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wireshark/packet-bootp.c

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/* packet-bootp.c
* Routines for BOOTP/DHCP packet disassembly
* Gilbert Ramirez <gram@xiexie.org>
*
* $Id: packet-bootp.c,v 1.40 2000/08/13 14:08:03 deniel Exp $
*
* The information used comes from:
* RFC 951: Bootstrap Protocol
* RFC 1542: Clarifications and Extensions for the Bootstrap Protocol
* RFC 2131: Dynamic Host Configuration Protocol
* RFC 2132: DHCP Options and BOOTP Vendor Extensions
* RFC 2489: Procedure for Defining New DHCP Options
* BOOTP and DHCP Parameters
* http://www.isi.edu/in-notes/iana/assignments/bootp-dhcp-parameters
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* 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"
#include "packet-arp.h"
static int proto_bootp = -1;
static int hf_bootp_type = -1;
static int hf_bootp_hw_type = -1;
static int hf_bootp_hw_len = -1;
static int hf_bootp_hops = -1;
static int hf_bootp_id = -1;
static int hf_bootp_secs = -1;
static int hf_bootp_flag = -1;
static int hf_bootp_ip_client = -1;
static int hf_bootp_ip_your = -1;
static int hf_bootp_ip_server = -1;
static int hf_bootp_ip_relay = -1;
static int hf_bootp_hw_addr = -1;
static int hf_bootp_server = -1;
static int hf_bootp_file = -1;
static int hf_bootp_cookie = -1;
static int hf_bootp_dhcp = -1;
static guint ett_bootp = -1;
static guint ett_bootp_option = -1;
#define UDP_PORT_BOOTPS 67
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 128
#define NUM_O63_SUBOPTS 11
static int dissect_netware_ip_suboption(proto_tree *v_tree, const u_char *pd,
int optp);
static const char *
get_dhcp_type(guint8 byte)
{
static const char *opt53_text[] = {
"Unknown Message Type",
"Discover",
"Offer",
"Request",
"Decline",
"ACK",
"NAK",
"Release",
"Inform"
};
int i;
if (byte > 0 && byte < (sizeof opt53_text / sizeof opt53_text[0]))
i = byte;
else
i = 0;
return opt53_text[i];
}
/* 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,optp, consumed = vlen + 2;
u_long time_secs;
proto_tree *v_tree;
proto_item *vti;
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 },
/* 62 */ { "Novell/Netware IP domain", string },
/* 63 */ { "Novell Options", 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 },
/* 77 */ { "User Class Information", opaque },
/* 78 */ { "Directory Agent Information", opaque },
/* 79 */ { "Service Location Agent Scope", opaque },
/* 80 */ { "Naming Authority", opaque },
/* 81 */ { "Client Fully Qualified Domain Name", opaque },
/* 82 */ { "Agent Circuit ID", opaque },
/* 83 */ { "Agent Remote ID", opaque },
/* 84 */ { "Agent Subnet Mask", opaque },
/* 85 */ { "Novell Directory Services Servers", opaque },
/* 86 */ { "Novell Directory Services Tree Name", opaque },
/* 87 */ { "Novell Directory Services Context", opaque },
/* 88 */ { "IEEE 1003.1 POSIX Timezone", opaque },
/* 89 */ { "Fully Qualified Domain Name", opaque },
/* 90 */ { "Authentication", opaque },
/* 91 */ { "Vines TCP/IP Server Option", opaque },
/* 92 */ { "Server Selection Option", opaque },
/* 93 */ { "Client System Architecture", opaque },
/* 94 */ { "Client Network Device Interface", opaque },
/* 95 */ { "Lightweight Directory Access Protocol", opaque },
/* 96 */ { "IPv6 Transitions", opaque },
/* 97 */ { "UUID/GUID-based Client Identifier", opaque },
/* 98 */ { "Open Group's User Authentication", opaque },
/* 99 */ { "Unassigned", opaque },
/* 100 */ { "Printer Name", opaque },
/* 101 */ { "MDHCP multicast address", opaque },
/* 102 */ { "Removed/unassigned", opaque },
/* 103 */ { "Removed/unassigned", opaque },
/* 104 */ { "Removed/unassigned", opaque },
/* 105 */ { "Removed/unassigned", opaque },
/* 106 */ { "Removed/unassigned", opaque },
/* 107 */ { "Removed/unassigned", opaque },
/* 108 */ { "Swap Path Option", opaque },
/* 109 */ { "Unassigned", opaque },
/* 110 */ { "IPX Compability", opaque },
/* 111 */ { "Unassigned", opaque },
/* 112 */ { "Netinfo Parent Server Address", opaque },
/* 113 */ { "Netinfo Parent Server Tag", opaque },
/* 114 */ { "URL", opaque },
/* 115 */ { "DHCP Failover Protocol", opaque },
/* 116 */ { "DHCP Auto-Configuration", opaque },
/* 117 */ { "Unassigned", opaque },
/* 118 */ { "Unassigned", opaque },
/* 119 */ { "Unassigned", opaque },
/* 120 */ { "Unassigned", opaque },
/* 121 */ { "Unassigned", opaque },
/* 122 */ { "Unassigned", opaque },
/* 123 */ { "Unassigned", opaque },
/* 124 */ { "Unassigned", opaque },
/* 125 */ { "Unassigned", opaque },
/* 126 */ { "Extension", opaque },
/* 127 */ { "Extension", opaque }
};
/* Options whose length isn't "vlen + 2". */
switch (code) {
case 0: /* Padding */
/* check how much padding we have */
for (i = voff + 1; i < eoff; i++ ) {
if (pd[i] != 0) {
break;
}
}
i = i - voff;
if (bp_tree != NULL)
proto_tree_add_text(bp_tree, NullTVB, voff, i, "Padding");
consumed = i;
return consumed;
break;
case 255: /* End Option */
if (bp_tree != NULL)
proto_tree_add_text(bp_tree, NullTVB, voff, 1, "End Option");
consumed = 1;
return consumed;
}
if (bp_tree == NULL) {
/* Don't put anything in the protocol tree. */
return consumed;
}
text = opt[code].text;
/* Special cases */
switch (code) {
case 21: /* Policy Filter */
if (vlen == 8) {
/* one IP address pair */
proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
"Option %d: %s = %s/%s", code, text,
ip_to_str((guint8*)&pd[voff+2]),
ip_to_str((guint8*)&pd[voff+6]));
} else {
/* > 1 IP address pair. Let's make a sub-tree */
vti = proto_tree_add_text(bp_tree, NullTVB, 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, NullTVB, i, 8, "IP Address/Mask: %s/%s",
ip_to_str((guint8*)&pd[i]),
ip_to_str((guint8*)&pd[i+4]));
}
}
break;
case 33: /* Static Route */
if (vlen == 8) {
/* one IP address pair */
proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
"Option %d: %s = %s/%s", code, text,
ip_to_str((guint8*)&pd[voff+2]),
ip_to_str((guint8*)&pd[voff+6]));
} else {
/* > 1 IP address pair. Let's make a sub-tree */
vti = proto_tree_add_text(bp_tree, NullTVB, 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, NullTVB, i, 8,
"Destination IP Address/Router: %s/%s",
ip_to_str((guint8*)&pd[i]),
ip_to_str((guint8*)&pd[i+4]));
}
}
break;
case 43: /* Vendor-Specific Info */
proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
"Option %d: %s", code, text);
break;
case 46: /* NetBIOS-over-TCP/IP Node Type */
byte = pd[voff+2];
proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
"Option %d: %s = %s", code, text,
val_to_str(byte, nbnt_vals,
"Unknown (0x%02x)"));
break;
case 53: /* DHCP Message Type */
proto_tree_add_text(bp_tree, NullTVB, voff, 3, "Option %d: %s = DHCP %s",
code, text, get_dhcp_type(pd[voff+2]));
break;
case 55: /* Parameter Request List */
vti = proto_tree_add_text(bp_tree, NullTVB, 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, NullTVB, voff+2+i, 1, "%d = %s",
byte, opt[byte].text);
} else {
proto_tree_add_text(vti, NullTVB, voff+2+i, 1,
"Unknown Option Code: %d", byte);
}
}
break;
case 61: /* Client Identifier */
/* 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, NullTVB, voff,
consumed, "Option %d: %s", code, text);
v_tree = proto_item_add_subtree(vti, ett_bootp_option);
proto_tree_add_text(v_tree, NullTVB, voff+2, 1,
"Hardware type: %s",
arphrdtype_to_str(pd[voff+2],
"Unknown (0x%02x)"));
proto_tree_add_text(v_tree, NullTVB, voff+3, 6,
"Client hardware address: %s",
arphrdaddr_to_str((guint8*)&pd[voff+3],
6, pd[voff+2]));
} else {
/* otherwise, it's opaque data */
proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
"Option %d: %s (%d bytes)", code, text, vlen);
}
break;
case 63: /* NetWare/IP options */
vti = proto_tree_add_text(bp_tree, NullTVB, voff,
consumed, "Option %d: %s", code, text);
v_tree = proto_item_add_subtree(vti, ett_bootp_option);
optp = voff+2;
while (optp < voff+consumed)
optp = dissect_netware_ip_suboption(v_tree, pd, optp);
break;
default: /* not special */
break;
}
/* Normal cases */
if (code < NUM_OPT_INFOS) {
text = opt[code].text;
ftype = opt[code].ftype;
switch (ftype) {
case special:
return consumed;
case ipv4:
if (vlen == 4) {
/* one IP address */
proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
"Option %d: %s = %s", code, text,
ip_to_str((guint8*)&pd[voff+2]));
} else {
/* > 1 IP addresses. Let's make a sub-tree */
vti = proto_tree_add_text(bp_tree, NullTVB, 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, NullTVB, 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, NullTVB, voff, consumed,
"Option %d: %s = %.*s", code, text, vlen, &pd[voff+2]);
break;
case opaque:
proto_tree_add_text(bp_tree, NullTVB, 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, NullTVB, voff, consumed,
"Option %d: %s = %d", code, text,
pntohs(&pd[voff+2]));
} else {
/* > 1 u_short */
vti = proto_tree_add_text(bp_tree, NullTVB, 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, NullTVB, i, 4, "Value: %d",
pntohs(&pd[i]));
}
}
break;
case val_u_long:
proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
"Option %d: %s = %d", code, text,
pntohl(&pd[voff+2]));
break;
case val_u_byte:
proto_tree_add_text(bp_tree, NullTVB, 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, NullTVB, voff, consumed,
"Option %d: %s = Invalid Value %d", code, text,
pd[voff+2]);
} else {
proto_tree_add_text(bp_tree, NullTVB, 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, NullTVB, voff, consumed,
"Option %d: %s = Invalid Value %d", code, text,
pd[voff+2]);
} else {
proto_tree_add_text(bp_tree, NullTVB, 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, NullTVB, 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, NullTVB, voff, consumed,
"Option %d: %s (%d bytes)", code, text, vlen);
}
} else {
proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
"Unknown Option Code: %d (%d bytes)", code, vlen);
}
return consumed;
}
static int
dissect_netware_ip_suboption(proto_tree *v_tree, const u_char *pd, int optp)
{
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}
};
if (pd[optp] > NUM_O63_SUBOPTS) {
proto_tree_add_text(v_tree, NullTVB,optp,1,"Unknown suboption %d", pd[optp]);
optp++;
} else {
switch (o63_opt[pd[optp]].ft) {
case string:
proto_tree_add_text(v_tree, NullTVB, optp, 2, "Suboption %d: %s", pd[optp], o63_opt[pd[optp]].truet);
optp+=2;
break;
case yes_no:
if (pd[optp+2]==1) {
proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s", pd[optp], o63_opt[pd[optp]].truet);
} else {
proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s" , pd[optp], o63_opt[pd[optp]].falset);
}
optp+=3;
break;
case special:
proto_tree_add_text(v_tree, NullTVB, optp, 6,
"Suboption %d: %s = %s" ,
pd[optp], o63_opt[pd[optp]].truet,
ip_to_str((guint8*)&pd[optp+2]));
optp=optp+6;
break;
case val_u_short:
proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s = %d",pd[optp], o63_opt[pd[optp]].truet, pd[optp+2]);
optp+=3;
break;
case ipv4:
if (pd[optp+1] == 4) {
/* one IP address */
proto_tree_add_text(v_tree, NullTVB, optp, 6,
"Suboption %d : %s = %s",
pd[optp], o63_opt[pd[optp]].truet,
ip_to_str((guint8*)&pd[optp+2]));
optp=optp+6;
} else {
/* > 1 IP addresses. Let's make a sub-tree */
vti = proto_tree_add_text(v_tree, NullTVB, optp,
pd[optp+1]+2, "Suboption %d: %s",
pd[optp], o63_opt[pd[optp]].truet);
o63_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
for (slask = optp + 2 ; slask < optp+pd[optp+1]; slask += 4) {
proto_tree_add_text(o63_v_tree, NullTVB, slask, 4, "IP Address: %s",
ip_to_str((guint8*)&pd[slask]));
}
optp=slask;
}
break;
default:
proto_tree_add_text(v_tree, NullTVB,optp,1,"Unknown suboption %d", pd[optp]);
optp++;
break;
}
}
return optp;
}
static void
dissect_bootp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
{
proto_tree *bp_tree = NULL;
proto_item *ti;
int voff, eoff; /* vender offset, end offset */
guint32 ip_addr;
const char *dhcp_type;
OLD_CHECK_DISPLAY_AS_DATA(proto_bootp, pd, offset, fd, tree);
dhcp_type = NULL;
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, NullTVB, offset, END_OF_FRAME, FALSE);
bp_tree = proto_item_add_subtree(ti, ett_bootp);
proto_tree_add_uint_format(bp_tree, hf_bootp_type, NullTVB,
offset, 1,
pd[offset],
pd[offset] == 1 ?
"Boot Request" : "Boot Reply");
proto_tree_add_uint_format(bp_tree, hf_bootp_hw_type, NullTVB,
offset + 1, 1,
pd[offset+1],
"Hardware type: %s",
arphrdtype_to_str(pd[offset+1],
"Unknown (0x%02x)"));
proto_tree_add_uint(bp_tree, hf_bootp_hw_len, NullTVB,
offset + 2, 1, pd[offset+2]);
proto_tree_add_uint(bp_tree, hf_bootp_hops, NullTVB,
offset + 3, 1, pd[offset+3]);
proto_tree_add_uint(bp_tree, hf_bootp_id, NullTVB,
offset + 4, 4, pntohl(&pd[offset+4]));
proto_tree_add_uint(bp_tree, hf_bootp_secs, NullTVB,
offset + 8, 2, pntohs(&pd[offset+8]));
proto_tree_add_uint(bp_tree, hf_bootp_flag, NullTVB,
offset + 10, 2, pntohs(&pd[offset+10]) & 0x8000);
memcpy(&ip_addr, &pd[offset+12], sizeof(ip_addr));
proto_tree_add_ipv4(bp_tree, hf_bootp_ip_client, NullTVB,
offset + 12, 4, ip_addr);
memcpy(&ip_addr, &pd[offset+16], sizeof(ip_addr));
proto_tree_add_ipv4(bp_tree, hf_bootp_ip_your, NullTVB,
offset + 16, 4, ip_addr);
memcpy(&ip_addr, &pd[offset+20], sizeof(ip_addr));
proto_tree_add_ipv4(bp_tree, hf_bootp_ip_server, NullTVB,
offset + 20, 4, ip_addr);
memcpy(&ip_addr, &pd[offset+24], sizeof(ip_addr));
proto_tree_add_ipv4(bp_tree, hf_bootp_ip_relay, NullTVB,
offset + 24, 4, ip_addr);
if (pd[offset+2] > 0) {
proto_tree_add_bytes_format(bp_tree, hf_bootp_hw_addr, NullTVB,
offset + 28, pd[offset+2],
&pd[offset+28],
"Client hardware address: %s",
arphrdaddr_to_str((guint8*)&pd[offset+28],
pd[offset+2], pd[offset+1]));
}
else {
proto_tree_add_text(bp_tree, NullTVB,
offset + 28, 0, "Client address not given");
}
/* The server host name is optional */
if (pd[offset+44]) {
proto_tree_add_string_format(bp_tree, hf_bootp_server, NullTVB,
offset + 44, 64,
&pd[offset+44],
"Server host name: %s",
&pd[offset+44]);
}
else {
proto_tree_add_string_format(bp_tree, hf_bootp_server, NullTVB,
offset + 44, 64,
&pd[offset+44],
"Server host name not given");
}
/* Boot file */
if (pd[offset+108]) {
proto_tree_add_string_format(bp_tree, hf_bootp_file, NullTVB,
offset + 108, 128,
&pd[offset+108],
"Boot file name: %s",
&pd[offset+108]);
}
else {
proto_tree_add_string_format(bp_tree, hf_bootp_file, NullTVB,
offset + 108, 128,
&pd[offset+108],
"Boot file name not given");
}
memcpy(&ip_addr, &pd[offset + 236], sizeof(ip_addr));
if (pntohl(&pd[offset+236]) == 0x63825363) {
proto_tree_add_ipv4_format(bp_tree, hf_bootp_cookie, NullTVB,
offset + 236, 4, ip_addr,
"Magic cookie: (OK)");
}
else {
proto_tree_add_ipv4(bp_tree, hf_bootp_cookie, NullTVB,
offset + 236, 4, ip_addr);
}
}
voff = offset+240;
eoff = pi.captured_len;
while (voff < eoff) {
/* Handle the DHCP option specially here, so that we
can flag DHCP packets as such. */
if (pd[voff] == 53)
dhcp_type = get_dhcp_type(pd[voff+2]);
voff += bootp_option(pd, bp_tree, voff, eoff);
}
if (dhcp_type != NULL ) {
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "DHCP");
if (check_col(fd, COL_INFO))
col_add_fstr(fd, COL_INFO, "DHCP %-8s - Transaction ID 0x%x",
dhcp_type, pntohl(&pd[offset+4]));
if (tree)
proto_tree_add_boolean_hidden(bp_tree, hf_bootp_dhcp,
NullTVB, 0, 0, 1);
}
}
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_NONE, NULL, 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");
proto_register_field_array(proto_bootp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_bootp(void)
{
old_dissector_add("udp.port", UDP_PORT_BOOTPS, dissect_bootp);
}
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