forked from osmocom/wireshark
549 lines
16 KiB
C
549 lines
16 KiB
C
/* packet-dcc.c
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* Routines for Distributed Checksum Clearinghouse packet dissection
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* DCC Home: http://www.rhyolite.com/anti-spam/dcc/
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*
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* Copyright 1999, Nathan Neulinger <nneul@umr.edu>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-tftp.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <packet-dcc.h>
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static int proto_dcc = -1;
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static int hf_dcc_len = -1;
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static int hf_dcc_pkt_vers = -1;
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static int hf_dcc_op = -1;
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static int hf_dcc_clientid = -1;
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static int hf_dcc_opnums_host = -1;
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static int hf_dcc_opnums_pid = -1;
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static int hf_dcc_opnums_report = -1;
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static int hf_dcc_opnums_retrans = -1;
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static int hf_dcc_signature = -1;
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static int hf_dcc_max_pkt_vers = -1;
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static int hf_dcc_qdelay_ms = -1;
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static int hf_dcc_brand = -1;
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static int hf_dcc_ck_type = -1;
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static int hf_dcc_ck_len = -1;
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static int hf_dcc_ck_sum = -1;
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static int hf_dcc_date = -1;
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static int hf_dcc_target = -1;
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static int hf_dcc_adminop = -1;
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static int hf_dcc_adminval = -1;
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static int hf_dcc_floodop = -1;
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static int hf_dcc_trace = -1;
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static int hf_dcc_trace_admin = -1;
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static int hf_dcc_trace_anon = -1;
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static int hf_dcc_trace_client = -1;
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static int hf_dcc_trace_rlim = -1;
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static int hf_dcc_trace_query = -1;
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static int hf_dcc_trace_ridc = -1;
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static int hf_dcc_trace_flood = -1;
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static gint ett_dcc = -1;
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static gint ett_dcc_opnums = -1;
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static gint ett_dcc_op = -1;
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static gint ett_dcc_ck = -1;
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static gint ett_dcc_trace = -1;
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/* Utility macros */
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#define D_SIGNATURE() \
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proto_tree_add_item(dcc_optree, hf_dcc_signature, tvb, \
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offset, (int)sizeof(DCC_SIGNATURE), ENC_NA); \
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offset += (int)sizeof(DCC_SIGNATURE);
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#define D_LABEL(label,len) \
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proto_tree_add_text(dcc_optree, tvb, offset, len, label); \
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offset += len;
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#define D_TEXT(label, endpad) { \
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int next_offset,left; \
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while (tvb_offset_exists(tvb, offset+endpad)) { \
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left = tvb_length_remaining(tvb,offset) - endpad; \
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tvb_find_line_end(tvb, offset, left, &next_offset, \
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FALSE); \
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proto_tree_add_text(dcc_optree, tvb, offset, \
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next_offset - offset, "%s: %s", \
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label, tvb_format_text(tvb, offset, next_offset - offset)); \
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offset = next_offset; \
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} \
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}
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#define D_TARGET() \
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proto_tree_add_item(dcc_tree, hf_dcc_target, tvb, \
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offset, (int)sizeof(DCC_TGTS), ENC_BIG_ENDIAN); \
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offset += (int)sizeof(DCC_TGTS);
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#define D_DATE() { \
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nstime_t ts; \
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ts.nsecs = 0; \
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ts.secs = tvb_get_ntohl(tvb,offset); \
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proto_tree_add_time(dcc_optree, hf_dcc_date, tvb, offset, 4, &ts); \
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offset += 4; \
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}
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#define D_CHECKSUM() { \
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proto_tree *cktree, *ckti; \
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ckti = proto_tree_add_text(dcc_optree, tvb, offset, (int)sizeof(DCC_CK), \
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"Checksum - %s", val_to_str(tvb_get_guint8(tvb,offset), \
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dcc_cktype_vals, \
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"Unknown Type: %u")); \
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cktree = proto_item_add_subtree(ckti, ett_dcc_ck); \
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proto_tree_add_item(cktree, hf_dcc_ck_type, tvb, offset, 1, ENC_BIG_ENDIAN); \
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offset += 1; \
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proto_tree_add_item(cktree, hf_dcc_ck_len, tvb, offset, 1, ENC_BIG_ENDIAN); \
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offset += 1; \
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proto_tree_add_item(cktree, hf_dcc_ck_sum, tvb, offset, \
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(int)sizeof(DCC_SUM), ENC_NA); \
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offset += (int)sizeof(DCC_SUM); \
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}
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/* Lookup string tables */
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static const value_string dcc_op_vals[] = {
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{DCC_OP_INVALID, "Invalid Op"},
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{DCC_OP_NOP, "No-Op"},
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{DCC_OP_REPORT, "Report and Query"},
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{DCC_OP_QUERY, "Query"},
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{DCC_OP_QUERY_RESP, "Server Response"},
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{DCC_OP_ADMN, "Admin"},
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{DCC_OP_OK, "Ok"},
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{DCC_OP_ERROR, "Server Failing"},
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{DCC_OP_DELETE, "Delete Checksum(s)"},
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{0, NULL}
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};
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static const value_string dcc_cktype_vals[] = {
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{DCC_CK_INVALID, "Invalid/Deleted from DB when seen"},
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{DCC_CK_IP, "MD5 of binary source IPv6 address"},
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{DCC_CK_ENV_FROM, "MD5 of envelope Mail From value"},
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{DCC_CK_FROM, "MD5 of header From: line"},
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{DCC_CK_SUB, "MD5 of substitute header line"},
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{DCC_CK_MESSAGE_ID, "MD5 of header Message-ID: line"},
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{DCC_CK_RECEIVED, "MD5 of last header Received: line"},
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{DCC_CK_BODY, "MD5 of body"},
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{DCC_CK_FUZ1, "MD5 of filtered body - FUZ1"},
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{DCC_CK_FUZ2, "MD5 of filtered body - FUZ2"},
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{DCC_CK_FUZ3, "MD5 of filtered body - FUZ3"},
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{DCC_CK_FUZ4, "MD5 of filtered body - FUZ4"},
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{DCC_CK_SRVR_ID, "hostname for server-ID check "},
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{DCC_CK_ENV_TO, "MD5 of envelope Rcpt To value"},
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{0, NULL},
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};
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static const value_string dcc_adminop_vals[] = {
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{DCC_AOP_OK, "Never sent"},
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{DCC_AOP_STOP, "Stop Gracefully"},
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{DCC_AOP_NEW_IDS, "Load keys and client IDs"},
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{DCC_AOP_FLOD, "Flood control"},
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{DCC_AOP_DB_UNLOCK, "Start Switch to new database"},
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{DCC_AOP_DB_NEW, "Finish Switch to new database"},
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{DCC_AOP_STATS, "Return counters"},
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{DCC_AOP_STATS_CLEAR, "Return and zero counters"},
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{DCC_AOP_TRACE_ON, "Enable tracing"},
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{DCC_AOP_TRACE_OFF, "Disable tracing"},
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{DCC_AOP_CUR_CLIENTS, "List clients"},
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{0, NULL},
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};
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static const value_string dcc_target_vals[] = {
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{DCC_TGTS_TOO_MANY, "Targets (>= 16777200)"},
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{DCC_TGTS_OK, "Certified not spam"},
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{DCC_TGTS_OK2, "Half certified not spam"},
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{DCC_TGTS_DEL, "Deleted checksum"},
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{DCC_TGTS_INVALID, "Invalid"},
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{0, NULL},
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};
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static const value_string dcc_floodop_vals[] = {
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{DCC_AOP_FLOD_CHECK, "Check"},
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{DCC_AOP_FLOD_SHUTDOWN, "Shutdown"},
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{DCC_AOP_FLOD_HALT, "Halt"},
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{DCC_AOP_FLOD_RESUME, "Resume"},
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{DCC_AOP_FLOD_REWIND, "Rewind"},
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{DCC_AOP_FLOD_LIST, "List"},
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{DCC_AOP_FLOD_STATS, "Stats"},
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{DCC_AOP_FLOD_STATS_CLEAR, "Clear Stats"},
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{0,NULL},
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};
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static gboolean
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dissect_dcc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_tree *dcc_tree, *dcc_optree, *dcc_opnumtree, *ti;
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proto_tree *dcc_tracetree;
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int offset = 0;
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int client_is_le = 0;
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int op = 0;
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int i, is_response;
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if (pinfo->srcport != DCC_PORT && pinfo->destport != DCC_PORT) {
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/* Not the right port - not a DCC packet. */
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return FALSE;
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}
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/* get at least a full packet structure */
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if ( tvb_length(tvb) < sizeof(DCC_HDR) ) {
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/* Doesn't have enough bytes to contain packet header. */
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return FALSE;
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}
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "DCC");
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offset = 0;
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is_response = pinfo->srcport == DCC_PORT;
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"%s: %s",
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is_response ? "Response" : "Request",
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val_to_str(tvb_get_guint8(tvb, offset+3),
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dcc_op_vals, "Unknown Op: %u")
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);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_dcc, tvb, offset, -1,
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ENC_NA);
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dcc_tree = proto_item_add_subtree(ti, ett_dcc);
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proto_tree_add_item(dcc_tree, hf_dcc_len, tvb,
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offset, 2, ENC_BIG_ENDIAN);
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if ( tvb_length(tvb) < tvb_get_ntohs(tvb, offset)) {
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/* Doesn't have number of bytes that header claims. */
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proto_tree_add_text(dcc_tree, tvb, offset, 2, "Error - packet is shorter than header claims!");
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}
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offset += 2;
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proto_tree_add_item(dcc_tree, hf_dcc_pkt_vers, tvb,
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offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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op = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(dcc_tree, hf_dcc_op, tvb,
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offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(dcc_tree, hf_dcc_clientid, tvb,
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offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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ti = proto_tree_add_text(dcc_tree, tvb, offset, -1, "Operation Numbers (Opaque to Server)");
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dcc_opnumtree = proto_item_add_subtree(ti, ett_dcc_opnums);
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/* Note - these are indeterminate - they are sortof considered opaque to the client */
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/* Make some attempt to figure out if this data is little endian, not guaranteed to be
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correct if connection went through a firewall or similar. */
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/* Very hokey check - if all three of pid/report/retrans look like little-endian
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numbers, host is probably little endian. Probably innacurate on super-heavily-used
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DCC clients though. This should be good enough for now. */
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client_is_le = ( (tvb_get_guint8(tvb, offset+4) | tvb_get_guint8(tvb, offset+4)) &&
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(tvb_get_guint8(tvb, offset+8) | tvb_get_guint8(tvb, offset+9)) &&
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(tvb_get_guint8(tvb, offset+12) | tvb_get_guint8(tvb, offset+13)) );
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proto_tree_add_item(dcc_opnumtree, hf_dcc_opnums_host, tvb,
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offset, 4, client_is_le);
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offset += 4;
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proto_tree_add_item(dcc_opnumtree, hf_dcc_opnums_pid, tvb,
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offset, 4, client_is_le);
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offset += 4;
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proto_tree_add_item(dcc_opnumtree, hf_dcc_opnums_report, tvb,
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offset, 4, client_is_le);
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offset += 4;
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proto_tree_add_item(dcc_opnumtree, hf_dcc_opnums_retrans, tvb,
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offset, 4, client_is_le);
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offset += 4;
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ti = proto_tree_add_text(dcc_tree, tvb, offset, -1, "Operation: %s",
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val_to_str(op, dcc_op_vals, "Unknown Op: %u"));
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dcc_optree = proto_item_add_subtree(ti, ett_dcc_op);
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switch(op) {
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case DCC_OP_NOP:
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D_SIGNATURE();
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break;
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case DCC_OP_REPORT:
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D_TARGET();
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for (i=0; i<=DCC_QUERY_MAX &&
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tvb_bytes_exist(tvb, offset+(int)sizeof(DCC_SIGNATURE),1); i++)
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{
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D_CHECKSUM();
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}
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D_SIGNATURE();
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break;
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case DCC_OP_QUERY_RESP:
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for (i=0; i<=DCC_QUERY_MAX &&
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tvb_bytes_exist(tvb, offset+(int)sizeof(DCC_SIGNATURE),1); i++)
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{
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D_TARGET();
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}
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D_SIGNATURE();
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break;
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case DCC_OP_ADMN:
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if ( is_response )
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{
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int left_local = tvb_length_remaining(tvb, offset) -
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(int)sizeof(DCC_SIGNATURE);
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if ( left_local == sizeof(DCC_ADMN_RESP_CLIENTS) )
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{
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D_LABEL("Addr", 16);
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D_LABEL("Id", (int)sizeof(DCC_CLNT_ID));
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D_LABEL("Last Used", 4);
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D_LABEL("Requests", 4);
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}
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else
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{
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D_TEXT("Response Text", (int)sizeof(DCC_SIGNATURE));
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}
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D_SIGNATURE();
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}
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else
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{
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int aop;
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D_DATE();
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aop = tvb_get_guint8(tvb, offset+4);
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proto_tree_add_item(dcc_optree, hf_dcc_adminop, tvb, offset+4,
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1, ENC_BIG_ENDIAN);
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col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
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val_to_str(tvb_get_guint8(tvb,offset+4),
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dcc_adminop_vals, "Unknown (%u)"));
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if (aop == DCC_AOP_TRACE_ON || aop == DCC_AOP_TRACE_OFF )
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{
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ti = proto_tree_add_item(dcc_optree, hf_dcc_trace, tvb, offset,
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4, ENC_BIG_ENDIAN);
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dcc_tracetree = proto_item_add_subtree(ti, ett_dcc_trace);
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proto_tree_add_item(dcc_tracetree, hf_dcc_trace_admin, tvb, offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(dcc_tracetree, hf_dcc_trace_anon, tvb, offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(dcc_tracetree, hf_dcc_trace_client, tvb, offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(dcc_tracetree, hf_dcc_trace_rlim, tvb, offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(dcc_tracetree, hf_dcc_trace_query, tvb, offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(dcc_tracetree, hf_dcc_trace_ridc, tvb, offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(dcc_tracetree, hf_dcc_trace_flood, tvb, offset, 4, ENC_BIG_ENDIAN);
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}
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else if ( aop == DCC_AOP_FLOD )
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{
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proto_tree_add_item(dcc_optree, hf_dcc_floodop,
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tvb, offset, 4, ENC_BIG_ENDIAN);
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col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
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val_to_str(tvb_get_ntohl(tvb,offset),
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dcc_floodop_vals, "Unknown (%u)"));
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}
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else
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{
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proto_tree_add_item(dcc_optree, hf_dcc_adminval,
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tvb, offset, 4, ENC_BIG_ENDIAN);
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}
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offset += 4;
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offset += 1; /* admin op we did in reverse order */
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D_LABEL("Pad", 3);
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D_SIGNATURE();
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}
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break;
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case DCC_OP_OK:
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proto_tree_add_item(dcc_optree, hf_dcc_max_pkt_vers, tvb,
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offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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D_LABEL("Unused", 1);
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proto_tree_add_item(dcc_optree, hf_dcc_qdelay_ms, tvb,
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offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(dcc_optree, hf_dcc_brand, tvb,
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offset, (int)sizeof(DCC_BRAND), ENC_ASCII|ENC_NA);
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offset += (int)sizeof(DCC_BRAND);
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D_SIGNATURE();
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break;
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default:
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/* do nothing */
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break;
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}
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}
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return TRUE;
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}
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void
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proto_register_dcc(void)
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{
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static hf_register_info hf[] = {
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{ &hf_dcc_len, {
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"Packet Length", "dcc.len", FT_UINT16, BASE_DEC,
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NULL, 0, NULL, HFILL }},
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{ &hf_dcc_pkt_vers, {
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"Packet Version", "dcc.pkt_vers", FT_UINT16, BASE_DEC,
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NULL, 0, NULL, HFILL }},
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{ &hf_dcc_op, {
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"Operation Type", "dcc.op", FT_UINT8, BASE_DEC,
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VALS(dcc_op_vals), 0, NULL, HFILL }},
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|
|
{ &hf_dcc_clientid, {
|
|
"Client ID", "dcc.clientid", FT_UINT32, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_opnums_host, {
|
|
"Host", "dcc.opnums.host", FT_UINT32, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_opnums_pid, {
|
|
"Process ID", "dcc.opnums.pid", FT_UINT32, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_opnums_report, {
|
|
"Report", "dcc.opnums.report", FT_UINT32, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_opnums_retrans, {
|
|
"Retransmission", "dcc.opnums.retrans", FT_UINT32, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_signature, {
|
|
"Signature", "dcc.signature", FT_BYTES, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_max_pkt_vers, {
|
|
"Maximum Packet Version", "dcc.max_pkt_vers", FT_UINT8, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_qdelay_ms, {
|
|
"Client Delay", "dcc.qdelay_ms", FT_UINT16, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_brand, {
|
|
"Server Brand", "dcc.brand", FT_STRING, BASE_NONE,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_ck_type, {
|
|
"Type", "dcc.checksum.type", FT_UINT8, BASE_DEC,
|
|
VALS(dcc_cktype_vals), 0, "Checksum Type", HFILL }},
|
|
|
|
{ &hf_dcc_ck_len, {
|
|
"Length", "dcc.checksum.length", FT_UINT8, BASE_DEC,
|
|
NULL, 0, "Checksum Length", HFILL }},
|
|
|
|
{ &hf_dcc_ck_sum, {
|
|
"Sum", "dcc.checksum.sum", FT_BYTES, BASE_NONE,
|
|
NULL, 0, "Checksum", HFILL }},
|
|
|
|
{ &hf_dcc_target, {
|
|
"Target", "dcc.target", FT_UINT32, BASE_HEX,
|
|
VALS(dcc_target_vals), 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_date, {
|
|
"Date", "dcc.date", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_adminop, {
|
|
"Admin Op", "dcc.adminop", FT_UINT8, BASE_DEC,
|
|
VALS(dcc_adminop_vals), 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_adminval, {
|
|
"Admin Value", "dcc.adminval", FT_UINT32, BASE_DEC,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_trace, {
|
|
"Trace Bits", "dcc.trace", FT_UINT32, BASE_HEX,
|
|
NULL, 0, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_trace_admin, {
|
|
"Admin Requests", "dcc.trace.admin", FT_BOOLEAN, 32,
|
|
NULL, 0x00000001, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_trace_anon, {
|
|
"Anonymous Requests", "dcc.trace.anon", FT_BOOLEAN, 32,
|
|
NULL, 0x00000002, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_trace_client, {
|
|
"Authenticated Client Requests", "dcc.trace.client", FT_BOOLEAN, 32,
|
|
NULL, 0x00000004, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_trace_rlim, {
|
|
"Rate-Limited Requests", "dcc.trace.rlim", FT_BOOLEAN, 32,
|
|
NULL, 0x00000008, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_trace_query, {
|
|
"Queries and Reports", "dcc.trace.query", FT_BOOLEAN, 32,
|
|
NULL, 0x00000010, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_trace_ridc, {
|
|
"RID Cache Messages", "dcc.trace.ridc", FT_BOOLEAN, 32,
|
|
NULL, 0x00000020, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_trace_flood, {
|
|
"Input/Output Flooding", "dcc.trace.flood", FT_BOOLEAN, 32,
|
|
NULL, 0x00000040, NULL, HFILL }},
|
|
|
|
{ &hf_dcc_floodop, {
|
|
"Flood Control Operation", "dcc.floodop", FT_UINT32, BASE_DEC,
|
|
VALS(dcc_floodop_vals), 0, NULL, HFILL }},
|
|
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_dcc,
|
|
&ett_dcc_op,
|
|
&ett_dcc_ck,
|
|
&ett_dcc_opnums,
|
|
&ett_dcc_trace,
|
|
};
|
|
|
|
proto_dcc = proto_register_protocol("Distributed Checksum Clearinghouse protocol",
|
|
"DCC", "dcc");
|
|
|
|
proto_register_field_array(proto_dcc, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_dcc(void)
|
|
{
|
|
heur_dissector_add("udp", dissect_dcc, proto_dcc);
|
|
}
|