forked from osmocom/wireshark
539 lines
16 KiB
C
539 lines
16 KiB
C
/* packet-bootp.c
|
|
* Routines for BOOTP/DHCP packet disassembly
|
|
* Gilbert Ramirez <gram@verdict.uthscsa.edu>
|
|
*
|
|
* $Id: packet-bootp.c,v 1.19 1999/08/26 07:34:43 guy Exp $
|
|
*
|
|
* The information used comes from:
|
|
* RFC 2132: DHCP Options and BOOTP Vendor Extensions
|
|
* RFC 1542: Clarifications and Extensions for the Bootstrap Protocol
|
|
* RFC 2131: Dynamic Host Configuration Protocol
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@unicom.net>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
*
|
|
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_TYPES_H
|
|
# include <sys/types.h>
|
|
#endif
|
|
|
|
#include <glib.h>
|
|
#include "packet.h"
|
|
|
|
static int proto_bootp = -1;
|
|
|
|
enum field_type { none, ipv4, string, toggle, yes_no, special, opaque,
|
|
time_in_secs,
|
|
val_u_byte, val_u_short, val_u_long,
|
|
val_s_long };
|
|
|
|
struct opt_info {
|
|
char *text;
|
|
enum field_type ftype;
|
|
};
|
|
|
|
#define NUM_OPT_INFOS 77
|
|
|
|
/* returns the number of bytes consumed by this option */
|
|
static int
|
|
bootp_option(const u_char *pd, proto_tree *bp_tree, int voff, int eoff)
|
|
{
|
|
char *text;
|
|
enum field_type ftype;
|
|
u_char code = pd[voff];
|
|
int vlen = pd[voff+1];
|
|
u_char byte;
|
|
int i, consumed = vlen + 2;
|
|
u_long time_secs;
|
|
proto_tree *v_tree;
|
|
proto_item *vti;
|
|
|
|
static const char *opt53_text[] = {
|
|
"Unknown Message Type",
|
|
"Discover",
|
|
"Offer",
|
|
"Request",
|
|
"Decline",
|
|
"ACK",
|
|
"NAK",
|
|
"Release",
|
|
"Inform"
|
|
};
|
|
static const value_string nbnt_vals[] = {
|
|
{0x1, "B-node" },
|
|
{0x2, "P-node" },
|
|
{0x4, "M-node" },
|
|
{0x8, "H-node" },
|
|
{0, NULL } };
|
|
|
|
static struct opt_info opt[] = {
|
|
/* 0 */ { "Padding", none },
|
|
/* 1 */ { "Subnet Mask", ipv4 },
|
|
/* 2 */ { "Time Offset", val_s_long },
|
|
/* 3 */ { "Router", ipv4 },
|
|
/* 4 */ { "Time Server", ipv4 },
|
|
/* 5 */ { "Name Server", ipv4 },
|
|
/* 6 */ { "Domain Name Server", ipv4 },
|
|
/* 7 */ { "Log Server", ipv4 },
|
|
/* 8 */ { "Cookie Server", ipv4 },
|
|
/* 9 */ { "LPR Server", ipv4 },
|
|
/* 10 */ { "Impress Server", ipv4 },
|
|
/* 11 */ { "Resource Location Server", ipv4 },
|
|
/* 12 */ { "Host Name", string },
|
|
/* 13 */ { "Boot File Size", val_u_short },
|
|
/* 14 */ { "Merit Dump File", string },
|
|
/* 15 */ { "Domain Name", string },
|
|
/* 16 */ { "Swap Server", ipv4 },
|
|
/* 17 */ { "Root Path", string },
|
|
/* 18 */ { "Extensions Path", string },
|
|
/* 19 */ { "IP Forwarding", toggle },
|
|
/* 20 */ { "Non-Local Source Routing", toggle },
|
|
/* 21 */ { "Policy Filter", special },
|
|
/* 22 */ { "Maximum Datagram Reassembly Size", val_u_short },
|
|
/* 23 */ { "Default IP Time-to-Live", val_u_byte },
|
|
/* 24 */ { "Path MTU Aging Timeout", time_in_secs },
|
|
/* 25 */ { "Path MTU Plateau Table", val_u_short },
|
|
/* 26 */ { "Interface MTU", val_u_short },
|
|
/* 27 */ { "All Subnets are Local", yes_no },
|
|
/* 28 */ { "Broadcast Address", ipv4 },
|
|
/* 29 */ { "Perform Mask Discovery", toggle },
|
|
/* 30 */ { "Mask Supplier", yes_no },
|
|
/* 31 */ { "Perform Router Discover", toggle },
|
|
/* 32 */ { "Router Solicitation Address", ipv4 },
|
|
/* 33 */ { "Static Route", special },
|
|
/* 34 */ { "Trailer Encapsulation", toggle },
|
|
/* 35 */ { "ARP Cache Timeout", time_in_secs },
|
|
/* 36 */ { "Ethernet Encapsulation", toggle },
|
|
/* 37 */ { "TCP Default TTL", val_u_byte },
|
|
/* 38 */ { "TCP Keepalive Interval", time_in_secs },
|
|
/* 39 */ { "TCP Keepalive Garbage", toggle },
|
|
/* 40 */ { "Network Information Service Domain", string },
|
|
/* 41 */ { "Network Information Service Servers", ipv4 },
|
|
/* 42 */ { "Network Time Protocol Servers", ipv4 },
|
|
/* 43 */ { "Vendor-Specific Information", special },
|
|
/* 44 */ { "NetBIOS over TCP/IP Name Server", ipv4 },
|
|
/* 45 */ { "NetBIOS over TCP/IP Datagram Distribution Name Server", ipv4 },
|
|
/* 46 */ { "NetBIOS over TCP/IP Node Type", special },
|
|
/* 47 */ { "NetBIOS over TCP/IP Scope", string },
|
|
/* 48 */ { "X Window System Font Server", ipv4 },
|
|
/* 49 */ { "X Window System Display Manager", ipv4 },
|
|
/* 50 */ { "Requested IP Address", ipv4 },
|
|
/* 51 */ { "IP Address Lease Time", time_in_secs },
|
|
/* 52 */ { "Option Overload", special },
|
|
/* 53 */ { "DHCP Message Type", special },
|
|
/* 54 */ { "Server Identifier", ipv4 },
|
|
/* 55 */ { "Parameter Request List", special },
|
|
/* 56 */ { "Message", string },
|
|
/* 57 */ { "Maximum DHCP Message Size", val_u_short },
|
|
/* 58 */ { "Renewal Time Value", time_in_secs },
|
|
/* 59 */ { "Rebinding Time Value", time_in_secs },
|
|
/* 60 */ { "Vendor class identifier", opaque },
|
|
/* 61 */ { "Client identifier", special },
|
|
/* 64 */ { "Network Information Service+ Domain", string },
|
|
/* 65 */ { "Network Information Service+ Servers", ipv4 },
|
|
/* 66 */ { "TFTP Server Name", string },
|
|
/* 67 */ { "Bootfile name", string },
|
|
/* 68 */ { "Mobile IP Home Agent", ipv4 },
|
|
/* 69 */ { "SMTP Server", ipv4 },
|
|
/* 70 */ { "POP3 Server", ipv4 },
|
|
/* 71 */ { "NNTP Server", ipv4 },
|
|
/* 72 */ { "Default WWW Server", ipv4 },
|
|
/* 73 */ { "Default Finger Server", ipv4 },
|
|
/* 74 */ { "Default IRC Server", ipv4 },
|
|
/* 75 */ { "StreetTalk Server", ipv4 },
|
|
/* 76 */ { "StreetTalk Directory Assistance Server", ipv4 }
|
|
};
|
|
|
|
text = opt[code].text;
|
|
/* Special cases */
|
|
switch (code) {
|
|
/* Padding */
|
|
case 0:
|
|
/* check how much padding we have */
|
|
for (i = voff + 1; i < eoff; i++ ) {
|
|
if (pd[i] != 0) {
|
|
break;
|
|
}
|
|
}
|
|
i = i - voff;
|
|
proto_tree_add_text(bp_tree, voff, i, "Padding");
|
|
consumed = i;
|
|
return consumed;
|
|
|
|
/* Policy Filter */
|
|
case 21:
|
|
/* one IP address pair */
|
|
if (vlen == 8) {
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = %s/%s", code, text,
|
|
ip_to_str((guint8*)&pd[voff+2]),
|
|
ip_to_str((guint8*)&pd[voff+6]));
|
|
}
|
|
/* > 1 IP address pair. Let's make a sub-tree */
|
|
else {
|
|
|
|
vti = proto_tree_add_text(bp_tree, 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 += 8) {
|
|
proto_tree_add_text(v_tree, i, 8, "IP Address/Mask: %s/%s",
|
|
ip_to_str((guint8*)&pd[i]),
|
|
ip_to_str((guint8*)&pd[i+4]));
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* Static Route */
|
|
case 33:
|
|
/* one IP address pair */
|
|
if (vlen == 8) {
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = %s/%s", code, text,
|
|
ip_to_str((guint8*)&pd[voff+2]),
|
|
ip_to_str((guint8*)&pd[voff+6]));
|
|
}
|
|
/* > 1 IP address pair. Let's make a sub-tree */
|
|
else {
|
|
|
|
vti = proto_tree_add_text(bp_tree, 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 += 8) {
|
|
proto_tree_add_text(v_tree, i, 8,
|
|
"Destination IP Address/Router: %s/%s",
|
|
ip_to_str((guint8*)&pd[i]),
|
|
ip_to_str((guint8*)&pd[i+4]));
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* Vendor-Specific Info */
|
|
case 43:
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s", code, text);
|
|
break;
|
|
|
|
/* NetBIOS-over-TCP/IP Node Type */
|
|
case 46:
|
|
byte = pd[voff+2];
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = %s", code, text,
|
|
val_to_str(byte, nbnt_vals,
|
|
"Unknown (0x%02x)"));
|
|
break;
|
|
|
|
/* DHCP Message Type */
|
|
case 53:
|
|
byte = pd[voff+2];
|
|
if (byte > 0 && byte < 9) {
|
|
i = byte;
|
|
}
|
|
else {
|
|
i = 0;
|
|
}
|
|
proto_tree_add_text(bp_tree, voff, 3, "Option %d: %s = DHCP %s",
|
|
code, text, opt53_text[i]);
|
|
break;
|
|
|
|
/* Parameter Request List */
|
|
case 55:
|
|
vti = proto_tree_add_text(bp_tree, voff,
|
|
vlen + 2, "Option %d: %s", code, text);
|
|
v_tree = proto_item_add_subtree(vti, ETT_BOOTP_OPTION);
|
|
for (i = 0; i < vlen; i++) {
|
|
byte = pd[voff+2+i];
|
|
if (byte < NUM_OPT_INFOS) {
|
|
proto_tree_add_text(v_tree, voff+2+i, 1, "%d = %s",
|
|
byte, opt[byte].text);
|
|
}
|
|
else {
|
|
proto_tree_add_text(vti, voff+2+i, 1,
|
|
"Unknown Option Code: %d", byte);
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* Client Identifier */
|
|
case 61:
|
|
/* We *MAY* use hwtype/hwaddr. If we have 7 bytes, I'll
|
|
guess that the first is the hwtype, and the last 6 are
|
|
the hw addr */
|
|
if (vlen == 7) {
|
|
vti = proto_tree_add_text(bp_tree, voff,
|
|
consumed, "Option %d: %s", code, text);
|
|
v_tree = proto_item_add_subtree(vti, ETT_BOOTP_OPTION);
|
|
proto_tree_add_text(v_tree, voff+2, 1,
|
|
"Hardware type: %s",
|
|
arphrdtype_to_str(pd[voff+2],
|
|
"Unknown (0x%02x)"));
|
|
proto_tree_add_text(v_tree, voff+3, 6,
|
|
"Client hardware address: %s",
|
|
arphrdaddr_to_str((guint8*)&pd[voff+3],
|
|
6, pd[voff+2]));
|
|
}
|
|
/* otherwise, it's opaque data */
|
|
else {
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s (%d bytes)", code, text, vlen);
|
|
}
|
|
break;
|
|
|
|
/* End Option */
|
|
case 255:
|
|
proto_tree_add_text(bp_tree, voff, 1, "End Option");
|
|
consumed = 1;
|
|
return consumed;
|
|
|
|
default:
|
|
/* nothing */
|
|
break;
|
|
}
|
|
|
|
/* Normal cases */
|
|
if (code < NUM_OPT_INFOS) {
|
|
text = opt[code].text;
|
|
ftype = opt[code].ftype;
|
|
|
|
switch (ftype) {
|
|
case special:
|
|
return consumed;
|
|
|
|
case ipv4:
|
|
/* one IP address */
|
|
if (vlen == 4) {
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = %s", code, text,
|
|
ip_to_str((guint8*)&pd[voff+2]));
|
|
}
|
|
/* > 1 IP addresses. Let's make a sub-tree */
|
|
else {
|
|
|
|
vti = proto_tree_add_text(bp_tree, 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, i, 4, "IP Address: %s",
|
|
ip_to_str((guint8*)&pd[i]));
|
|
}
|
|
}
|
|
break;
|
|
|
|
case string:
|
|
/* Fix for non null-terminated string supplied by
|
|
* John Lines <John.Lines@aeat.co.uk>
|
|
*/
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = %.*s", code, text, vlen, &pd[voff+2]);
|
|
break;
|
|
|
|
case opaque:
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s (%d bytes)",
|
|
code, text, vlen);
|
|
break;
|
|
|
|
case val_u_short:
|
|
/* one IP address */
|
|
if (vlen == 2) {
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = %d", code, text,
|
|
pntohs(&pd[voff+2]));
|
|
}
|
|
/* > 1 u_short */
|
|
else {
|
|
vti = proto_tree_add_text(bp_tree, 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, i, 4, "Value: %d",
|
|
pntohs(&pd[i]));
|
|
}
|
|
}
|
|
break;
|
|
|
|
case val_u_long:
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = %d", code, text,
|
|
pntohl(&pd[voff+2]));
|
|
break;
|
|
|
|
case val_u_byte:
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = %d", code, text, pd[voff+2]);
|
|
break;
|
|
|
|
case toggle:
|
|
i = pd[voff+2];
|
|
if (i != 0 && i != 1) {
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = Invalid Value %d", code, text,
|
|
pd[voff+2]);
|
|
}
|
|
else {
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = %s", code, text,
|
|
pd[voff+2] == 0 ? "Disabled" : "Enabled");
|
|
}
|
|
break;
|
|
|
|
case yes_no:
|
|
i = pd[voff+2];
|
|
if (i != 0 && i != 1) {
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = Invalid Value %d", code, text,
|
|
pd[voff+2]);
|
|
}
|
|
else {
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Option %d: %s = %s", code, text,
|
|
pd[voff+2] == 0 ? "No" : "Yes");
|
|
}
|
|
break;
|
|
|
|
case time_in_secs:
|
|
time_secs = pntohl(&pd[voff+2]);
|
|
proto_tree_add_text(bp_tree, 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, voff, consumed,
|
|
"Option %d: %s (%d bytes)", code, text, vlen);
|
|
}
|
|
}
|
|
else {
|
|
proto_tree_add_text(bp_tree, voff, consumed,
|
|
"Unknown Option Code: %d (%d bytes)", code, vlen);
|
|
}
|
|
|
|
return consumed;
|
|
}
|
|
|
|
void
|
|
dissect_bootp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
|
|
{
|
|
proto_tree *bp_tree;
|
|
proto_item *ti;
|
|
int voff, eoff; /* vender offset, end offset */
|
|
|
|
if (check_col(fd, COL_PROTOCOL))
|
|
col_add_str(fd, COL_PROTOCOL, "BOOTP");
|
|
|
|
if (check_col(fd, COL_INFO)) {
|
|
if (pd[offset] == 1) {
|
|
col_add_fstr(fd, COL_INFO, "Boot Request from %s",
|
|
arphrdaddr_to_str((guint8*)&pd[offset+28],
|
|
pd[offset+2], pd[offset+1]));
|
|
}
|
|
else {
|
|
col_add_str(fd, COL_INFO, "Boot Reply");
|
|
}
|
|
}
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_bootp, offset, END_OF_FRAME, NULL);
|
|
bp_tree = proto_item_add_subtree(ti, ETT_BOOTP);
|
|
|
|
proto_tree_add_text(bp_tree, offset, 1, pd[offset] == 1 ?
|
|
"Boot Request" : "Boot Reply");
|
|
proto_tree_add_text(bp_tree, offset + 1, 1,
|
|
"Hardware type: %s",
|
|
arphrdtype_to_str(pd[offset+1], "Unknown (0x%02x)"));
|
|
proto_tree_add_text(bp_tree, offset + 2, 1,
|
|
"Hardware address length: %d", pd[offset+2]);
|
|
proto_tree_add_text(bp_tree, offset + 3, 1,
|
|
"Hops: %d", pd[offset+3]);
|
|
proto_tree_add_text(bp_tree, offset + 4, 4,
|
|
"Transaction ID: 0x%08x", pntohl(&pd[offset+4]));
|
|
proto_tree_add_text(bp_tree, offset + 8, 2,
|
|
"Seconds elapsed: %d", pntohs(&pd[offset+8]));
|
|
proto_tree_add_text(bp_tree, offset + 10, 2,
|
|
"Broadcast flag: %d", pd[offset+10] & 1);
|
|
proto_tree_add_text(bp_tree, offset + 12, 4,
|
|
"Client IP address: %s", ip_to_str((guint8*)&pd[offset+12]));
|
|
proto_tree_add_text(bp_tree, offset + 16, 4,
|
|
"Your (client) IP address: %s", ip_to_str((guint8*)&pd[offset+16]));
|
|
proto_tree_add_text(bp_tree, offset + 20, 4,
|
|
"Next server IP address: %s", ip_to_str((guint8*)&pd[offset+20]));
|
|
proto_tree_add_text(bp_tree, offset + 24, 4,
|
|
"Relay agent IP address: %s", ip_to_str((guint8*)&pd[offset+24]));
|
|
|
|
proto_tree_add_text(bp_tree, offset + 28, pd[offset+2],
|
|
"Client hardware address: %s",
|
|
arphrdaddr_to_str((guint8*)&pd[offset+28],
|
|
pd[offset+2], pd[offset+1]));
|
|
|
|
/* The server host name is optional */
|
|
if (pd[offset+44]) {
|
|
proto_tree_add_text(bp_tree, offset + 44, 64,
|
|
"Server host name: %s", &pd[offset+44]);
|
|
}
|
|
else {
|
|
proto_tree_add_text(bp_tree, offset + 44, 64,
|
|
"Server host name not given");
|
|
}
|
|
|
|
/* Boot file */
|
|
if (pd[offset+108]) {
|
|
proto_tree_add_text(bp_tree, offset + 108, 128,
|
|
"Boot file name: %s", &pd[offset+108]);
|
|
}
|
|
else {
|
|
proto_tree_add_text(bp_tree, offset + 108, 128,
|
|
"Boot file name not given");
|
|
}
|
|
|
|
if (pntohl(&pd[offset+236]) == 0x63825363) {
|
|
proto_tree_add_text(bp_tree, offset + 236, 4,
|
|
"Magic cookie: (OK)");
|
|
}
|
|
else {
|
|
proto_tree_add_text(bp_tree, offset + 236, 4,
|
|
"Magic cookie: %s",
|
|
ip_to_str((guint8*)&pd[offset+236]));
|
|
}
|
|
|
|
voff = offset+240;
|
|
eoff = pi.captured_len;
|
|
|
|
while (voff < eoff) {
|
|
voff += bootp_option(pd, bp_tree, voff, eoff);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_bootp(void)
|
|
{
|
|
/* static hf_register_info hf[] = {
|
|
{ &variable,
|
|
{ "Name", "bootp.abbreviation", TYPE, VALS_POINTER }},
|
|
};*/
|
|
|
|
proto_bootp = proto_register_protocol("Bootstrap Protocol", "bootp");
|
|
/* proto_register_field_array(proto_bootp, hf, array_length(hf));*/
|
|
}
|