/*
 * Ouroboros - Copyright (C) 2016 - 2024
 *
 * Ouroboros ping application
 *
 *    Dimitri Staessens <dimitri@ouroboros.rocks>
 *    Sander Vrijders   <sander@ouroboros.rocks>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define _POSIX_C_SOURCE 199506L
#define __XSI_VISIBLE 500

#include <ouroboros/dev.h>
#include <ouroboros/fccntl.h>
#include <ouroboros/fqueue.h>
#include <ouroboros/qos.h>

#include "time_utils.h"

#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <stdint.h>
#include <stdbool.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/time.h>
#include <arpa/inet.h>
#include <math.h>
#include <errno.h>
#include <float.h>

#define OPING_BUF_SIZE  1500
#define ECHO_REQUEST    0
#define ECHO_REPLY      1
#define OPING_MAX_FLOWS 256

#define USAGE_STRING                                                         \
"Usage: oping [OPTION]...\n"                                                 \
"\n"                                                                         \
"Checks liveness between a client and a server\n"                            \
"and reports the Round Trip Time (RTT)\n"                                    \
"\n"                                                                         \
"  -l, --listen            Run in server mode\n"                             \
"\n"                                                                         \
"  -c, --count             Number of packets\n"                              \
"  -d, --duration          Duration of the test (default 1s)\n"              \
"  -i, --interval          Interval (default 1000ms)\n"                      \
"  -n, --server-name       Name of the oping server\n"                       \
"  -q, --qos               QoS (raw, raw_crypt, best, video, voice, data)\n" \
"  -s, --size              Payload size (B, default 64)\n"                   \
"  -Q, --quiet             Only print final statistics\n"                    \
"  -D, --timeofday         Print time of day before each line\n"             \
"\n"                                                                         \
"      --help              Display this help text and exit\n"                \

struct {
        char *    s_apn;
        int       interval;
        uint32_t  count;
        int       size;
        bool      timestamp;
        qosspec_t qs;

        /* stats */
        uint32_t sent;
        uint32_t rcvd;
        size_t   ooo;
        bool     quiet;

        double rtt_min;
        double rtt_max;
        double rtt_avg;
        double rtt_m2;

        pthread_t reader_pt;
        pthread_t writer_pt;
} client;

struct {
        struct timespec times[OPING_MAX_FLOWS];
        fset_t *        flows;
        fqueue_t *      fq;
        pthread_mutex_t lock;

        bool quiet;

        pthread_t cleaner_pt;
        pthread_t accept_pt;
        pthread_t server_pt;
} server;

struct oping_msg {
        uint32_t type;
        uint32_t id;
        uint64_t tv_sec;
        uint64_t tv_nsec;
} __attribute__((packed));


#include "oping_client.c"
#include "oping_server.c"

static void usage(void)
{
        printf(USAGE_STRING);
}

/* Times are in ms. */
static int time_mul(const char * rem)
{
        if (strcmp(rem, "ms") == 0 || strcmp(rem, "") == 0)
                return 1;
        else if(strcmp(rem, "s") == 0)
                return 1000;
        else if (strcmp(rem, "m") == 0)
                return 60 * 1000;
        else if (strcmp(rem, "h") == 0)
                return 60 * 60 * 1000;
        else if (strcmp(rem, "d") == 0)
                return 60 * 60 * 24 * 1000;

        printf("Unknown time unit: %s.\n", rem);

        exit(EXIT_FAILURE);
}

int main(int     argc,
         char ** argv)
{
        int    ret      = -1;
        char * rem      = NULL;
        bool   serv     = false;
        long   duration = 0;
        char * qos      = NULL;

        argc--;
        argv++;

        client.s_apn     = NULL;
        client.interval  = 1000;
        client.size      = 64;
        client.count     = INT_MAX;
        client.timestamp = false;
        client.qs        = qos_raw;
        client.quiet     = false;
        server.quiet     = false;

        while (argc > 0) {
                if ((strcmp(*argv, "-i") == 0 ||
                     strcmp(*argv, "--interval") == 0) &&
                    argc > 1) {
                        client.interval = strtol(*(++argv), &rem, 10);
                        client.interval *= time_mul(rem);
                        --argc;
                } else if ((strcmp(*argv, "-n") == 0 ||
                            strcmp(*argv, "--server-name") == 0) &&
                           argc > 1) {
                        client.s_apn = *(++argv);
                        --argc;
                } else if ((strcmp(*argv, "-c") == 0 ||
                            strcmp(*argv, "--count") == 0) &&
                           argc > 1) {
                        client.count = strtol(*(++argv), &rem, 10);
                        --argc;
                } else if ((strcmp(*argv, "-d") == 0 ||
                            strcmp(*argv, "--duration") == 0) &&
                           argc > 1) {
                        duration = strtol(*(++argv), &rem, 10);
                        duration *= time_mul(rem);
                        --argc;
                } else if ((strcmp(*argv, "-s") == 0 ||
                            strcmp(*argv, "--size") == 0) &&
                           argc > 1) {
                        client.size = strtol(*(++argv), &rem, 10);
                        --argc;
                } else if ((strcmp(*argv, "-q") == 0 ||
                            strcmp(*argv, "--qos") == 0) &&
                           argc > 1) {
                        qos = *(++argv);
                        --argc;
                } else if (strcmp(*argv, "-l") == 0 ||
                           strcmp(*argv, "--listen") == 0) {
                        serv = true;
                } else if (strcmp(*argv, "-D") == 0 ||
                           strcmp(*argv, "--timeofday") == 0) {
                        client.timestamp = true;
                } else if (strcmp(*argv, "-Q") == 0 ||
                           strcmp(*argv, "--quiet") == 0) {
                        client.quiet = true;
                        server.quiet = true;
                } else {
                        goto fail;
                }
                argc--;
                argv++;
        }

        if (duration > 0) {
                if (client.interval == 0)
                        client.count = duration * 10;
                else
                        client.count = duration / client.interval;
        }

        if (qos != NULL) {
                if (strcmp(qos, "best") == 0)
                        client.qs = qos_best_effort;
                else if (strcmp(qos, "raw") == 0)
                        client.qs = qos_raw;
                else if (strcmp(qos, "video") == 0)
                        client.qs = qos_video;
                else if (strcmp(qos, "voice") == 0)
                        client.qs = qos_voice;
                else if (strcmp(qos, "data") == 0)
                        client.qs = qos_data;
                else if (strcmp(qos, "raw_crypt") == 0)
                        client.qs = qos_raw_crypt;
                else
                        printf("Unknown QoS cube, defaulting to raw.\n");
        }

        if (serv) {
                ret = server_main();
        } else {
                if (client.s_apn == NULL) {
                        printf("No server specified.\n");
                        usage();
                        exit(EXIT_FAILURE);
                }
                if (client.interval > 10000) {
                        printf("Ping interval truncated to 10s.\n");
                        client.interval = 10000;
                }
                if (client.size > OPING_BUF_SIZE) {
                        printf("Packet size truncated to %d bytes.\n",
                               OPING_BUF_SIZE);
                        client.size = OPING_BUF_SIZE;
                }
                if (client.size < 64) {
                        printf("Packet size set to 64 bytes.\n");
                        client.size = 64;
                }

                ret = client_main();
        }

        if (ret < 0)
                exit(EXIT_FAILURE);

        exit(EXIT_SUCCESS);

 fail:
        usage();
        exit(EXIT_FAILURE);
}
