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 #include <epan/tfs.h>
  18 #include <wsutil/array.h>
  19
  20 void proto_register_tpcp(void);
  21 void proto_reg_handoff_tpcp(void);
  22
  23 static dissector_handle_t tpcp_handle;
  24
  25 #define UDP_PORT_TPCP   3121 /* Not IANA registered */
  26
  27 /* TPCP version1/2 PDU format */
  28 typedef struct _tpcppdu_t {
  29         uint8_t version;     /* PDU version 1 */
  30         uint8_t type;        /* PDU type: 1=request, 2=reply, 3=add filter, 4=rem  filter */
  31                              /* Version 2 adds 5=add session 6= remove session */
  32         uint16_t        flags;       /* 0x0001: 0=UDP, 1=TCP*/
  33                              /* 0x0002: 0=NONE, 1=DONT_REDIRECT */
  34                              /* 0x0004: 0=NONE, 1=Xon */
  35                              /* 0x0008: 0=NONE, 1=Xoff */
  36         uint16_t        id;          /* request/response identification or TTL */
  37         uint16_t        cport;       /* client UDP or TCP port number */
  38         uint32_t        caddr;       /* client IPv4 address */
  39         uint32_t        saddr;       /* server IPV4 address */
  40         /* tpcp version 2 only*/
  41         uint32_t vaddr;      /* Virtual Server IPv4 address */
  42         uint32_t rasaddr;     /* RAS server IPv4 address */
  43         uint32_t signature;   /* 0x74706370 - tpcp */
  44 } tpcpdu_t;
  45
  46
  47 static const value_string type_vals[] = {
  48         { 1, "Request" },
  49         { 2, "Reply" },
  50         { 3, "Add Filter" },
  51         { 4, "Remove Filter" },
  52         /* 5 and 6 are for version 2 only */
  53         { 5, "Add Session" },
  54         { 6, "Remove Session" },
  55         { 0,  NULL }
  56 };
  57
  58 /* TPCP Flags */
  59 #define TF_TPCP_UDPTCP       0x01
  60 #define TF_TPCP_DONTREDIRECT 0x02
  61 #define TF_TPCP_XON          0x04
  62 #define TF_TPCP_XOFF         0x08
  63
  64
  65 /* Version info */
  66 #define TPCP_VER_1 1
  67 #define TPCP_VER_2 2
  68
  69 #define TPCP_VER_1_LENGTH 16
  70 #define TPCP_VER_2_LENGTH 28
  71
  72 /* things we can do filters on */
  73 static int hf_tpcp_version;
  74 static int hf_tpcp_type;
  75 static int hf_tpcp_flags;
  76 static int hf_tpcp_flags_tcp;
  77 static int hf_tpcp_flags_redir;
  78 static int hf_tpcp_flags_xon;
  79 static int hf_tpcp_flags_xoff;
  80 static int hf_tpcp_id;
  81 static int hf_tpcp_cport;
  82 static int hf_tpcp_caddr;
  83 static int hf_tpcp_saddr;
  84 static int hf_tpcp_vaddr;
  85 static int hf_tpcp_rasaddr;
  86 static int hf_tpcp_signature;
  87
  88 static int proto_tpcp;
  89
  90 static int ett_tpcp;
  91 static int ett_tpcp_flags;
  92
  93
  94 static int
  95 dissect_tpcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  96 {
  97         proto_tree *tpcp_tree = NULL;
  98         proto_item *ti;
  99         uint8_t version, type;
 100         uint16_t        id, cport;
 101
 102         static int * const tpcp_flags[] = {
 103                 &hf_tpcp_flags_tcp,
 104                 &hf_tpcp_flags_redir,
 105                 &hf_tpcp_flags_xon,
 106                 &hf_tpcp_flags_xoff,
 107                 NULL
 108                 };
 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         version = tvb_get_uint8(tvb, 0);
 115         if ((version != TPCP_VER_1) && (version != TPCP_VER_2)) {
 116                 /* Not us */
 117                 return 0;
 118         }
 119
 120         ti = proto_tree_add_protocol_format(tree, proto_tpcp, tvb, 0, -1,
 121                                             "Alteon WebSystems - Transparent Proxy Cache Protocol");
 122
 123         tpcp_tree = proto_item_add_subtree(ti, ett_tpcp);
 124
 125         proto_tree_add_item(tpcp_tree, hf_tpcp_version, tvb, 0, 1, ENC_BIG_ENDIAN);
 126         type = tvb_get_uint8(tvb, 1);
 127         proto_tree_add_item(tpcp_tree, hf_tpcp_type, tvb, 1, 1, ENC_BIG_ENDIAN);
 128
 129         proto_tree_add_bitmask(tpcp_tree, tvb, 2, hf_tpcp_flags, ett_tpcp_flags, tpcp_flags, ENC_NA);
 130
 131         /* N.B., flags are 8 bits, so byte at offset 3 skipped.. */
 132
 133         id = tvb_get_ntohs(tvb, 4);
 134         proto_tree_add_item(tpcp_tree, hf_tpcp_id, tvb, 4, 2, ENC_BIG_ENDIAN);
 135
 136         cport = tvb_get_ntohs(tvb, 6);
 137         proto_tree_add_uint_format_value(tpcp_tree, hf_tpcp_cport, tvb, 6, 2, cport,
 138                                          "%s", udp_port_to_display(pinfo->pool, cport));
 139
 140         proto_tree_add_item(tpcp_tree, hf_tpcp_caddr, tvb, 8, 4, ENC_BIG_ENDIAN);
 141         proto_tree_add_item(tpcp_tree, hf_tpcp_saddr, tvb, 12, 4, ENC_BIG_ENDIAN);
 142
 143         if (version == TPCP_VER_2) {
 144                 proto_tree_add_item(tpcp_tree, hf_tpcp_vaddr, tvb, 16, 4, ENC_BIG_ENDIAN);
 145                 proto_tree_add_item(tpcp_tree, hf_tpcp_rasaddr, tvb, 20, 4, ENC_BIG_ENDIAN);
 146                 proto_tree_add_item(tpcp_tree, hf_tpcp_signature, tvb, 24, 4, ENC_BIG_ENDIAN);
 147         }
 148
 149         col_add_fstr(pinfo->cinfo, COL_INFO,"%s id %d CPort %s CIP %s SIP %s",
 150                         val_to_str_const(type, type_vals, "Unknown"),
 151                         id,
 152                         udp_port_to_display(pinfo->pool, cport),
 153                         tvb_ip_to_str(pinfo->pool, tvb, 8),
 154                         tvb_ip_to_str(pinfo->pool, tvb, 12));
 155
 156         if (version == TPCP_VER_1)
 157                 return TPCP_VER_1_LENGTH;
 158
 159         return TPCP_VER_2_LENGTH;
 160 }
 161
 162 void
 163 proto_register_tpcp(void)
 164 {
 165         static hf_register_info hf[] = {
 166                 { &hf_tpcp_version,
 167                 { "Version",            "tpcp.version", FT_UINT8, BASE_DEC, NULL, 0x0,
 168                 "TPCP version", HFILL }},
 169
 170                 { &hf_tpcp_type,
 171                 { "Type",               "tpcp.type", FT_UINT8, BASE_DEC, VALS(type_vals), 0x0,
 172                 "PDU type", HFILL }},
 173
 174                 { &hf_tpcp_flags,
 175                 { "Flags",              "tpcp.flags", FT_UINT16, BASE_HEX, NULL, 0x0,
 176                 NULL, HFILL }},
 177
 178                 { &hf_tpcp_flags_tcp,
 179                 { "UDP/TCP",            "tpcp.flags.tcp", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_UDPTCP,
 180                 "Protocol type", HFILL }},
 181
 182                 { &hf_tpcp_flags_redir,
 183                 { "No Redirect",        "tpcp.flags.redir", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_DONTREDIRECT,
 184                 "Don't redirect client", HFILL }},
 185
 186                 { &hf_tpcp_flags_xon,
 187                 { "XON",                "tpcp.flags.xon", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_XON,
 188                 NULL, HFILL }},
 189
 190                 { &hf_tpcp_flags_xoff,
 191                 { "XOFF",               "tpcp.flags.xoff", FT_BOOLEAN, 8, TFS(&tfs_set_notset), TF_TPCP_XOFF,
 192                 NULL, HFILL }},
 193
 194                 { &hf_tpcp_id,
 195                 { "Client indent",      "tpcp.cid", FT_UINT16, BASE_DEC, NULL, 0x0,
 196                 NULL, HFILL }},
 197
 198                 { &hf_tpcp_cport,
 199                 { "Client Source Port", "tpcp.cport", FT_UINT16, BASE_DEC, NULL, 0x0,
 200                 NULL, HFILL }},
 201
 202                 { &hf_tpcp_caddr,
 203                 { "Client Source IP address",   "tpcp.caddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 204                 NULL, HFILL }},
 205
 206                 { &hf_tpcp_saddr,
 207                 { "Server IP address",  "tpcp.saddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 208                 NULL, HFILL }},
 209
 210                 { &hf_tpcp_vaddr,
 211                 { "Virtual Server IP address", "tpcp.vaddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 212                 NULL, HFILL }},
 213
 214                 { &hf_tpcp_rasaddr,
 215                 { "RAS server IP address", "tpcp.rasaddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 216                 NULL, HFILL }},
 217
 218                 { &hf_tpcp_signature,
 219                 { "Signature",  "tpcp.signature", FT_UINT32, BASE_DEC, NULL, 0x0,
 220                 NULL, HFILL }},
 221         };
 222
 223
 224         static int *ett[] = {
 225                 &ett_tpcp,
 226                 &ett_tpcp_flags,
 227         };
 228
 229         proto_tpcp = proto_register_protocol("Alteon - Transparent Proxy Cache Protocol", "TPCP", "tpcp");
 230         proto_register_field_array(proto_tpcp, hf, array_length(hf));
 231         proto_register_subtree_array(ett, array_length(ett));
 232
 233         tpcp_handle = register_dissector("tpcp", dissect_tpcp, proto_tpcp);
 234 }
 235
 236 void
 237 proto_reg_handoff_tpcp(void)
 238 {
 239         dissector_add_uint_with_preference("udp.port", UDP_PORT_TPCP, tpcp_handle);
 240 }
 241
 242 /*
 243  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 244  *
 245  * Local variables:
 246  * c-basic-offset: 8
 247  * tab-width: 8
 248  * indent-tabs-mode: t
 249  * End:
 250  *
 251  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 252  * :indentSize=8:tabSize=8:noTabs=false:
 253  */