/* capture.h
 * Definitions for packet capture windows
 *
 * $Id: capture.h 14205 2005-04-27 19:43:02Z ulfl $
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

/* This file should only be included if libpcap is present */

#ifndef __CAPTURE_H__
#define __CAPTURE_H__

/** @file
 *  Capture related things.
 */

/** Name we give to the child process when doing a "-S" capture. */
#define	CHILD_NAME	"ethereal-capture"


/* Current state of capture engine. XXX - differentiate states */
typedef enum {
	CAPTURE_STOPPED,		/**< stopped */
    CAPTURE_PREPARING,      /**< preparing, but still no response from capture child */
	CAPTURE_RUNNING		    /**< capture child signalled ok, capture is running now */
} capture_state;


/** Capture options coming from user interface */
typedef struct capture_options_tag {
    /* general */
    void     *cf;           /**< handle to cfile (note: untyped handle) */
    gchar    *cfilter;      /**< Capture filter string */
    gchar    *iface;        /**< the network interface to capture from */

#ifdef _WIN32
    int      buffer_size;   /**< the capture buffer size (MB) */
#endif
    gboolean has_snaplen;   /**< TRUE if maximum capture packet length
                                 is specified */
    int      snaplen;       /**< Maximum captured packet length */
    gboolean promisc_mode;  /**< Capture in promiscuous mode */
    int      linktype;      /**< Data link type to use, or -1 for
                                 "use default" */
    gchar    *save_file;    /**< the capture file name */

    /* GUI related */
    gboolean real_time_mode;    /**< Update list of packets in real time */
    gboolean show_info;         /**< show the info dialog */
    gboolean quit_after_cap;    /** Makes a "capture only mode". Implies -k */
    gboolean restart;           /**< restart after closing is done */

    /* multiple files (and ringbuffer) */
    gboolean multi_files_on;    /**< TRUE if ring buffer in use */

    gboolean has_file_duration;	/**< TRUE if ring duration specified */
    gint32 file_duration;       /* Switch file after n seconds */
    gboolean has_ring_num_files;/**< TRUE if ring num_files specified */
    guint32 ring_num_files;     /**< Number of multiple buffer files */

    /* autostop conditions */
    gboolean has_autostop_files;/**< TRUE if maximum number of capture files
					   are specified */
    gint32 autostop_files;      /**< Maximum number of capture files */

    gboolean has_autostop_packets;	/**< TRUE if maximum packet count is
					   specified */
    int autostop_packets;               /**< Maximum packet count */
    gboolean has_autostop_filesize;     /**< TRUE if maximum capture file size
                                             is specified */
    gint32 autostop_filesize;           /**< Maximum capture file size */
    gboolean has_autostop_duration;     /**< TRUE if maximum capture duration
                                             is specified */
    gint32 autostop_duration;           /**< Maximum capture duration */

    /* internally used (don't touch from outside) */
    int fork_child;	            /**< If not -1, in parent, process ID of child */
#ifdef _WIN32
    int signal_pipe_fd;         /**< the pipe to signal the child */
#endif
    capture_state state;        /**< current state of the capture engine */
} capture_options;


/* initialize the capture_options with some reasonable values */
extern void
capture_opts_init(capture_options *capture_opts, void *cfile);

extern void
capture_opts_add_opt(capture_options *capture_opts, const char *appname, int opt, const char *optarg, gboolean *start_capture);

/** 
 * Start a capture session.
 *
 * @param capture_opts the numerous capture options
 * @return TRUE if the capture starts successfully, FALSE otherwise.
 */
extern gboolean capture_start(capture_options *capture_opts);

/** Stop a capture session (usually from a menu item). */
extern void capture_stop(capture_options *capture_opts);

/** Restart the current captured packets and start again. */
extern void capture_restart(capture_options *capture_opts);

/** Terminate the capture child cleanly when exiting. */
extern void capture_kill_child(capture_options *capture_opts);

/**
 * Capture child told us, we have a new (or the first) capture file.
 */
extern gboolean capture_input_new_file(capture_options *capture_opts, gchar *new_file);

/**
 * Capture child told us, we have new packets to read.
 */
extern void capture_input_new_packets(capture_options *capture_opts, int to_read);

/**
 * Capture child closed it's side ot the pipe, do the required cleanup.
 */
extern void capture_input_closed(capture_options *capture_opts);



/** Do the low-level work of a capture (start the capture child).
 *  Returns TRUE if it succeeds, FALSE otherwise. */
extern int  capture_loop_start(capture_options *capture_opts, gboolean *stats_known, struct pcap_stat *stats);

/** Stop a low-level capture (stops the capture child). */
extern void capture_loop_stop(void);



/** Current Capture info. */
typedef struct {
    /* handles */
    gpointer        callback_data;  /**< capture callback handle */
    gpointer        ui;             /**< user interfaces own handle */

    /* capture info */
    packet_counts   *counts;        /**< protocol specific counters */
    time_t          running_time;   /**< running time since last update */
    gint            new_packets;    /**< packets since last update */
} capture_info;


/** Create the capture info dialog */
extern void capture_info_create(
capture_info    *cinfo,
gchar           *iface);

/** Update the capture info counters in the dialog */
extern void capture_info_update(
capture_info    *cinfo);

/** Destroy the capture info dialog again */
extern void capture_info_destroy(
capture_info    *cinfo);


#endif /* capture.h */
