source: MondoRescue/branches/3.3/mindi-busybox/coreutils/md5_sha1_sum.c@ 3684

/* vi: set sw=4 ts=4: */
/*
 *  Copyright (C) 2003 Glenn L. McGrath
 *  Copyright (C) 2003-2004 Erik Andersen
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

//usage:#define md5sum_trivial_usage
//usage:    IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
//usage:#define md5sum_full_usage "\n\n"
//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " MD5 checksums"
//usage:    IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
//usage:     "\n    -c  Check sums against list in FILEs"
//usage:     "\n    -s  Don't output anything, status code shows success"
//usage:     "\n    -w  Warn about improperly formatted checksum lines"
//usage:    )
//usage:
//usage:#define md5sum_example_usage
//usage:       "$ md5sum < busybox\n"
//usage:       "6fd11e98b98a58f64ff3398d7b324003\n"
//usage:       "$ md5sum busybox\n"
//usage:       "6fd11e98b98a58f64ff3398d7b324003  busybox\n"
//usage:       "$ md5sum -c -\n"
//usage:       "6fd11e98b98a58f64ff3398d7b324003  busybox\n"
//usage:       "busybox: OK\n"
//usage:       "^D\n"
//usage:
//usage:#define sha1sum_trivial_usage
//usage:    IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
//usage:#define sha1sum_full_usage "\n\n"
//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA1 checksums"
//usage:    IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
//usage:     "\n    -c  Check sums against list in FILEs"
//usage:     "\n    -s  Don't output anything, status code shows success"
//usage:     "\n    -w  Warn about improperly formatted checksum lines"
//usage:    )
//usage:
//usage:#define sha256sum_trivial_usage
//usage:    IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
//usage:#define sha256sum_full_usage "\n\n"
//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA256 checksums"
//usage:    IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
//usage:     "\n    -c  Check sums against list in FILEs"
//usage:     "\n    -s  Don't output anything, status code shows success"
//usage:     "\n    -w  Warn about improperly formatted checksum lines"
//usage:    )
//usage:
//usage:#define sha512sum_trivial_usage
//usage:    IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
//usage:#define sha512sum_full_usage "\n\n"
//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA512 checksums"
//usage:    IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
//usage:     "\n    -c  Check sums against list in FILEs"
//usage:     "\n    -s  Don't output anything, status code shows success"
//usage:     "\n    -w  Warn about improperly formatted checksum lines"
//usage:    )
//usage:
//usage:#define sha3sum_trivial_usage
//usage:    IF_FEATURE_MD5_SHA1_SUM_CHECK("[-c[sw]] ")"[FILE]..."
//usage:#define sha3sum_full_usage "\n\n"
//usage:       "Print" IF_FEATURE_MD5_SHA1_SUM_CHECK(" or check") " SHA3-512 checksums"
//usage:    IF_FEATURE_MD5_SHA1_SUM_CHECK( "\n"
//usage:     "\n    -c  Check sums against list in FILEs"
//usage:     "\n    -s  Don't output anything, status code shows success"
//usage:     "\n    -w  Warn about improperly formatted checksum lines"
//usage:    )

#include "libbb.h"

/* This is a NOEXEC applet. Be very careful! */

enum {
    /* 4th letter of applet_name is... */
    HASH_MD5 = 's', /* "md5>s<um" */
    HASH_SHA1 = '1',
    HASH_SHA256 = '2',
    HASH_SHA3 = '3',
    HASH_SHA512 = '5',
};

#define FLAG_SILENT  1
#define FLAG_CHECK   2
#define FLAG_WARN    4

/* This might be useful elsewhere */
static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
                unsigned hash_length)
{
    /* xzalloc zero-terminates */
    char *hex_value = xzalloc((hash_length * 2) + 1);
    bin2hex(hex_value, (char*)hash_value, hash_length);
    return (unsigned char *)hex_value;
}

static uint8_t *hash_file(const char *filename)
{
    int src_fd, hash_len, count;
    union _ctx_ {
        sha3_ctx_t sha3;
        sha512_ctx_t sha512;
        sha256_ctx_t sha256;
        sha1_ctx_t sha1;
        md5_ctx_t md5;
    } context;
    uint8_t *hash_value;
    void FAST_FUNC (*update)(void*, const void*, size_t);
    void FAST_FUNC (*final)(void*, void*);
    char hash_algo;

    src_fd = open_or_warn_stdin(filename);
    if (src_fd < 0) {
        return NULL;
    }

    hash_algo = applet_name[3];

    /* figure specific hash algorithms */
    if (ENABLE_MD5SUM && hash_algo == HASH_MD5) {
        md5_begin(&context.md5);
        update = (void*)md5_hash;
        final = (void*)md5_end;
        hash_len = 16;
    } else if (ENABLE_SHA1SUM && hash_algo == HASH_SHA1) {
        sha1_begin(&context.sha1);
        update = (void*)sha1_hash;
        final = (void*)sha1_end;
        hash_len = 20;
    } else if (ENABLE_SHA256SUM && hash_algo == HASH_SHA256) {
        sha256_begin(&context.sha256);
        update = (void*)sha256_hash;
        final = (void*)sha256_end;
        hash_len = 32;
    } else if (ENABLE_SHA512SUM && hash_algo == HASH_SHA512) {
        sha512_begin(&context.sha512);
        update = (void*)sha512_hash;
        final = (void*)sha512_end;
        hash_len = 64;
    } else if (ENABLE_SHA3SUM && hash_algo == HASH_SHA3) {
        sha3_begin(&context.sha3);
        update = (void*)sha3_hash;
        final = (void*)sha3_end;
        hash_len = 64;
    } else {
        xfunc_die(); /* can't reach this */
    }

    {
        RESERVE_CONFIG_UBUFFER(in_buf, 4096);
        while ((count = safe_read(src_fd, in_buf, 4096)) > 0) {
            update(&context, in_buf, count);
        }
        hash_value = NULL;
        if (count < 0)
            bb_perror_msg("can't read '%s'", filename);
        else /* count == 0 */ {
            final(&context, in_buf);
            hash_value = hash_bin_to_hex(in_buf, hash_len);
        }
        RELEASE_CONFIG_BUFFER(in_buf);
    }

    if (src_fd != STDIN_FILENO) {
        close(src_fd);
    }

    return hash_value;
}

int md5_sha1_sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int md5_sha1_sum_main(int argc UNUSED_PARAM, char **argv)
{
    int return_value = EXIT_SUCCESS;
    unsigned flags;

    if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK) {
        /* -b "binary", -t "text" are ignored (shaNNNsum compat) */
        flags = getopt32(argv, "scwbt");
        argv += optind;
        //argc -= optind;
    } else {
        argv += 1;
        //argc -= 1;
    }
    if (!*argv)
        *--argv = (char*)"-";

    if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && !(flags & FLAG_CHECK)) {
        if (flags & FLAG_SILENT) {
            bb_error_msg_and_die("-%c is meaningful only with -c", 's');
        }
        if (flags & FLAG_WARN) {
            bb_error_msg_and_die("-%c is meaningful only with -c", 'w');
        }
    }

    do {
        if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && (flags & FLAG_CHECK)) {
            FILE *pre_computed_stream;
            char *line;
            int count_total = 0;
            int count_failed = 0;

            pre_computed_stream = xfopen_stdin(*argv);

            while ((line = xmalloc_fgetline(pre_computed_stream)) != NULL) {
                uint8_t *hash_value;
                char *filename_ptr;

                count_total++;
                filename_ptr = strstr(line, "  ");
                /* handle format for binary checksums */
                if (filename_ptr == NULL) {
                    filename_ptr = strstr(line, " *");
                }
                if (filename_ptr == NULL) {
                    if (flags & FLAG_WARN) {
                        bb_error_msg("invalid format");
                    }
                    count_failed++;
                    return_value = EXIT_FAILURE;
                    free(line);
                    continue;
                }
                *filename_ptr = '\0';
                filename_ptr += 2;

                hash_value = hash_file(filename_ptr);

                if (hash_value && (strcmp((char*)hash_value, line) == 0)) {
                    if (!(flags & FLAG_SILENT))
                        printf("%s: OK\n", filename_ptr);
                } else {
                    if (!(flags & FLAG_SILENT))
                        printf("%s: FAILED\n", filename_ptr);
                    count_failed++;
                    return_value = EXIT_FAILURE;
                }
                /* possible free(NULL) */
                free(hash_value);
                free(line);
            }
            if (count_failed && !(flags & FLAG_SILENT)) {
                bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
                        count_failed, count_total);
            }
            fclose_if_not_stdin(pre_computed_stream);
        } else {
            uint8_t *hash_value = hash_file(*argv);
            if (hash_value == NULL) {
                return_value = EXIT_FAILURE;
            } else {
                printf("%s  %s\n", hash_value, *argv);
                free(hash_value);
            }
        }
    } while (*++argv);

    return return_value;
}