source: MondoRescue/branches/2.2.9/mindi-busybox/coreutils/md5_sha1_sum.c@ 3320

/* 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.
 */

#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_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_ {
        sha512_ctx_t sha512;
        sha256_ctx_t sha256;
        sha1_ctx_t sha1;
        md5_ctx_t md5;
    } context;
    uint8_t *hash_value = NULL;
    RESERVE_CONFIG_UBUFFER(in_buf, 4096);
    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 algorithims */
    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 {
        xfunc_die(); /* can't reach this */
    }

    while ((count = safe_read(src_fd, in_buf, 4096)) > 0) {
        update(&context, in_buf, count);
    }

    if (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');
        }
    }

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

        if (argv[1]) {
            bb_error_msg_and_die("only one argument may be specified with -c");
        }

        pre_computed_stream = xfopen_stdin(argv[0]);

        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);
        }
        /*
        if (fclose_if_not_stdin(pre_computed_stream) == EOF) {
            bb_perror_msg_and_die("can't close file %s", file_ptr);
        }
        */
    } else {
        do {
            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;
}