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/* tap-flow.c
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* This module provides udp and tcp follow stream capabilities to tshark.
* It is only used by tshark and not wireshark.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <epan/sequence_analysis.h>
#include <epan/stat_tap_ui.h>
#include <epan/tap.h>
void register_tap_listener_flow(void);
#define STR_FLOW "flow,"
#define STR_STANDARD ",standard"
#define STR_NETWORK ",network"
WS_NORETURN static void flow_exit(const char *strp)
{
fprintf(stderr, "tshark: flow - %s\n", strp);
exit(1);
}
static void
flow_draw(void *arg)
{
seq_analysis_info_t* flow_info = (seq_analysis_info_t*)arg;
sequence_analysis_get_nodes(flow_info);
sequence_analysis_dump_to_file(stdout, flow_info, 0);
//clean up the data
sequence_analysis_list_free(flow_info);
sequence_analysis_info_free(flow_info);
}
static bool flow_arg_strncmp(const char **opt_argp, const char *strp)
{
size_t len = strlen(strp);
if (strncmp(*opt_argp, strp, len) == 0)
{
*opt_argp += len;
return true;
}
return false;
}
static void
flow_arg_mode(const char **opt_argp, seq_analysis_info_t *flow_info)
{
if (flow_arg_strncmp(opt_argp, STR_STANDARD))
{
flow_info->any_addr = 1;
}
else if (flow_arg_strncmp(opt_argp, STR_NETWORK))
{
flow_info->any_addr = 0;
}
else
{
flow_exit("Invalid address type.");
}
}
static void
flow_init(const char *opt_argp, void *userdata)
{
seq_analysis_info_t *flow_info = g_new0(seq_analysis_info_t, 1);
GString *errp;
register_analysis_t* analysis = (register_analysis_t*)userdata;
const char *filter=NULL;
opt_argp += strlen(STR_FLOW);
opt_argp += strlen(sequence_analysis_get_name(analysis));
flow_arg_mode(&opt_argp, flow_info);
if (*opt_argp == ',') {
filter = opt_argp + 1;
}
sequence_analysis_list_free(flow_info);
errp = register_tap_listener(sequence_analysis_get_tap_listener_name(analysis), flow_info, filter, sequence_analysis_get_tap_flags(analysis),
NULL, sequence_analysis_get_packet_func(analysis), flow_draw, NULL);
if (errp != NULL)
{
sequence_analysis_list_free(flow_info);
sequence_analysis_info_free(flow_info);
g_string_free(errp, TRUE);
flow_exit("Error registering tap listener.");
}
}
static bool
flow_register(const void *key _U_, void *value, void *userdata _U_)
{
register_analysis_t* analysis = (register_analysis_t*)value;
stat_tap_ui flow_ui;
GString *cmd_str = g_string_new(STR_FLOW);
char *cli_string;
g_string_append(cmd_str, sequence_analysis_get_name(analysis));
cli_string = g_string_free(cmd_str, FALSE);
flow_ui.group = REGISTER_STAT_GROUP_GENERIC;
flow_ui.title = NULL; /* construct this from the protocol info? */
flow_ui.cli_string = cli_string;
flow_ui.tap_init_cb = flow_init;
flow_ui.nparams = 0;
flow_ui.params = NULL;
register_stat_tap_ui(&flow_ui, analysis);
g_free(cli_string);
return false;
}
void
register_tap_listener_flow(void)
{
sequence_analysis_table_iterate_tables(flow_register, NULL);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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