forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
It manipulates the epan_dissect_t structure passed into it and then returns that. Callers can (and have been) just using the passed in epan_dissect_t structure anyway. Change-Id: Ia19d360a7347ff473654eeb553756f59a38f95bd Reviewed-on: https://code.wireshark.org/review/21570 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Jaap Keuter <jaap.keuter@xs4all.nl> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Michael Mann <mmann78@netscape.net>
728 lines
16 KiB
C
728 lines
16 KiB
C
/* epan.c
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*
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* Wireshark Protocol Analyzer Library
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*
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* Copyright (c) 2001 by Gerald Combs <gerald@wireshark.org>
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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 <stdarg.h>
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#include <wsutil/wsgcrypt.h>
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#include <wsutil/ws_printf.h> /* ws_g_warning */
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#ifdef HAVE_LIBGNUTLS
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#include <gnutls/gnutls.h>
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#endif /* HAVE_LIBGNUTLS */
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#include <glib.h>
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#include <wsutil/report_message.h>
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#include <epan/exceptions.h>
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#include "epan-int.h"
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#include "epan.h"
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#include "dfilter/dfilter.h"
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#include "epan_dissect.h"
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#include "conversation.h"
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#include "circuit.h"
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#include "except.h"
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#include "packet.h"
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#include "prefs.h"
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#include "column-utils.h"
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#include "tap.h"
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#include "addr_resolv.h"
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#include "oids.h"
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#include "wmem/wmem.h"
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#include "expert.h"
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#include "print.h"
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#include "capture_dissectors.h"
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#include "exported_pdu.h"
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#include "export_object.h"
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#include "stat_tap_ui.h"
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#include "follow.h"
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#include "disabled_protos.h"
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#include "decode_as.h"
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#include "dissector_filters.h"
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#include "conversation_table.h"
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#include "reassemble.h"
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#include "srt_table.h"
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#include "stats_tree.h"
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#include <dtd.h>
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#ifdef HAVE_LUA
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#include <lua.h>
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#include <wslua/wslua.h>
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#endif
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#ifdef HAVE_LIBSMI
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#include <smi.h>
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#endif
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#ifdef HAVE_C_ARES
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#include <ares_version.h>
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#endif
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#ifdef HAVE_NGHTTP2
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#include <nghttp2/nghttp2ver.h>
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#endif
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#ifdef HAVE_LIBXML2
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#include <libxml/xmlversion.h>
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#include <libxml/parser.h>
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#endif
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static wmem_allocator_t *pinfo_pool_cache = NULL;
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const gchar*
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epan_get_version(void) {
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return VERSION;
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}
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#if defined(_WIN32)
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// Libgcrypt prints all log messages to stderr by default. This is noisier
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// than we would like on Windows. In particular slow_gatherer tends to print
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// "NOTE: you should run 'diskperf -y' to enable the disk statistics"
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// which we don't care about.
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static void
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quiet_gcrypt_logger (void *dummy _U_, int level, const char *format, va_list args)
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{
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GLogLevelFlags log_level = G_LOG_LEVEL_WARNING;
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switch (level) {
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case GCRY_LOG_CONT: // Continuation. Ignore for now.
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case GCRY_LOG_DEBUG:
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case GCRY_LOG_INFO:
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default:
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return;
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case GCRY_LOG_WARN:
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case GCRY_LOG_BUG:
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log_level = G_LOG_LEVEL_WARNING;
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break;
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case GCRY_LOG_ERROR:
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log_level = G_LOG_LEVEL_ERROR;
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break;
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case GCRY_LOG_FATAL:
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log_level = G_LOG_LEVEL_CRITICAL;
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break;
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}
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g_logv(NULL, log_level, format, args);
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}
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#endif // _WIN32
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/*
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* Register all the plugin types that are part of libwireshark, namely
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* dissector and tap plugins.
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*
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* Must be called before init_plugins(), which must be called before
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* any registration routines are called.
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*/
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void
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epan_register_plugin_types(void)
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{
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#ifdef HAVE_PLUGINS
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register_dissector_plugin_type();
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register_tap_plugin_type();
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#endif
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}
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gboolean
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epan_init(void (*register_all_protocols_func)(register_cb cb, gpointer client_data),
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void (*register_all_handoffs_func)(register_cb cb, gpointer client_data),
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register_cb cb,
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gpointer client_data)
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{
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volatile gboolean status = TRUE;
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/* initialize memory allocation subsystem */
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wmem_init();
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/* initialize the GUID to name mapping table */
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guids_init();
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/* initialize name resolution (addr_resolv.c) */
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addr_resolv_init();
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except_init();
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/* initialize libgcrypt (beware, it won't be thread-safe) */
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gcry_check_version(NULL);
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#if defined(_WIN32)
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gcry_set_log_handler (quiet_gcrypt_logger, NULL);
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#endif
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gcry_control (GCRYCTL_DISABLE_SECMEM, 0);
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gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
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#ifdef HAVE_LIBGNUTLS
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gnutls_global_init();
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#endif
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#ifdef HAVE_LIBXML2
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xmlInitParser();
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LIBXML_TEST_VERSION;
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#endif
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TRY {
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tap_init();
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prefs_init();
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expert_init();
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packet_init();
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conversation_init();
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capture_dissector_init();
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reassembly_tables_init();
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proto_init(register_all_protocols_func, register_all_handoffs_func,
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cb, client_data);
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packet_cache_proto_handles();
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dfilter_init();
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final_registration_all_protocols();
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print_cache_field_handles();
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expert_packet_init();
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export_pdu_init();
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#ifdef HAVE_LUA
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wslua_init(cb, client_data);
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#endif
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}
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CATCH(DissectorError) {
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/*
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* This is probably a dissector, or something it calls,
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* calling REPORT_DISSECTOR_ERROR() in a registration
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* routine or something else outside the normal dissection
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* code path.
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*/
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const char *exception_message = GET_MESSAGE;
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static const char dissector_error_nomsg[] =
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"Dissector writer didn't bother saying what the error was";
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report_failure("Dissector bug: %s",
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exception_message == NULL ?
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dissector_error_nomsg : exception_message);
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if (getenv("WIRESHARK_ABORT_ON_DISSECTOR_BUG") != NULL)
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abort();
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status = FALSE;
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}
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ENDTRY;
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return status;
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}
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/*
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* Load all settings, from the current profile, that affect libwireshark.
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*/
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e_prefs *
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epan_load_settings(void)
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{
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e_prefs *prefs_p;
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/* load the decode as entries of the current profile */
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load_decode_as_entries();
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prefs_p = read_prefs();
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/*
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* Read the files that enable and disable protocols and heuristic
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* dissectors.
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*/
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read_enabled_and_disabled_lists();
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return prefs_p;
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}
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void
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epan_cleanup(void)
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{
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dfilter_cleanup();
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proto_cleanup();
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prefs_cleanup();
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decode_clear_all();
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conversation_filters_cleanup();
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reassembly_table_cleanup();
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tap_cleanup();
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packet_cleanup();
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expert_cleanup();
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capture_dissector_cleanup();
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export_pdu_cleanup();
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cleanup_enabled_and_disabled_lists();
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stats_tree_cleanup();
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dtd_location(NULL);
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#ifdef HAVE_LUA
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wslua_cleanup();
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#endif
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#ifdef HAVE_LIBGNUTLS
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gnutls_global_deinit();
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#endif
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#ifdef HAVE_LIBXML2
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xmlCleanupParser();
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#endif
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except_deinit();
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addr_resolv_cleanup();
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if (pinfo_pool_cache != NULL) {
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wmem_destroy_allocator(pinfo_pool_cache);
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pinfo_pool_cache = NULL;
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}
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wmem_cleanup();
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}
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epan_t *
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epan_new(void)
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{
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epan_t *session = g_slice_new(epan_t);
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/* XXX, it should take session as param */
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init_dissection();
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return session;
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}
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const char *
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epan_get_user_comment(const epan_t *session, const frame_data *fd)
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{
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if (session->get_user_comment)
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return session->get_user_comment(session->data, fd);
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return NULL;
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}
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const char *
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epan_get_interface_name(const epan_t *session, guint32 interface_id)
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{
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if (session->get_interface_name)
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return session->get_interface_name(session->data, interface_id);
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return NULL;
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}
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const char *
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epan_get_interface_description(const epan_t *session, guint32 interface_id)
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{
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if (session->get_interface_description)
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return session->get_interface_description(session->data, interface_id);
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return NULL;
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}
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const nstime_t *
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epan_get_frame_ts(const epan_t *session, guint32 frame_num)
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{
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const nstime_t *abs_ts = NULL;
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if (session->get_frame_ts)
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abs_ts = session->get_frame_ts(session->data, frame_num);
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if (!abs_ts)
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ws_g_warning("!!! couldn't get frame ts for %u !!!\n", frame_num);
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return abs_ts;
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}
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void
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epan_free(epan_t *session)
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{
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if (session) {
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/* XXX, it should take session as param */
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cleanup_dissection();
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g_slice_free(epan_t, session);
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}
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}
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void
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epan_conversation_init(void)
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{
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conversation_epan_reset();
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}
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void
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epan_circuit_init(void)
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{
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circuit_init();
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}
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void
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epan_circuit_cleanup(void)
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{
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circuit_cleanup();
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}
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/* Overrides proto_tree_visible i epan_dissect_init to make all fields visible.
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* This is > 0 if a Lua script wanted to see all fields all the time.
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* This is ref-counted, so clearing it won't override other taps/scripts wanting it.
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*/
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static gint always_visible_refcount = 0;
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void
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epan_set_always_visible(gboolean force)
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{
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if (force)
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always_visible_refcount++;
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else if (always_visible_refcount > 0)
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always_visible_refcount--;
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}
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void
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epan_dissect_init(epan_dissect_t *edt, epan_t *session, const gboolean create_proto_tree, const gboolean proto_tree_visible)
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{
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g_assert(edt);
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edt->session = session;
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memset(&edt->pi, 0, sizeof(edt->pi));
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if (pinfo_pool_cache != NULL) {
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edt->pi.pool = pinfo_pool_cache;
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pinfo_pool_cache = NULL;
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}
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else {
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edt->pi.pool = wmem_allocator_new(WMEM_ALLOCATOR_BLOCK_FAST);
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}
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if (create_proto_tree) {
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edt->tree = proto_tree_create_root(&edt->pi);
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proto_tree_set_visible(edt->tree, (always_visible_refcount > 0) ? TRUE : proto_tree_visible);
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}
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else {
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edt->tree = NULL;
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}
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edt->tvb = NULL;
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}
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void
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epan_dissect_reset(epan_dissect_t *edt)
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{
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/* We have to preserve the pool pointer across the memzeroing */
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wmem_allocator_t *tmp;
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g_assert(edt);
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g_slist_free(edt->pi.proto_data);
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g_slist_free(edt->pi.dependent_frames);
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/* Free the data sources list. */
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free_data_sources(&edt->pi);
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if (edt->tvb) {
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/* Free all tvb's chained from this tvb */
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tvb_free_chain(edt->tvb);
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edt->tvb = NULL;
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}
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if (edt->tree)
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proto_tree_reset(edt->tree);
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tmp = edt->pi.pool;
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wmem_free_all(tmp);
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memset(&edt->pi, 0, sizeof(edt->pi));
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edt->pi.pool = tmp;
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}
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epan_dissect_t*
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epan_dissect_new(epan_t *session, const gboolean create_proto_tree, const gboolean proto_tree_visible)
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{
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epan_dissect_t *edt;
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edt = g_new0(epan_dissect_t, 1);
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epan_dissect_init(edt, session, create_proto_tree, proto_tree_visible);
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return edt;
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}
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void
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epan_dissect_fake_protocols(epan_dissect_t *edt, const gboolean fake_protocols)
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{
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if (edt)
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proto_tree_set_fake_protocols(edt->tree, fake_protocols);
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}
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void
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epan_dissect_run(epan_dissect_t *edt, int file_type_subtype,
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struct wtap_pkthdr *phdr, tvbuff_t *tvb, frame_data *fd,
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column_info *cinfo)
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{
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#ifdef HAVE_LUA
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wslua_prime_dfilter(edt); /* done before entering wmem scope */
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#endif
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wmem_enter_packet_scope();
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dissect_record(edt, file_type_subtype, phdr, tvb, fd, cinfo);
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/* free all memory allocated */
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wmem_leave_packet_scope();
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}
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void
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epan_dissect_run_with_taps(epan_dissect_t *edt, int file_type_subtype,
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struct wtap_pkthdr *phdr, tvbuff_t *tvb, frame_data *fd,
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column_info *cinfo)
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{
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wmem_enter_packet_scope();
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tap_queue_init(edt);
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dissect_record(edt, file_type_subtype, phdr, tvb, fd, cinfo);
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tap_push_tapped_queue(edt);
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/* free all memory allocated */
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wmem_leave_packet_scope();
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}
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void
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epan_dissect_file_run(epan_dissect_t *edt, struct wtap_pkthdr *phdr,
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tvbuff_t *tvb, frame_data *fd, column_info *cinfo)
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{
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#ifdef HAVE_LUA
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wslua_prime_dfilter(edt); /* done before entering wmem scope */
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#endif
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wmem_enter_packet_scope();
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dissect_file(edt, phdr, tvb, fd, cinfo);
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/* free all memory allocated */
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wmem_leave_packet_scope();
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}
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void
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epan_dissect_file_run_with_taps(epan_dissect_t *edt, struct wtap_pkthdr *phdr,
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tvbuff_t *tvb, frame_data *fd, column_info *cinfo)
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{
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wmem_enter_packet_scope();
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tap_queue_init(edt);
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dissect_file(edt, phdr, tvb, fd, cinfo);
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tap_push_tapped_queue(edt);
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/* free all memory allocated */
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wmem_leave_packet_scope();
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}
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void
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epan_dissect_cleanup(epan_dissect_t* edt)
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{
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g_assert(edt);
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g_slist_free(edt->pi.proto_data);
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g_slist_free(edt->pi.dependent_frames);
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/* Free the data sources list. */
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free_data_sources(&edt->pi);
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if (edt->tvb) {
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/* Free all tvb's chained from this tvb */
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tvb_free_chain(edt->tvb);
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}
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if (edt->tree) {
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proto_tree_free(edt->tree);
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}
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if (pinfo_pool_cache == NULL) {
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wmem_free_all(edt->pi.pool);
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pinfo_pool_cache = edt->pi.pool;
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}
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else {
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wmem_destroy_allocator(edt->pi.pool);
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}
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}
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void
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epan_dissect_free(epan_dissect_t* edt)
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{
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epan_dissect_cleanup(edt);
|
|
g_free(edt);
|
|
}
|
|
|
|
void
|
|
epan_dissect_prime_with_dfilter(epan_dissect_t *edt, const dfilter_t* dfcode)
|
|
{
|
|
dfilter_prime_proto_tree(dfcode, edt->tree);
|
|
}
|
|
|
|
void
|
|
epan_dissect_prime_with_hfid(epan_dissect_t *edt, int hfid)
|
|
{
|
|
proto_tree_prime_with_hfid(edt->tree, hfid);
|
|
}
|
|
|
|
void
|
|
epan_dissect_prime_with_hfid_array(epan_dissect_t *edt, GArray *hfids)
|
|
{
|
|
guint i;
|
|
|
|
for (i = 0; i < hfids->len; i++) {
|
|
proto_tree_prime_with_hfid(edt->tree,
|
|
g_array_index(hfids, int, i));
|
|
}
|
|
}
|
|
|
|
/* ----------------------- */
|
|
const gchar *
|
|
epan_custom_set(epan_dissect_t *edt, GSList *field_ids,
|
|
gint occurrence,
|
|
gchar *result,
|
|
gchar *expr, const int size )
|
|
{
|
|
return proto_custom_set(edt->tree, field_ids, occurrence, result, expr, size);
|
|
}
|
|
|
|
void
|
|
epan_dissect_fill_in_columns(epan_dissect_t *edt, const gboolean fill_col_exprs, const gboolean fill_fd_colums)
|
|
{
|
|
col_custom_set_edt(edt, edt->pi.cinfo);
|
|
col_fill_in(&edt->pi, fill_col_exprs, fill_fd_colums);
|
|
}
|
|
|
|
gboolean
|
|
epan_dissect_packet_contains_field(epan_dissect_t* edt,
|
|
const char *field_name)
|
|
{
|
|
GPtrArray* array;
|
|
int field_id;
|
|
gboolean contains_field;
|
|
|
|
if (!edt || !edt->tree)
|
|
return FALSE;
|
|
field_id = proto_get_id_by_filter_name(field_name);
|
|
if (field_id < 0)
|
|
return FALSE;
|
|
array = proto_find_finfo(edt->tree, field_id);
|
|
contains_field = (array->len > 0) ? TRUE : FALSE;
|
|
g_ptr_array_free(array, TRUE);
|
|
return contains_field;
|
|
}
|
|
|
|
/*
|
|
* Get compile-time information for libraries used by libwireshark.
|
|
*/
|
|
void
|
|
epan_get_compiled_version_info(GString *str)
|
|
{
|
|
/* SNMP */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_LIBSMI
|
|
g_string_append(str, "with SMI " SMI_VERSION_STRING);
|
|
#else /* no SNMP library */
|
|
g_string_append(str, "without SMI");
|
|
#endif /* _SMI_H */
|
|
|
|
/* c-ares */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_C_ARES
|
|
g_string_append(str, "with c-ares " ARES_VERSION_STR);
|
|
#else
|
|
g_string_append(str, "without c-ares");
|
|
#endif /* HAVE_C_ARES */
|
|
|
|
/* LUA */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_LUA
|
|
g_string_append(str, "with ");
|
|
g_string_append(str, LUA_RELEASE);
|
|
#else
|
|
g_string_append(str, "without Lua");
|
|
#endif /* HAVE_LUA */
|
|
|
|
/* GnuTLS */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_LIBGNUTLS
|
|
g_string_append(str, "with GnuTLS " LIBGNUTLS_VERSION);
|
|
#else
|
|
g_string_append(str, "without GnuTLS");
|
|
#endif /* HAVE_LIBGNUTLS */
|
|
|
|
/* Gcrypt */
|
|
g_string_append(str, ", ");
|
|
g_string_append(str, "with Gcrypt " GCRYPT_VERSION);
|
|
|
|
/* Kerberos */
|
|
/* XXX - I don't see how to get the version number, at least for KfW */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_KERBEROS
|
|
#ifdef HAVE_MIT_KERBEROS
|
|
g_string_append(str, "with MIT Kerberos");
|
|
#else
|
|
/* HAVE_HEIMDAL_KERBEROS */
|
|
g_string_append(str, "with Heimdal Kerberos");
|
|
#endif
|
|
#else
|
|
g_string_append(str, "without Kerberos");
|
|
#endif /* HAVE_KERBEROS */
|
|
|
|
/* GeoIP */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_GEOIP
|
|
g_string_append(str, "with GeoIP");
|
|
#else
|
|
g_string_append(str, "without GeoIP");
|
|
#endif /* HAVE_GEOIP */
|
|
|
|
/* nghttp2 */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_NGHTTP2
|
|
g_string_append(str, "with nghttp2 " NGHTTP2_VERSION);
|
|
#else
|
|
g_string_append(str, "without nghttp2");
|
|
#endif /* HAVE_NGHTTP2 */
|
|
|
|
/* LZ4 */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_LZ4
|
|
g_string_append(str, "with LZ4");
|
|
#else
|
|
g_string_append(str, "without LZ4");
|
|
#endif /* HAVE_LZ4 */
|
|
|
|
/* Snappy */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_SNAPPY
|
|
g_string_append(str, "with Snappy");
|
|
#else
|
|
g_string_append(str, "without Snappy");
|
|
#endif /* HAVE_SNAPPY */
|
|
|
|
/* libxml2 */
|
|
g_string_append(str, ", ");
|
|
#ifdef HAVE_LIBXML2
|
|
g_string_append(str, "with libxml2 " LIBXML_DOTTED_VERSION);
|
|
#else
|
|
g_string_append(str, "without libxml2");
|
|
#endif /* HAVE_LIBXML2 */
|
|
|
|
}
|
|
|
|
/*
|
|
* Get runtime information for libraries used by libwireshark.
|
|
*/
|
|
void
|
|
epan_get_runtime_version_info(GString *str)
|
|
{
|
|
/* GnuTLS */
|
|
#ifdef HAVE_LIBGNUTLS
|
|
g_string_append_printf(str, ", with GnuTLS %s", gnutls_check_version(NULL));
|
|
#endif /* HAVE_LIBGNUTLS */
|
|
|
|
/* Gcrypt */
|
|
g_string_append_printf(str, ", with Gcrypt %s", gcry_check_version(NULL));
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|