epan/dissectors/packet-nt-tpcp.c

   1 /* packet-nt-tpcp.c
   2  * Routines for Transparent Proxy Cache Protocol packet disassembly
   3  * (c) Copyright Giles Scott <giles.scott1 [AT] btinternet.com>
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * SPDX-License-Identifier: GPL-2.0-or-later
  10  */
  11
  12 #include "config.h"
  13
  14
  15 #include <epan/packet.h>
  16 #include <epan/addr_resolv.h> /* this is for get_hostname and udp_port_to_display */
  17
  18 void proto_register_tpcp(void);
  19 void proto_reg_handoff_tpcp(void);
  20
  21 #define UDP_PORT_TPCP   3121 /* Not IANA registered */
  22
  23 /* TPCP version1/2 PDU format */
  24 typedef struct _tpcppdu_t {
  25         guint8  version;     /* PDU version 1 */
  26         guint8  type;        /* PDU type: 1=request, 2=reply, 3=add filter, 4=rem  filter */
  27                              /* Version 2 adds 5=add session 6= remove session */
  28         guint16 flags;       /* 0x0001: 0=UDP, 1=TCP*/
  29                              /* 0x0002: 0=NONE, 1=DONT_REDIRECT */
  30                              /* 0x0004: 0=NONE, 1=Xon */
  31                              /* 0x0008: 0=NONE, 1=Xoff */
  32         guint16 id;          /* request/response identification or TTL */
  33         guint16 cport;       /* client UDP or TCP port number */
  34         guint32 caddr;       /* client IPv4 address */
  35         guint32 saddr;       /* server IPV4 address */
  36         /* tpcp version 2 only*/
  37         guint32 vaddr;       /* Virtual Server IPv4 address */
  38         guint32 rasaddr;     /* RAS server IPv4 address */
  39         guint32 signature;   /* 0x74706370 - tpcp */
  40 } tpcpdu_t;
  41
  42
  43 static const value_string type_vals[] = {
  44         { 1, "Request" },
  45         { 2, "Reply" },
  46         { 3, "Add Filter" },
  47         { 4, "Remove Filter" },
  48         /* 5 and 6 are for version 2 only */
  49         { 5, "Add Session" },
  50         { 6, "Remove Session" },
  51         { 0,  NULL }
  52 };
  53
  54 /* TPCP Flags */
  55 #define TF_TPCP_UDPTCP 0x0001
  56 #define TF_TPCP_DONTREDIRECT 0x0002
  57 #define TF_TPCP_XON 0x0004
  58 #define TF_TPCP_XOFF 0x0008
  59
  60
  61 /* Version info */
  62 #define TPCP_VER_1 1
  63 #define TPCP_VER_2 2
  64
  65 #define TPCP_VER_1_LENGTH 16
  66 #define TPCP_VER_2_LENGTH 28
  67
  68 /* things we can do filters on */
  69 static int hf_tpcp_version = -1;
  70 static int hf_tpcp_type = -1;
  71 static int hf_tpcp_flags = -1;
  72 static int hf_tpcp_flags_tcp = -1;
  73 static int hf_tpcp_flags_redir = -1;
  74 static int hf_tpcp_flags_xon = -1;
  75 static int hf_tpcp_flags_xoff = -1;
  76 static int hf_tpcp_id = -1;
  77 static int hf_tpcp_cport = -1;
  78 static int hf_tpcp_caddr = -1;
  79 static int hf_tpcp_saddr = -1;
  80 static int hf_tpcp_vaddr = -1;
  81 static int hf_tpcp_rasaddr = -1;
  82 static int hf_tpcp_signature = -1;
  83
  84 static int proto_tpcp = -1;
  85
  86 static gint ett_tpcp = -1;
  87 static gint ett_tpcp_flags = -1;
  88
  89
  90 static int
  91 dissect_tpcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  92 {
  93         proto_tree *tpcp_tree = NULL;
  94         proto_item *ti;
  95         guint8  version, type;
  96         guint16 id, cport;
  97
  98         static const int * tpcp_flags[] = {
  99                 &hf_tpcp_flags_tcp,
 100                 &hf_tpcp_flags_redir,
 101                 &hf_tpcp_flags_xon,
 102                 &hf_tpcp_flags_xoff,
 103                 NULL
 104                 };
 105
 106         col_set_str(pinfo->cinfo, COL_PROTOCOL, "TPCP");
 107         col_clear(pinfo->cinfo, COL_INFO);
 108
 109         /* need to find out which version!! */
 110         version = tvb_get_guint8(tvb, 0);
 111         if ((version != TPCP_VER_1) && (version != TPCP_VER_2)) {
 112                 /* Not us */
 113                 return 0;
 114         }
 115
 116         ti = proto_tree_add_protocol_format(tree, proto_tpcp, tvb, 0, -1,
 117                                             "Alteon WebSystems - Transparent Proxy Cache Protocol");
 118
 119         tpcp_tree = proto_item_add_subtree(ti, ett_tpcp);
 120
 121         proto_tree_add_item(tpcp_tree, hf_tpcp_version, tvb, 0, 1, ENC_BIG_ENDIAN);
 122         type = tvb_get_guint8(tvb, 1);
 123         proto_tree_add_item(tpcp_tree, hf_tpcp_type, tvb, 1, 1, ENC_BIG_ENDIAN);
 124
 125         proto_tree_add_bitmask(tpcp_tree, tvb, 2, hf_tpcp_flags, ett_tpcp_flags, tpcp_flags, ENC_NA);
 126
 127         id = tvb_get_ntohs(tvb, 4);
 128         proto_tree_add_item(tpcp_tree, hf_tpcp_id, tvb, 4, 2, ENC_BIG_ENDIAN);
 129
 130         cport = tvb_get_ntohs(tvb, 6);
 131         proto_tree_add_uint_format_value(tpcp_tree, hf_tpcp_cport, tvb, 6, 2, cport,
 132                                          "%s", udp_port_to_display(wmem_packet_scope(), cport));
 133
 134         proto_tree_add_item(tpcp_tree, hf_tpcp_caddr, tvb, 8, 4, ENC_BIG_ENDIAN);
 135         proto_tree_add_item(tpcp_tree, hf_tpcp_saddr, tvb, 12, 4, ENC_BIG_ENDIAN);
 136
 137         if (version == TPCP_VER_2) {
 138                 proto_tree_add_item(tpcp_tree, hf_tpcp_vaddr, tvb, 16, 4, ENC_BIG_ENDIAN);
 139                 proto_tree_add_item(tpcp_tree, hf_tpcp_rasaddr, tvb, 20, 4, ENC_BIG_ENDIAN);
 140                 proto_tree_add_item(tpcp_tree, hf_tpcp_signature, tvb, 24, 4, ENC_BIG_ENDIAN);
 141         }
 142
 143         col_add_fstr(pinfo->cinfo, COL_INFO,"%s id %d CPort %s CIP %s SIP %s",
 144                         val_to_str_const(type, type_vals, "Unknown"),
 145                         id,
 146                         udp_port_to_display(wmem_packet_scope(), cport),
 147                         tvb_ip_to_str(tvb, 8),
 148                         tvb_ip_to_str(tvb, 12));
 149
 150         if (version == TPCP_VER_1)
 151                 return TPCP_VER_1_LENGTH;
 152
 153         return TPCP_VER_2_LENGTH;
 154 }
 155
 156 void
 157 proto_register_tpcp(void)
 158 {
 159         static hf_register_info hf[] = {
 160                 { &hf_tpcp_version,
 161                 { "Version",            "tpcp.version", FT_UINT8, BASE_DEC, NULL, 0x0,
 162                 "TPCP version", HFILL }},
 163
 164                 { &hf_tpcp_type,
 165                 { "Type",               "tpcp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0,
 166                 "PDU type", HFILL }},
 167
 168                 { &hf_tpcp_flags,
 169                 { "Flags",              "tpcp.flags", FT_UINT16, BASE_HEX, NULL, 0x0,
 170                 NULL, HFILL }},
 171
 172                 { &hf_tpcp_flags_tcp,
 173                 { "UDP/TCP",            "tpcp.flags.tcp", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_UDPTCP,
 174                 "Protocol type", HFILL }},
 175
 176                 { &hf_tpcp_flags_redir,
 177                 { "No Redirect",        "tpcp.flags.redir", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_DONTREDIRECT,
 178                 "Don't redirect client", HFILL }},
 179
 180                 { &hf_tpcp_flags_xon,
 181                 { "XON",                "tpcp.flags.xon", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_XON,
 182                 NULL, HFILL }},
 183
 184                 { &hf_tpcp_flags_xoff,
 185                 { "XOFF",               "tpcp.flags.xoff", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_XOFF,
 186                 NULL, HFILL }},
 187
 188                 { &hf_tpcp_id,
 189                 { "Client indent",      "tpcp.cid", FT_UINT16, BASE_DEC, NULL, 0x0,
 190                 NULL, HFILL }},
 191
 192                 { &hf_tpcp_cport,
 193                 { "Client Source Port", "tpcp.cport", FT_UINT16, BASE_DEC, NULL, 0x0,
 194                 NULL, HFILL }},
 195
 196                 { &hf_tpcp_caddr,
 197                 { "Client Source IP address",   "tpcp.caddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 198                 NULL, HFILL }},
 199
 200                 { &hf_tpcp_saddr,
 201                 { "Server IP address",  "tpcp.saddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 202                 NULL, HFILL }},
 203
 204                 { &hf_tpcp_vaddr,
 205                 { "Virtual Server IP address", "tpcp.vaddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 206                 NULL, HFILL }},
 207
 208                 { &hf_tpcp_rasaddr,
 209                 { "RAS server IP address", "tpcp.rasaddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 210                 NULL, HFILL }},
 211
 212                 { &hf_tpcp_signature,
 213                 { "Signature",  "tpcp.signature", FT_UINT32, BASE_DEC, NULL, 0x0,
 214                 NULL, HFILL }},
 215         };
 216
 217
 218         static gint *ett[] = {
 219                 &ett_tpcp,
 220                 &ett_tpcp_flags,
 221         };
 222
 223         proto_tpcp = proto_register_protocol("Alteon - Transparent Proxy Cache Protocol", "TPCP", "tpcp");
 224         proto_register_field_array(proto_tpcp, hf, array_length(hf));
 225         proto_register_subtree_array(ett, array_length(ett));
 226 }
 227
 228 void
 229 proto_reg_handoff_tpcp(void)
 230 {
 231         dissector_handle_t tpcp_handle;
 232
 233         tpcp_handle = create_dissector_handle(dissect_tpcp, proto_tpcp);
 234         dissector_add_uint_with_preference("udp.port", UDP_PORT_TPCP, tpcp_handle);
 235 }
 236
 237 /*
 238  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 239  *
 240  * Local variables:
 241  * c-basic-offset: 8
 242  * tab-width: 8
 243  * indent-tabs-mode: t
 244  * End:
 245  *
 246  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 247  * :indentSize=8:tabSize=8:noTabs=false:
 248  */