source: mainline/uspace/app/pcapctl/main.c@ 87b490e3

/*
 * Copyright (c) 2023 Nataliia Korop
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup pcapctl
 * @{
 */
/** @file pcapctl command-line utility.
 */

#include <stdio.h>
#include <str.h>
#include <errno.h>
#include <arg_parse.h>
#include <getopt.h>
#include <vfs/vfs.h>

#include "pcapdump_client.h"

#define NAME                            "pcapctl"
#define DEFAULT_DEV_NUM         0
#define DECIMAL_SYSTEM          10

/* Default writer operations for dumper, must be consistent with array defined in /uspace/lib/pcap/pcap_dumper.c */
#define DEFAULT_FILE_OPS        0
#define SHORT_FILE_OPS          1
#define APPEND_FILE_OPS         2
#define USB_FILE_OPS            3

/** Create async session and send start request.
 *  @param dev_number index of the device that can dump packets.
 *  @param name of the output buffer.
 *  @param ops_index index of the writer operations for the dumper.
 *  @return EOK if all parameters are valid and start request was sent successfully, error code otherwise.
 */
static errno_t start_dumping(int *dev_number, const char *name, int *ops_index)
{
        pcapctl_sess_t *sess = NULL;
        errno_t rc = pcapctl_dump_open(dev_number, &sess);
        if (rc != EOK) {
                return 1;
        }

        rc = pcapctl_is_valid_ops_number(ops_index, sess);
        if (rc != EOK) {
                printf("Wrong number of ops: %d.\n", *ops_index);
                pcapctl_dump_close(sess);
                return rc;
        }

        rc = pcapctl_dump_start(name, ops_index, sess);
        if (rc != EOK) {
                if (rc == EBUSY) {
                        printf("Dumping for device %d is in process, stop to start dumping to file %s.\n", *dev_number, name);
                }
                printf("Starting the dumping was not successful.\n");
        }
        pcapctl_dump_close(sess);
        return EOK;
}

/** Create async session and send stop dumping request.
 *  @param dev_numbe index of the device on which the dumping will be stopped.
 *  @return EOK if request was sent successfully, error code otherwise.
 */
static errno_t stop_dumping(int *dev_number)
{
        pcapctl_sess_t *sess = NULL;
        errno_t rc = pcapctl_dump_open(dev_number, &sess);
        if (rc != EOK) {
                return 1;
        }
        rc = pcapctl_dump_stop(sess);
        if (rc != EOK) {
                printf("Stoping the dumping was not successful.\n");
        }
        pcapctl_dump_close(sess);
        return EOK;
}

/** Print devices that can dump packets. */
static void list_devs(void)
{
        pcapctl_list();
}

/**
 * Array of supported commandline options
 */
static const struct option opts[] = {
        { "append", required_argument, 0, 'A' }, /* file as argument and ops 0 if not exist and 2 if exists */
        { "new", required_argument, 0, 'N' }, /* file name as argument */
        { "truncated", required_argument, 0, 'T' }, // truncated ops
        { "usb", required_argument, 0, 'U' }, //??
        { "device", required_argument, 0, 'd' },
        { "list", no_argument, 0, 'l' },
        { "help", no_argument, 0, 'h' },
        { "outfile", required_argument, 0, 'o' },
        { "start", no_argument, 0, 'r' },
        { "stop", no_argument, 0, 't' },
        { "ops", required_argument, 0, 'p' },
        { "force", no_argument, 0, 'f' },
        { 0, 0, 0, 0 }
};

/** Check if the file exists.
 *  @param path of the file to check.
 *  @return true if exists, false otherwise.
 */
static bool file_exists(const char *path)
{
        vfs_stat_t stats;
        if (vfs_stat_path(path, &stats) != EOK) {
                return false;
        } else {
                return true;
        }
}

static void usage(void)
{
        printf("HelenOS Packet Dumping utility.\n"
            "Usage:\n"
            NAME " --list | -l \n"
            "\tList of devices\n"
            NAME " --start | -r --device= | -d <device number from list> --outfile= | -o <outfile> --ops= | p <ops index>\n"
            "\tPackets dumped from device will be written to <outfile>\n"
            NAME " --stop | -t --device= | -d <device number from list>\n"
            "\tDumping from <device> stops\n"
            NAME " --start | -r --outfile= | -o <outfile>\n"
            "\tPackets dumped from the 0. device from the list will be written to <outfile>\n"
            NAME " --help | -h\n"
            "\tShow this application help.\n"
            NAME " --force | -f"
            "\tTo open existing file and write to it.\n");
}

int main(int argc, char *argv[])
{
        bool start = false;
        bool stop = false;
        int dev_number = DEFAULT_DEV_NUM;
        int ops_number = DEFAULT_FILE_OPS;
        bool forced = false;
        const char *output_file_name = "";
        int idx = 0;
        int ret = 0;
        if (argc == 1) {
                usage();
                return 0;
        }
        while (ret != -1) {
                ret = getopt_long(argc, argv, "A:N:T:U:d:lho:rtp:f", opts, &idx);
                switch (ret) {
                case 'd':
                        char *rest;
                        long dev_result = strtol(optarg, &rest, DECIMAL_SYSTEM);
                        dev_number = (int)dev_result;
                        errno_t rc = pcapctl_is_valid_device(&dev_number);
                        if (rc != EOK) {
                                printf("Device with index %d not found\n", dev_number);
                                return 1;
                        }
                        break;
                case 'A':
                        output_file_name = optarg;
                        if (file_exists(output_file_name)) {
                                ops_number = APPEND_FILE_OPS;
                        }
                        break;
                case 'N':
                        output_file_name = optarg;
                        break;
                case 'T':
                        output_file_name = optarg;
                        ops_number = SHORT_FILE_OPS;
                        break;
                case 'U':
                        output_file_name = optarg;
                        ops_number = USB_FILE_OPS;
                        break;
                case 'l':
                        list_devs();
                        return 0;
                case 'h':
                        usage();
                        return 0;
                case 'o':
                        output_file_name = optarg;
                        break;
                case 'r':
                        start = true;
                        break;
                case 't':
                        stop = true;
                        break;
                case 'p':
                        char *ops_inval;
                        long ops_result = strtol(optarg, &ops_inval, DECIMAL_SYSTEM);
                        ops_number = (int)ops_result;
                        break;
                case 'f':
                        forced = true;
                        break;
                }
        }

        if (!str_cmp(output_file_name, "") && start) {
                printf("Dumping destination was not specified. Specify with --outfile | -o\n");
                return 1;
        }

        if (start) {

                if (file_exists(output_file_name) && !forced && ops_number != 2) {
                        printf("File %s already exists. If you want to overwrite to it, then use flag --force.\n", output_file_name);
                        return 0;
                }

                printf("Sarting dumping on device - %d, ops - %d.\n", dev_number, ops_number);

                /* start with dev number and name */
                start_dumping(&dev_number, output_file_name, &ops_number);
        } else if (stop) {
                /* stop with dev number */
                printf("Stopping dumping on device - %d, ops - %d.\n", dev_number, ops_number);
                stop_dumping(&dev_number);
        } else {
                usage();
                return 1;
        }
        return 0;
}

/** @}
 */