digest_cmd.c

Go to the documentation of this file.

/*
 * Copyright (C) 2009 Daniel Verkamp <daniel@drv.nu>.
 *
 * 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 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <ipxe/command.h>
#include <ipxe/parseopt.h>
#include <ipxe/image.h>
#include <ipxe/settings.h>
#include <ipxe/crypto.h>
#include <ipxe/md5.h>
#include <ipxe/sha1.h>
#include <usr/imgmgmt.h>
#include <hci/digest_cmd.h>

/** @file
 *
 * Digest commands
 *
 */

/** "digest" options */
struct digest_options {
        /** Setting */
        struct named_setting setting;
};

/** "digest" option list */
static struct option_descriptor digest_opts[] = {
        OPTION_DESC ( "set", 's', required_argument, struct digest_options,
                      setting, parse_autovivified_setting ),
};

/** "digest" command descriptor */
static struct command_descriptor digest_cmd =
        COMMAND_DESC ( struct digest_options, digest_opts, 1, MAX_ARGUMENTS,
                       "<image> [<image>...]" );

/**
 * The "digest" command
 *
 * @v argc              Argument count
 * @v argv              Argument list
 * @v digest            Digest algorithm
 * @ret rc              Return status code
 */
int digest_exec ( int argc, char **argv, struct digest_algorithm *digest ) {
        struct digest_options opts;
        struct image *image;
        uint8_t ctx[digest->ctxsize];
        uint8_t out[digest->digestsize];
        unsigned int j;
        int i;
        int rc;

        /* Parse options */
        if ( ( rc = parse_options ( argc, argv, &digest_cmd, &opts ) ) != 0 )
                return rc;

        /* Use default setting type, if not specified */
        if ( ! opts.setting.setting.type )
                opts.setting.setting.type = &setting_type_hexraw;

        /* Calculate digests for each image */
        for ( i = optind ; i < argc ; i++ ) {

                /* Acquire image */
                if ( ( rc = imgacquire ( argv[i], 0, &image ) ) != 0 )
                        return rc;

                /* Calculate digest */
                digest_init ( digest, ctx );
                digest_update ( digest, ctx, image->data, image->len );
                digest_final ( digest, ctx, out );

                /* Display or store digest as directed */
                if ( opts.setting.settings ) {

                        /* Store digest */
                        if ( ( rc = store_setting ( opts.setting.settings,
                                                    &opts.setting.setting, out,
                                                    sizeof ( out ) ) ) != 0 ) {
                                printf ( "Could not store \"%s\": %s\n",
                                         opts.setting.setting.name,
                                         strerror ( rc ) );
                                return rc;
                        }

                } else {

                        /* Print digest */
                        for ( j = 0 ; j < sizeof ( out ) ; j++ )
                                printf ( "%02x", out[j] );
                        printf ( "  %s\n", image->name );
                }
        }

        return 0;
}

/* Include "md5sum" and "sha1sum" commands unconditionally */

static int md5sum_exec ( int argc, char **argv ) {
        return digest_exec ( argc, argv, &md5_algorithm );
}

static int sha1sum_exec ( int argc, char **argv ) {
        return digest_exec ( argc, argv, &sha1_algorithm );
}

COMMAND ( md5sum, md5sum_exec );
COMMAND ( sha1sum, sha1sum_exec );

/* Drag in commands for any other enabled algorithms */
REQUIRING_SYMBOL ( digest_exec );
REQUIRE_OBJECT ( config_digest_cmd );