![Gerald Combs](/assets/img/avatar_default.png)
Add user data to conversation filters. Use it to provide necessary data in the Falco Bridge dissector.
150 lines
5 KiB
C
150 lines
5 KiB
C
/* conversation_filter.c
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* Routines for dissector-generated conversation filters for use as
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* display and color filters
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <glib.h>
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#include "packet.h"
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#include "conversation_filter.h"
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GList *packet_conv_filter_list = NULL;
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GList *log_conv_filter_list = NULL;
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static GSList *conversation_proto_names = NULL;
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void conversation_filters_init(void)
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{
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// add_conversation_filter_protocol prepends entries to the list. Add
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// lower layers first so that upper-layer conversations take precedence.
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add_conversation_filter_protocol("eth");
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add_conversation_filter_protocol("ipv6");
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add_conversation_filter_protocol("ip");
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add_conversation_filter_protocol("udp");
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add_conversation_filter_protocol("tcp");
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}
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static void do_register_conversation_filter(GList **conv_filter_list, const char *proto_name, const char *display_name,
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is_filter_valid_func is_filter_valid, build_filter_string_func build_filter_string, void *user_data) {
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conversation_filter_t *entry;
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entry = g_new(conversation_filter_t, 1);
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entry->proto_name = proto_name;
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entry->display_name = display_name;
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entry->is_filter_valid = is_filter_valid;
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entry->build_filter_string = build_filter_string;
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entry->user_data = user_data;
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*conv_filter_list = g_list_append(*conv_filter_list, entry);
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}
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void register_conversation_filter(const char *proto_name, const char *display_name,
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is_filter_valid_func is_filter_valid, build_filter_string_func build_filter_string, void *user_data) {
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do_register_conversation_filter(&packet_conv_filter_list,
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proto_name,
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display_name,
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is_filter_valid,
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build_filter_string,
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user_data);
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}
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void register_log_conversation_filter(const char *proto_name, const char *display_name,
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is_filter_valid_func is_filter_valid, build_filter_string_func build_filter_string, void *user_data) {
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do_register_conversation_filter(&log_conv_filter_list,
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proto_name,
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display_name,
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is_filter_valid,
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build_filter_string,
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user_data);
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}
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void add_conversation_filter_protocol(const char *proto_name)
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{
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for (GSList *cur_entry = conversation_proto_names; cur_entry; cur_entry = g_slist_next(cur_entry)) {
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if (strcmp(proto_name, cur_entry->data) == 0) {
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return;
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}
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}
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conversation_proto_names = g_slist_prepend(conversation_proto_names, (void *)proto_name);
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}
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static struct conversation_filter_s* find_conversation_filter(GList *conv_filter_list, const char *name)
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{
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GList *list_entry = conv_filter_list;
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conversation_filter_t* filter;
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while (list_entry != NULL) {
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filter = (conversation_filter_t*)list_entry->data;
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if (!strcmp(filter->proto_name, name))
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return filter;
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list_entry = g_list_next(list_entry);
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}
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return NULL;
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}
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static void conversation_filter_free(gpointer p, gpointer user_data _U_)
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{
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g_free(p);
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}
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void conversation_filters_cleanup(void)
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{
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g_list_foreach(packet_conv_filter_list, conversation_filter_free, NULL);
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g_list_free(packet_conv_filter_list);
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g_list_foreach(log_conv_filter_list, conversation_filter_free, NULL);
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g_list_free(log_conv_filter_list);
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g_slist_free(conversation_proto_names);
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}
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static gchar *conversation_filter_from_pinfo(GList *conv_filter_list, struct _packet_info *pinfo)
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{
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conversation_filter_t *conv_filter;
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gchar *filter;
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for (GSList *cur_entry = conversation_proto_names; cur_entry; cur_entry = g_slist_next(cur_entry)) {
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conv_filter = find_conversation_filter(conv_filter_list, (const char *) cur_entry->data);
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if (conv_filter && conv_filter->is_filter_valid(pinfo, conv_filter->user_data)) {
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if ((filter = conv_filter->build_filter_string(pinfo, conv_filter->user_data)) != NULL)
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return filter;
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}
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}
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return NULL;
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}
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gchar *conversation_filter_from_packet(struct _packet_info *pinfo)
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{
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return conversation_filter_from_pinfo(packet_conv_filter_list, pinfo);
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}
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gchar *conversation_filter_from_log(struct _packet_info *pinfo)
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{
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return conversation_filter_from_pinfo(log_conv_filter_list, pinfo);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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