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wireshark/capture_stop_conditions.c

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/* capture_stop_conditions.c
* Implementation for 'stop condition handler'.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <config.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include "conditions.h"
#include "capture_stop_conditions.h"
#include "ws_attributes.h"
/* predefined classes function prototypes */
static condition* _cnd_constr_timeout(condition*, va_list);
static void _cnd_destr_timeout(condition*);
static gboolean _cnd_eval_timeout(condition*, va_list);
static void _cnd_reset_timeout(condition*);
static condition* _cnd_constr_capturesize(condition*, va_list);
static void _cnd_destr_capturesize(condition*);
static gboolean _cnd_eval_capturesize(condition*, va_list);
static void _cnd_reset_capturesize(condition*);
static condition* _cnd_constr_interval(condition*, va_list);
static void _cnd_destr_interval(condition*);
static gboolean _cnd_eval_interval(condition*, va_list);
static void _cnd_reset_interval(condition*);
void init_capture_stop_conditions(void){
cnd_register_class(CND_CLASS_TIMEOUT,
_cnd_constr_timeout,
_cnd_destr_timeout,
_cnd_eval_timeout,
_cnd_reset_timeout);
cnd_register_class(CND_CLASS_CAPTURESIZE,
_cnd_constr_capturesize,
_cnd_destr_capturesize,
_cnd_eval_capturesize,
_cnd_reset_capturesize);
cnd_register_class(CND_CLASS_INTERVAL,
_cnd_constr_interval,
_cnd_destr_interval,
_cnd_eval_interval,
_cnd_reset_interval);
} /* END init_capture_stop_conditions() */
void cleanup_capture_stop_conditions(void){
cnd_unregister_class(CND_CLASS_TIMEOUT);
cnd_unregister_class(CND_CLASS_CAPTURESIZE);
cnd_unregister_class(CND_CLASS_INTERVAL);
} /* END cleanup_capture_stop_conditions() */
/*****************************************************************************/
/* Predefined condition 'timeout'. */
/* class id */
const char* CND_CLASS_TIMEOUT = "cnd_class_timeout";
/* structure that contains user supplied data for this condition */
typedef struct _cnd_timeout_dat{
time_t start_time;
gint32 timeout_s;
}cnd_timeout_dat;
/*
* Constructs new condition for timeout check. This function is invoked by
* 'cnd_new()' in order to perform class specific initialization.
*
* parameter: cnd - Pointer to condition passed by 'cnd_new()'.
* ap - Pointer to user supplied arguments list for this
* constructor.
* returns: Pointer to condition - Construction was successful.
* NULL - Construction failed.
*/
static condition* _cnd_constr_timeout(condition* cnd, va_list ap){
cnd_timeout_dat *data = NULL;
/* allocate memory */
if((data = (cnd_timeout_dat*)g_malloc(sizeof(cnd_timeout_dat))) == NULL)
return NULL;
/* initialize user data */
data->start_time = time(NULL);
data->timeout_s = va_arg(ap, gint32);
cnd_set_user_data(cnd, (void*)data);
return cnd;
} /* END _cnd_constr_timeout() */
/*
* Destroys condition for timeout check. This function is invoked by
* 'cnd_delete()' in order to perform class specific clean up.
*
* parameter: cnd - Pointer to condition passed by 'cnd_delete()'.
*/
static void _cnd_destr_timeout(condition* cnd){
/* free memory */
g_free(cnd_get_user_data(cnd));
} /* END _cnd_destr_timeout() */
/*
* Condition handler for timeout condition. This function is invoked by
* 'cnd_eval()' in order to perform class specific condition checks.
*
* parameter: cnd - The inititalized timeout condition.
* ap - Pointer to user supplied arguments list for this
* handler.
* returns: TRUE - Condition is true.
* FALSE - Condition is false.
*/
static gboolean _cnd_eval_timeout(condition* cnd, va_list ap _U_){
cnd_timeout_dat* data = (cnd_timeout_dat*)cnd_get_user_data(cnd);
gint32 elapsed_time;
/* check timeout here */
if(data->timeout_s == 0) return FALSE; /* 0 == infinite */
elapsed_time = (gint32) (time(NULL) - data->start_time);
if(elapsed_time >= data->timeout_s) return TRUE;
return FALSE;
} /* END _cnd_eval_timeout()*/
/*
* Call this function to reset this condition to its initial state, i.e. the
* state it was in right after creation.
*
* parameter: cnd - Pointer to an initialized condition.
*/
static void _cnd_reset_timeout(condition *cnd){
((cnd_timeout_dat*)cnd_get_user_data(cnd))->start_time = time(NULL);
} /* END _cnd_reset_timeout() */
/*****************************************************************************/
/* Predefined condition 'max. capturesize'. */
/* class id */
const char* CND_CLASS_CAPTURESIZE = "cnd_class_capturesize";
/* structure that contains user supplied data for this condition */
typedef struct _cnd_capturesize_dat{
guint64 max_capture_size;
}cnd_capturesize_dat;
/*
* Constructs new condition for capturesize check. This function is invoked by
* 'cnd_new()' in order to perform class specific initialization.
*
* parameter: cnd - Pointer to condition passed by 'cnd_new()'.
* ap - Pointer to user supplied arguments list for this
* constructor.
* returns: Pointer to condition - Construction was successful.
* NULL - Construction failed.
*/
static condition* _cnd_constr_capturesize(condition* cnd, va_list ap){
cnd_capturesize_dat *data = NULL;
/* allocate memory */
if((data = (cnd_capturesize_dat*)g_malloc(sizeof(cnd_capturesize_dat))) == NULL)
return NULL;
/* initialize user data */
data->max_capture_size = va_arg(ap, guint64);
if (data->max_capture_size > ((guint64)INT_MAX + 1))
data->max_capture_size = (guint64)INT_MAX + 1;
cnd_set_user_data(cnd, (void*)data);
return cnd;
} /* END _cnd_constr_capturesize() */
/*
* Destroys condition for capturesize check. This function is invoked by
* 'cnd_delete()' in order to perform class specific clean up.
*
* parameter: cnd - Pointer to condition passed by 'cnd_delete()'.
*/
static void _cnd_destr_capturesize(condition* cnd){
/* free memory */
g_free(cnd_get_user_data(cnd));
} /* END _cnd_destr_capturesize() */
/*
* Condition handler for capturesize condition. This function is invoked by
* 'cnd_eval()' in order to perform class specific condition checks.
*
* parameter: cnd - The inititalized capturesize condition.
* ap - Pointer to user supplied arguments list for this
* handler.
* returns: TRUE - Condition is true.
* FALSE - Condition is false.
*/
static gboolean _cnd_eval_capturesize(condition* cnd, va_list ap){
cnd_capturesize_dat* data = (cnd_capturesize_dat*)cnd_get_user_data(cnd);
/* check capturesize here */
if(data->max_capture_size == 0) return FALSE; /* 0 == infinite */
if(va_arg(ap, guint64) >= data->max_capture_size){
return TRUE;
}
return FALSE;
} /* END _cnd_eval_capturesize() */
/*
* Call this function to reset this condition to its initial state, i.e. the
* state it was in right after creation.
*
* parameter: cnd - Pointer to an initialized condition.
*/
static void _cnd_reset_capturesize(condition *cnd _U_){
} /* END _cnd_reset_capturesize() */
/*****************************************************************************/
/* Predefined condition 'interval'. */
/* class id */
const char* CND_CLASS_INTERVAL = "cnd_class_interval";
/* structure that contains user supplied data for this condition */
typedef struct _cnd_interval_dat{
time_t start_time;
gint32 interval_s;
}cnd_interval_dat;
/*
* Constructs new condition for interval check. This function is invoked by
* 'cnd_new()' in order to perform class specific initialization.
*
* parameter: cnd - Pointer to condition passed by 'cnd_new()'.
* ap - Pointer to user supplied arguments list for this
* constructor.
* returns: Pointer to condition - Construction was successful.
* NULL - Construction failed.
*/
static condition* _cnd_constr_interval(condition* cnd, va_list ap){
cnd_interval_dat *data = NULL;
/* allocate memory */
if((data = (cnd_interval_dat*)g_malloc(sizeof(cnd_interval_dat))) == NULL)
return NULL;
/* initialize user data */
data->start_time = time(NULL);
data->interval_s = va_arg(ap, gint32);
data->start_time -= data->start_time % data->interval_s;
cnd_set_user_data(cnd, (void*)data);
return cnd;
} /* END _cnd_constr_interval() */
/*
* Destroys condition for interval check. This function is invoked by
* 'cnd_delete()' in order to perform class specific clean up.
*
* parameter: cnd - Pointer to condition passed by 'cnd_delete()'.
*/
static void _cnd_destr_interval(condition* cnd){
/* free memory */
g_free(cnd_get_user_data(cnd));
} /* END _cnd_destr_interval() */
/*
* Condition handler for interval condition. This function is invoked by
* 'cnd_eval()' in order to perform class specific condition checks.
*
* parameter: cnd - The inititalized interval condition.
* ap - Pointer to user supplied arguments list for this
* handler.
* returns: TRUE - Condition is true.
* FALSE - Condition is false.
*/
static gboolean _cnd_eval_interval(condition* cnd, va_list ap _U_){
cnd_interval_dat* data = (cnd_interval_dat*)cnd_get_user_data(cnd);
gint32 elapsed_time;
/* check interval here */
if(data->interval_s == 0) return FALSE; /* 0 == infinite */
elapsed_time = (gint32) (time(NULL) - data->start_time);
if(elapsed_time >= data->interval_s) return TRUE;
return FALSE;
} /* END _cnd_eval_interval()*/
/*
* Call this function to reset this condition to its initial state, i.e. the
* state it was in right after creation.
*
* parameter: cnd - Pointer to an initialized condition.
*/
static void _cnd_reset_interval(condition *cnd){
((cnd_interval_dat*)cnd_get_user_data(cnd))->start_time = time(NULL);
((cnd_interval_dat*)cnd_get_user_data(cnd))->start_time -=
((cnd_interval_dat*)cnd_get_user_data(cnd))->start_time % ((cnd_interval_dat*)cnd_get_user_data(cnd))->interval_s;
} /* END _cnd_reset_interval() */
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* 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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