epan/dissectors/packet-nt-tpcp.c

   1 /* packet-tpcp.c
   2 * Routines for Transparent Proxy Cache Protocol packet disassembly
   3 * (c) Copyright Giles Scott <giles.scott1 [AT] btinternet.com>
   4 *
   5 * $Id$
   6 *
   7 * Wireshark - Network traffic analyzer
   8 * By Gerald Combs <gerald@wireshark.org>
   9 * Copyright 1998 Gerald Combs
  10 *
  11 * This program is free software; you can redistribute it and/or
  12 * modify it under the terms of the GNU General Public License
  13 * as published by the Free Software Foundation; either version 2
  14 * of the License, or (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24 */
  25
  26 #include "config.h"
  27
  28 #include <string.h>
  29
  30 #include <glib.h>
  31
  32 #include <epan/packet.h>
  33 #include <epan/addr_resolv.h> /* this is for get_hostname and get_udp_port */
  34
  35 #define UDP_PORT_TPCP   3121
  36
  37 /* TPCP version1/2 PDU format */
  38 typedef struct _tpcppdu_t {
  39         guint8  version;     /* PDU version 1 */
  40         guint8  type;        /* PDU type: 1=request, 2=reply, 3=add filter, 4=rem  filter */
  41                              /* Version 2 adds 5=add session 6= remove session */
  42         guint16 flags;       /* 0x0001: 0=UDP, 1=TCP*/
  43                              /* 0x0002: 0=NONE, 1=DONT REDIRECT */
  44                              /* 0x0004: 0=NONE, 1=Xon */
  45                              /* 0x0008: 0=NONE, 1=Xoff */
  46         guint16 id;          /* request/response identification or TTL */
  47         guint16 cport;       /* client UDP or TCP port number */
  48         guint32 caddr;       /* client IPv4 address */
  49         guint32 saddr;       /* server IPV4 address */
  50         /* tpcp version 2 only*/
  51         guint32 vaddr;       /* Virtual Server IPv4 address */
  52         guint32 rasaddr;     /* RAS server IPv4 address */
  53         guint32 signature;   /* 0x74706370 - tpcp */
  54 } tpcpdu_t;
  55
  56
  57 static const value_string type_vals[] = {
  58         { 1, "Request" },
  59         { 2, "Reply" },
  60         { 3, "Add Filter" },
  61         { 4, "Remove Filter" },
  62         /* 5 and 6 are for version 2 only */
  63         { 5, "Add Session" },
  64         { 6, "Remove Session" },
  65         { 0,  NULL }
  66 };
  67
  68 /* TPCP Flags */
  69 #define TF_TPCP_UDPTCP 0x0001
  70 #define TF_TPCP_DONTREDIRECT 0x0002
  71 #define TF_TPCP_XON 0x0004
  72 #define TF_TPCP_XOFF 0x0008
  73
  74
  75 /* Version info */
  76 #define TPCP_VER_1 1
  77 #define TPCP_VER_2 2
  78
  79 #define TPCP_VER_1_LENGTH 16
  80 #define TPCP_VER_2_LENGTH 28
  81
  82 /* things we can do filters on */
  83 static int hf_tpcp_version = -1;
  84 static int hf_tpcp_type = -1;
  85 static int hf_tpcp_flags_tcp = -1;
  86 static int hf_tpcp_flags_redir = -1;
  87 static int hf_tpcp_flags_xon = -1;
  88 static int hf_tpcp_flags_xoff = -1;
  89 static int hf_tpcp_id = -1;
  90 static int hf_tpcp_cport = -1;
  91 static int hf_tpcp_caddr = -1;
  92 static int hf_tpcp_saddr = -1;
  93 static int hf_tpcp_vaddr = -1;
  94 static int hf_tpcp_rasaddr = -1;
  95
  96 static int proto_tpcp = -1;
  97
  98 static gint ett_tpcp = -1;
  99 static gint ett_tpcp_flags = -1;
 100
 101
 102 static void
 103 dissect_tpcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 104 {
 105         tpcpdu_t    tpcph;
 106         proto_tree *tpcp_tree = NULL, *field_tree = NULL;
 107         proto_item *ti, *tf;
 108         guint8      length    = TPCP_VER_1_LENGTH;
 109
 110         col_set_str(pinfo->cinfo, COL_PROTOCOL, "TPCP");
 111         col_clear(pinfo->cinfo, COL_INFO);
 112
 113         /* need to find out which version!! */
 114         tpcph.version = tvb_get_guint8(tvb, 0);
 115         /* as version 1 and 2 are so similar use the same structure, just don't use as much for version 1*/
 116         /* XXX: Doing a memcpy into a struct is *not* kosher */
 117         if (tpcph.version == TPCP_VER_1) {
 118                 length = TPCP_VER_1_LENGTH;
 119                 tvb_memcpy(tvb, (guint8 *) &tpcph, 0, length);
 120         } else if (tpcph.version == TPCP_VER_2){
 121                 length = TPCP_VER_2_LENGTH;
 122                 tvb_memcpy(tvb, (guint8 *) &tpcph, 0, length);
 123         } else {
 124                 memset (&tpcph, 0, sizeof (tpcph));
 125         }
 126
 127
 128         tpcph.id        = g_ntohs(tpcph.id);
 129         tpcph.flags     = g_ntohs(tpcph.flags);
 130         tpcph.cport     = g_ntohs(tpcph.cport);
 131         tpcph.signature = g_ntohl(tpcph.signature);
 132
 133         col_add_fstr(pinfo->cinfo, COL_INFO,"%s id %d CPort %s CIP %s SIP %s",
 134                 val_to_str_const(tpcph.type, type_vals, "Unknown"),
 135                 tpcph.id,
 136                 get_udp_port(tpcph.cport),
 137                 ip_to_str((guint8 *)&tpcph.caddr),
 138                 ip_to_str((guint8 *)&tpcph.saddr));
 139
 140         if (tree) {
 141                 ti = proto_tree_add_protocol_format(tree, proto_tpcp, tvb, 0, length,
 142                         "Alteon WebSystems - Transparent Proxy Cache Protocol");
 143
 144                 tpcp_tree = proto_item_add_subtree(ti, ett_tpcp);
 145
 146                 proto_tree_add_uint(tpcp_tree, hf_tpcp_version, tvb, 0, 1, tpcph.version);
 147                 proto_tree_add_uint(tpcp_tree, hf_tpcp_type, tvb, 1, 1, tpcph.type);
 148
 149                 /* flags next , i'll do that when I can work out how to do it :-(   */
 150                 tf = proto_tree_add_text(tpcp_tree, tvb, 2, 2, "Flags: 0x%04x",tpcph.flags);
 151
 152                 field_tree = proto_item_add_subtree(tf, ett_tpcp_flags);
 153                 proto_tree_add_boolean(field_tree, hf_tpcp_flags_tcp, tvb, 2, 2, tpcph.flags);
 154                 proto_tree_add_boolean(field_tree, hf_tpcp_flags_redir, tvb, 2,2, tpcph.flags);
 155                 proto_tree_add_boolean(field_tree, hf_tpcp_flags_xon, tvb, 2, 2, tpcph.flags);
 156                 proto_tree_add_boolean(field_tree, hf_tpcp_flags_xoff, tvb, 2, 2, tpcph.flags);
 157
 158                 proto_tree_add_uint(tpcp_tree, hf_tpcp_id, tvb, 4, 2, tpcph.id);
 159
 160                 proto_tree_add_uint_format_value(tpcp_tree, hf_tpcp_cport, tvb, 6, 2, tpcph.cport,
 161                         "%s", get_udp_port(tpcph.cport));
 162
 163                 proto_tree_add_ipv4(tpcp_tree, hf_tpcp_caddr, tvb, 8, 4, tpcph.caddr);
 164
 165                 proto_tree_add_ipv4(tpcp_tree, hf_tpcp_saddr, tvb, 12, 4, tpcph.saddr);
 166
 167                 if (tpcph.version == TPCP_VER_2) {
 168                         proto_tree_add_ipv4(tpcp_tree, hf_tpcp_vaddr, tvb, 16, 4, tpcph.vaddr);
 169                         proto_tree_add_ipv4(tpcp_tree, hf_tpcp_rasaddr, tvb, 20, 4, tpcph.rasaddr);
 170                         proto_tree_add_text(tpcp_tree, tvb, 24, 4, "Signature: %u", tpcph.signature);
 171                 }
 172
 173         }
 174 }
 175
 176 void
 177 proto_register_tpcp(void)
 178 {
 179         static hf_register_info hf[] = {
 180                 { &hf_tpcp_version,
 181                 { "Version",            "tpcp.version", FT_UINT8, BASE_DEC, NULL, 0x0,
 182                 "TPCP version", HFILL }},
 183
 184                 { &hf_tpcp_type,
 185                 { "Type",               "tpcp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0,
 186                 "PDU type", HFILL }},
 187
 188                 { &hf_tpcp_flags_tcp,
 189                 { "UDP/TCP",            "tpcp.flags.tcp", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_UDPTCP,
 190                 "Protocol type", HFILL }},
 191
 192                 { &hf_tpcp_flags_redir,
 193                 { "No Redirect",        "tpcp.flags.redir", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_DONTREDIRECT,
 194                 "Don't redirect client", HFILL }},
 195
 196                 { &hf_tpcp_flags_xon,
 197                 { "XON",                "tpcp.flags.xon", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_XON,
 198                 NULL, HFILL }},
 199
 200                 { &hf_tpcp_flags_xoff,
 201                 { "XOFF",               "tpcp.flags.xoff", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_XOFF,
 202                 NULL, HFILL }},
 203
 204                 { &hf_tpcp_id,
 205                 { "Client indent",      "tpcp.cid", FT_UINT16, BASE_DEC, NULL, 0x0,
 206                 NULL, HFILL }},
 207
 208                 { &hf_tpcp_cport,
 209                 { "Client Source Port", "tpcp.cport", FT_UINT16, BASE_DEC, NULL, 0x0,
 210                 NULL, HFILL }},
 211
 212                 { &hf_tpcp_caddr,
 213                 { "Client Source IP address",   "tpcp.caddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 214                 NULL, HFILL }},
 215
 216                 { &hf_tpcp_saddr,
 217                 { "Server IP address",  "tpcp.saddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 218                 NULL, HFILL }},
 219
 220                 { &hf_tpcp_vaddr,
 221                 { "Virtual Server IP address", "tpcp.vaddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 222                 NULL, HFILL }},
 223
 224                 { &hf_tpcp_rasaddr,
 225                 { "RAS server IP address", "tpcp.rasaddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 226                 NULL, HFILL }},
 227
 228         };
 229
 230
 231         static gint *ett[] = {
 232                 &ett_tpcp,
 233                 &ett_tpcp_flags,
 234         };
 235
 236         proto_tpcp = proto_register_protocol("Alteon - Transparent Proxy Cache Protocol",
 237                                              "TPCP", "tpcp");
 238         proto_register_field_array(proto_tpcp, hf, array_length(hf));
 239         proto_register_subtree_array(ett, array_length(ett));
 240 }
 241
 242 void
 243 proto_reg_handoff_tpcp(void)
 244 {
 245         dissector_handle_t tpcp_handle;
 246
 247         tpcp_handle = create_dissector_handle(dissect_tpcp, proto_tpcp);
 248         dissector_add_uint("udp.port", UDP_PORT_TPCP, tpcp_handle);
 249 }