
|
op = tvb_get_guint8(tvb, 0);
|
|
htype = tvb_get_guint8(tvb, 1);
|
|
hlen = tvb_get_guint8(tvb, 2);
|
|
if (check_col(pinfo->fd, COL_INFO)) {
|
|
switch (op) {
|
|
|
|
case BOOTREQUEST:
|
|
col_add_fstr(pinfo->fd, COL_INFO, "Boot Request from %s",
|
|
arphrdaddr_to_str(tvb_get_ptr(tvb, 28, hlen),
|
|
hlen, htype));
|
|
break;
|
|
|
|
case BOOTREPLY:
|
|
col_set_str(pinfo->fd, COL_INFO, "Boot Reply");
|
|
break;
|
|
|
|
default:
|
|
col_add_fstr(pinfo->fd, COL_INFO, "Unknown BOOTP message type (%u)",
|
|
op);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_bootp, tvb, 0,
|
|
tvb_length(tvb), FALSE);
|
|
bp_tree = proto_item_add_subtree(ti, ett_bootp);
|
|
|
|
proto_tree_add_uint(bp_tree, hf_bootp_type, tvb,
|
|
0, 1,
|
|
op);
|
|
proto_tree_add_uint_format(bp_tree, hf_bootp_hw_type, tvb,
|
|
1, 1,
|
|
htype,
|
|
"Hardware type: %s",
|
|
arphrdtype_to_str(htype,
|
|
"Unknown (0x%02x)"));
|
|
proto_tree_add_uint(bp_tree, hf_bootp_hw_len, tvb,
|
|
2, 1, hlen);
|
|
proto_tree_add_item(bp_tree, hf_bootp_hops, tvb,
|
|
3, 1, FALSE);
|
|
proto_tree_add_item(bp_tree, hf_bootp_id, tvb,
|
|
4, 4, FALSE);
|
|
proto_tree_add_item(bp_tree, hf_bootp_secs, tvb,
|
|
8, 2, FALSE);
|
|
proto_tree_add_uint(bp_tree, hf_bootp_flag, tvb,
|
|
10, 2, tvb_get_ntohs(tvb, 10) & 0x8000);
|
|
|
|
proto_tree_add_item(bp_tree, hf_bootp_ip_client, tvb,
|
|
12, 4, FALSE);
|
|
proto_tree_add_item(bp_tree, hf_bootp_ip_your, tvb,
|
|
16, 4, FALSE);
|
|
proto_tree_add_item(bp_tree, hf_bootp_ip_server, tvb,
|
|
20, 4, FALSE);
|
|
proto_tree_add_item(bp_tree, hf_bootp_ip_relay, tvb,
|
|
24, 4, FALSE);
|
|
|
|
if (hlen > 0) {
|
|
haddr = tvb_get_ptr(tvb, 28, hlen);
|
|
proto_tree_add_bytes_format(bp_tree, hf_bootp_hw_addr, tvb,
|
|
28, hlen,
|
|
haddr,
|
|
"Client hardware address: %s",
|
|
arphrdaddr_to_str(haddr,
|
|
hlen,
|
|
htype));
|
|
}
|
|
else {
|
|
proto_tree_add_text(bp_tree, tvb,
|
|
28, 0, "Client address not given");
|
|
}
|
|
|
|
/* The server host name is optional */
|
|
if (tvb_get_guint8(tvb, 44) != '\0') {
|
|
proto_tree_add_item(bp_tree, hf_bootp_server, tvb,
|
|
44, 64, FALSE);
|
|
}
|
|
else {
|
|
proto_tree_add_string_format(bp_tree, hf_bootp_server, tvb,
|
|
44, 64,
|
|
tvb_get_ptr(tvb, 44, 1),
|
|
"Server host name not given");
|
|
}
|
|
|
|
/* Boot file */
|
|
if (tvb_get_guint8(tvb, 108) != '\0') {
|
|
proto_tree_add_item(bp_tree, hf_bootp_file, tvb,
|
|
108, 128, FALSE);
|
|
}
|
|
else {
|
|
proto_tree_add_string_format(bp_tree, hf_bootp_file, tvb,
|
|
108, 128,
|
|
tvb_get_ptr(tvb, 108, 1),
|
|
"Boot file name not given");
|
|
}
|
|
|
|
tvb_memcpy(tvb, (void *)&ip_addr, 236, sizeof(ip_addr));
|
|
if (tvb_get_ntohl(tvb, 236) == 0x63825363) {
|
|
proto_tree_add_ipv4_format(bp_tree, hf_bootp_cookie, tvb,
|
|
236, 4, ip_addr,
|
|
"Magic cookie: (OK)");
|
|
}
|
|
else {
|
|
proto_tree_add_ipv4(bp_tree, hf_bootp_cookie, tvb,
|
|
236, 4, ip_addr);
|
|
}
|
|
}
|
|
|
|
voff = 240;
|
|
eoff = tvb_reported_length(tvb);
|
|
while (voff < eoff) {
|
|
/* Handle the DHCP option specially here, so that we
|
|
can flag DHCP packets as such. */
|
|
if (!is_dhcp && tvb_get_guint8(tvb, voff) == 53) {
|
|
/*
|
|
* We haven't already seen a DHCP Type option, and
|
|
* this is a DHCP Type option, so flag this packet
|
|
* as DHCP.
|
|
*/
|
|
dhcp_type = get_dhcp_type(tvb_get_guint8(tvb, voff+2));
|
|
if (check_col(pinfo->fd, COL_PROTOCOL))
|
|
col_set_str(pinfo->fd, COL_PROTOCOL, "DHCP");
|
|
if (check_col(pinfo->fd, COL_INFO))
|
|
col_add_fstr(pinfo->fd, COL_INFO, "DHCP %-8s - Transaction ID 0x%x",
|
|
dhcp_type, tvb_get_ntohl(tvb, 4));
|
|
if (tree)
|
|
proto_tree_add_boolean_hidden(bp_tree, hf_bootp_dhcp,
|
|
tvb, 0, 0, 1);
|
|
is_dhcp = TRUE;
|
|
}
|
|
voff += bootp_option(tvb, bp_tree, voff, eoff);
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_bootp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_bootp_dhcp,
|
|
{ "Frame is DHCP", "bootp.dhcp", FT_BOOLEAN,
|
|
BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_type,
|
|
{ "Message type", "bootp.type", FT_UINT8,
|
|
BASE_DEC, VALS(op_vals), 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_hw_type,
|
|
{ "Hardware type", "bootp.hw.type", FT_UINT8,
|
|
BASE_HEX, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_hw_len,
|
|
{ "Hardware address length", "bootp.hw.len", FT_UINT8,
|
|
BASE_DEC, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_hops,
|
|
{ "Hops", "bootp.hops", FT_UINT8,
|
|
BASE_DEC, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_id,
|
|
{ "Transaction ID", "bootp.id", FT_UINT32,
|
|
BASE_HEX, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_secs,
|
|
{ "Seconds elapsed", "bootp.secs", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_flag,
|
|
{ "Broadcast flag", "bootp.flag", FT_UINT16,
|
|
BASE_HEX, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_ip_client,
|
|
{ "Client IP address", "bootp.ip.client",FT_IPv4,
|
|
BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_ip_your,
|
|
{ "Your (client) IP address", "bootp.ip.your", FT_IPv4,
|
|
BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_ip_server,
|
|
{ "Next server IP address", "bootp.ip.server",FT_IPv4,
|
|
BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_ip_relay,
|
|
{ "Relay agent IP address", "bootp.ip.relay", FT_IPv4,
|
|
BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_hw_addr,
|
|
{ "Client hardware address", "bootp.hw.addr", FT_BYTES,
|
|
BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_server,
|
|
{ "Server host name", "bootp.server", FT_STRING,
|
|
BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_file,
|
|
{ "Boot file name", "bootp.file", FT_STRING,
|
|
BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
|
|
{ &hf_bootp_cookie,
|
|
{ "Magic cookie", "bootp.cookie", FT_IPv4,
|
|
BASE_NONE, NULL, 0x0,
|
|
"" }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_bootp,
|
|
&ett_bootp_option,
|
|
};
|
|
|
|
proto_bootp = proto_register_protocol("Bootstrap Protocol", "BOOTP/DHCP",
|
|
"bootp");
|
|
proto_register_field_array(proto_bootp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_bootp(void)
|
|
{
|
|
dissector_add("udp.port", UDP_PORT_BOOTPS, dissect_bootp, proto_bootp);
|
|
}
|