/*

    mtr  --  a network diagnostic tool

    Copyright (C) 2016  Matt Kimball

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License version 2 as

    published by the Free Software Foundation.

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef CMDPIPE_H

#define CMDPIPE_H

#include "mtr.h"

#define COMMAND_BUFFER_SIZE 4096

#define PACKET_REPLY_BUFFER_SIZE 4096

/*  We use a pipe to the mtr-packet subprocess to generate probes  */

struct packet_command_pipe_t {

    /*  the process id of mtr-packet  */

    pid_t pid;

    /*  the end of the pipe we read for replies  */

    int read_fd;

    /*  the end of the pipe we write for commands  */

    int write_fd;

    /* storage for incoming replies */

    char reply_buffer[PACKET_REPLY_BUFFER_SIZE];

    /*  the number of bytes currently used in reply_buffer  */

    size_t reply_buffer_used;

};

typedef

void (

    *probe_reply_func_t) (

    struct mtr_ctl * ctl,

    int sequence,

    struct mplslen * mpls,

    ip_t * addr,

    int round_trip_time);

int open_command_pipe(

    struct mtr_ctl *ctl,

    struct packet_command_pipe_t *cmdpipe);

void close_command_pipe(

    struct packet_command_pipe_t *cmdpipe);

void send_probe_command(

    struct mtr_ctl *ctl,

    struct packet_command_pipe_t *cmdpipe,

    ip_t * address,

    ip_t * localaddress,

    int packet_size,

    int sequence,

    int time_to_live);

void handle_command_replies(

    struct mtr_ctl *ctl,

    struct packet_command_pipe_t *cmdpipe,

    probe_reply_func_t reply_func);

#endif