forked from osmocom/wireshark
425 lines
13 KiB
C
425 lines
13 KiB
C
/* packet-fcgi.c
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* Routines for FastCGI dissection
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* Copyright 2010, Tom Hughes <tom@compton.nu>
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include "packet-tcp.h"
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static int proto_fcgi = -1;
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static guint tcp_port = 0;
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static int hf_fcgi_version = -1;
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static int hf_fcgi_type = -1;
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static int hf_fcgi_id = -1;
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static int hf_fcgi_content_length = -1;
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static int hf_fcgi_padding_length = -1;
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static int hf_fcgi_content_data = -1;
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static int hf_fcgi_padding_data = -1;
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static int hf_fcgi_begin_request_role = -1;
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static int hf_fcgi_begin_request_flags = -1;
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static int hf_fcgi_begin_request_keep_conn = -1;
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static int hf_fcgi_end_request_app_status = -1;
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static int hf_fcgi_end_request_protocol_status = -1;
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static int ett_fcgi = -1;
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static int ett_fcgi_begin_request = -1;
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static int ett_fcgi_end_request = -1;
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static int ett_fcgi_params = -1;
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#define FCGI_BEGIN_REQUEST 1
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#define FCGI_ABORT_REQUEST 2
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#define FCGI_END_REQUEST 3
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#define FCGI_PARAMS 4
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#define FCGI_STDIN 5
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#define FCGI_STDOUT 6
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#define FCGI_STDERR 7
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#define FCGI_DATA 8
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#define FCGI_GET_VALUES 9
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#define FCGI_GET_VALUES_RESULT 10
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#define FCGI_UNKNOWN_TYPE 11
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static const value_string record_types[] = {
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{ 1, "FCGI_BEGIN_REQUEST" },
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{ 2, "FCGI_ABORT_REQUEST" },
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{ 3, "FCGI_END_REQUEST" },
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{ 4, "FCGI_PARAMS" },
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{ 5, "FCGI_STDIN" },
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{ 6, "FCGI_STDOUT" },
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{ 7, "FCGI_STDERR" },
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{ 8, "FCGI_DATA" },
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{ 9, "FCGI_GET_VALUES" },
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{ 10, "FCGI_GET_VALUES_RESULT" },
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{ 11, "FCGI_UNKNOWN_TYPE" },
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{ 0, NULL }
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};
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static const value_string application_roles[] = {
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{ 1, "FCGI_RESPONDER" },
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{ 2, "FCGI_AUTHORIZER" },
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{ 3, "FCGI_FILTER" },
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{ 0, NULL }
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};
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#define FCGI_KEEP_CONN 1
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static const value_string protocol_statuses[] = {
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{ 0, "FCGI_REQUEST_COMPLETE" },
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{ 1, "FCGI_CANT_MPX_CONN" },
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{ 2, "FCGI_OVERLOADED" },
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{ 3, "FCGI_UNKNOWN_ROLE" },
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{ 0, NULL }
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};
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void proto_reg_handoff_fcgi(void);
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static void
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dissect_nv_pairs(tvbuff_t *tvb, proto_tree *fcgi_tree, gint offset, guint16 len)
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{
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gint end_offset = offset + len;
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while (offset < end_offset) {
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gint start_offset = offset;
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guint32 namelen;
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guint32 valuelen;
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char *name;
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char *value;
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namelen = tvb_get_guint8(tvb, offset);
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if ((namelen & 0x80) == 0) {
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offset += 1;
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} else {
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namelen = tvb_get_ntohl(tvb, offset) & 0x7FFFFFFF;
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offset += 4;
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}
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valuelen = tvb_get_guint8(tvb, offset);
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if ((valuelen & 0x80) == 0) {
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offset += 1;
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} else {
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valuelen = tvb_get_ntohl(tvb, offset) & 0x7FFFFFFF;
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offset += 4;
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}
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name = tvb_get_ephemeral_string(tvb, offset, namelen);
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offset += namelen;
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if (valuelen > 0) {
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value = tvb_get_ephemeral_string(tvb, offset, valuelen);
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offset += valuelen;
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proto_tree_add_text(fcgi_tree, tvb, start_offset, offset - start_offset, "%s = %s", name, value);
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} else {
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proto_tree_add_text(fcgi_tree, tvb, start_offset, offset - start_offset, "%s", name);
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}
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}
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}
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static int
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dissect_begin_request(tvbuff_t *tvb, proto_tree *fcgi_tree, gint offset, guint16 len)
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{
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proto_item *br;
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proto_tree *br_tree;
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br = proto_tree_add_text(fcgi_tree, tvb, offset, len, "Begin Request:");
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br_tree = proto_item_add_subtree(br, ett_fcgi_begin_request);
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proto_tree_add_item(br_tree, hf_fcgi_begin_request_role, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(br_tree, hf_fcgi_begin_request_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(br_tree, hf_fcgi_begin_request_keep_conn, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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offset += 5;
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return offset;
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}
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static void
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dissect_abort_request(tvbuff_t *tvb, proto_tree *fcgi_tree, gint offset, guint16 len)
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{
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proto_tree_add_text(fcgi_tree, tvb, offset, len, "Abort Request:");
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return;
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}
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static int
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dissect_end_request(tvbuff_t *tvb, proto_tree *fcgi_tree, gint offset, guint16 len)
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{
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proto_item *er;
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proto_tree *er_tree;
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er = proto_tree_add_text(fcgi_tree, tvb, offset, len, "End Request:");
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er_tree = proto_item_add_subtree(er, ett_fcgi_end_request);
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proto_tree_add_item(er_tree, hf_fcgi_end_request_app_status, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(er_tree, hf_fcgi_end_request_protocol_status, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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offset += 3;
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return offset;
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}
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static void
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dissect_params(tvbuff_t *tvb, proto_tree *fcgi_tree, gint offset, guint16 len)
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{
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proto_item *p;
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proto_tree *p_tree;
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p = proto_tree_add_text(fcgi_tree, tvb, offset, len, "Params:");
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p_tree = proto_item_add_subtree(p, ett_fcgi_params);
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dissect_nv_pairs(tvb, p_tree, offset, len);
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return;
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}
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static void
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dissect_get_values(tvbuff_t *tvb, proto_tree *fcgi_tree, gint offset, guint16 len)
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{
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proto_item *gv;
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proto_tree *gv_tree;
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gv = proto_tree_add_text(fcgi_tree, tvb, offset, len, "Get Values:");
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gv_tree = proto_item_add_subtree(gv, ett_fcgi_params);
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dissect_nv_pairs(tvb, gv_tree, offset, len);
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return;
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}
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static void
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dissect_get_values_result(tvbuff_t *tvb, proto_tree *fcgi_tree, gint offset, guint16 len)
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{
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proto_item *gvr;
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proto_tree *gvr_tree;
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gvr = proto_tree_add_text(fcgi_tree, tvb, offset, len, "Get Values:");
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gvr_tree = proto_item_add_subtree(gvr, ett_fcgi_params);
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dissect_nv_pairs(tvb, gvr_tree, offset, len);
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return;
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}
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static void
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dissect_fcgi_record(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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gint offset = 0;
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guint8 type;
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type = tvb_get_guint8(tvb, 1);
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/* When there are multiple FCGI records in a TCP frame the following code */
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/* will append the type for each record to COL_INFO. */
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/* XXX: Unfortunately, something in the tcp_dissect_pdus() code is broken */
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/* such that only the type for the first FCGI record appears in the */
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/* INFO column. (All write attempts to COL_INFO after the first fail */
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/* because pinfo->cinfo->writable is FALSE). */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "FCGI");
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col_clear(pinfo->cinfo, COL_INFO);
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col_append_sep_str(pinfo->cinfo, COL_INFO, NULL,
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val_to_str(type, record_types, "Unknown (%u)"));
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col_set_fence(pinfo->cinfo, COL_INFO);
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if (tree) { /* we are being asked for details */
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proto_item *ti;
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proto_tree *fcgi_tree;
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guint16 clen;
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guint8 plen;
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ti = proto_tree_add_item(tree, proto_fcgi, tvb, 0, -1, ENC_NA);
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proto_item_append_text(ti, " (%s)",
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val_to_str(type, record_types, "Unknown (%u)"));
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fcgi_tree = proto_item_add_subtree(ti, ett_fcgi);
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proto_tree_add_item(fcgi_tree, hf_fcgi_version, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(fcgi_tree, hf_fcgi_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(fcgi_tree, hf_fcgi_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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clen = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(fcgi_tree, hf_fcgi_content_length, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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plen = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(fcgi_tree, hf_fcgi_padding_length, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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offset += 1;
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switch (type)
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{
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case FCGI_BEGIN_REQUEST:
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dissect_begin_request(tvb, fcgi_tree, offset, clen);
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offset += clen;
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break;
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case FCGI_ABORT_REQUEST:
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dissect_abort_request(tvb, fcgi_tree, offset, clen);
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offset += clen;
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break;
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case FCGI_END_REQUEST:
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dissect_end_request(tvb, fcgi_tree, offset, clen);
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offset += clen;
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break;
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case FCGI_PARAMS:
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dissect_params(tvb, fcgi_tree, offset, clen);
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offset += clen;
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break;
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case FCGI_GET_VALUES:
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dissect_get_values(tvb, fcgi_tree, offset, clen);
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offset += clen;
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break;
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case FCGI_GET_VALUES_RESULT:
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dissect_get_values_result(tvb, fcgi_tree, offset, clen);
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offset += clen;
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break;
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default:
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if (clen > 0) {
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proto_tree_add_item(fcgi_tree, hf_fcgi_content_data, tvb, offset, clen, ENC_NA);
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offset += clen;
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}
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break;
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}
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if (plen > 0) {
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proto_tree_add_item(fcgi_tree, hf_fcgi_padding_data, tvb, offset, plen, ENC_NA);
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/*offset += plen;*/
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}
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}
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}
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static guint
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get_fcgi_record_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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{
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return 8 + tvb_get_ntohs(tvb, offset + 4) + tvb_get_guint8(tvb, offset + 6);
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}
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static void
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dissect_fcgi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tcp_dissect_pdus(tvb, pinfo, tree, TRUE, 8, get_fcgi_record_len, dissect_fcgi_record);
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}
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void
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proto_register_fcgi(void)
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{
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static hf_register_info hf[] = {
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{ &hf_fcgi_version,
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{ "Version", "fcgi.version",
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FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } },
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{ &hf_fcgi_type,
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{ "Type", "fcgi.type",
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FT_UINT8, BASE_DEC, VALS(record_types), 0x0, NULL, HFILL } },
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{ &hf_fcgi_id,
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{ "Request ID", "fcgi.id",
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FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
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{ &hf_fcgi_content_length,
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{ "Content Length", "fcgi.content.length",
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FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
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{ &hf_fcgi_padding_length,
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{ "Padding Length", "fcgi.padding.length",
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FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } },
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{ &hf_fcgi_content_data,
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{ "Content Data", "fcgi.content.data",
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FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
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{ &hf_fcgi_padding_data,
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{ "Padding Data", "fcgi.padding.data",
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FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
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{ &hf_fcgi_begin_request_role,
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{ "Role", "fcgi.begin_request.role",
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FT_UINT16, BASE_DEC, VALS(application_roles), 0x0, NULL, HFILL } },
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{ &hf_fcgi_begin_request_flags,
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{ "Flags", "fcgi.begin_request.flags",
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FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL } },
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{ &hf_fcgi_begin_request_keep_conn,
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{ "FCGI_KEEP_CONN", "fcgi.begin_request.keep_conn",
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FT_BOOLEAN, 8, NULL, FCGI_KEEP_CONN, NULL, HFILL } },
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{ &hf_fcgi_end_request_app_status,
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{ "Application Status", "fcgi.end_request.app_status",
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FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
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{ &hf_fcgi_end_request_protocol_status,
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{ "Protocol Status", "fcgi.end_request.protocol_status",
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FT_UINT32, BASE_DEC, VALS(protocol_statuses), 0x0, NULL, HFILL } }
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};
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static gint *ett[] = {
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&ett_fcgi,
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&ett_fcgi_begin_request,
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&ett_fcgi_end_request,
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&ett_fcgi_params
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};
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module_t *fcgi_module;
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proto_fcgi = proto_register_protocol("FastCGI", "FCGI", "fcgi");
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proto_register_field_array(proto_fcgi, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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fcgi_module = prefs_register_protocol(proto_fcgi, proto_reg_handoff_fcgi);
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prefs_register_uint_preference(fcgi_module,
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"tcp.port",
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"TCP port for FCGI",
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"Set the TCP port for FastCGI traffic",
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10,
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&tcp_port);
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register_dissector("fcgi", dissect_fcgi, proto_fcgi);
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}
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void
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proto_reg_handoff_fcgi(void)
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{
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static gboolean initialized = FALSE;
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static dissector_handle_t fcgi_handle;
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static guint saved_tcp_port;
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if (!initialized) {
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fcgi_handle = create_dissector_handle(dissect_fcgi, proto_fcgi);
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dissector_add_handle("tcp.port", fcgi_handle); /* for "decode as" */
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initialized = TRUE;
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} else if (saved_tcp_port != 0) {
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dissector_delete_uint("tcp.port", saved_tcp_port, fcgi_handle);
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}
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if (tcp_port != 0) {
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dissector_add_uint("tcp.port", tcp_port, fcgi_handle);
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}
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saved_tcp_port = tcp_port;
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}
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