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/* 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;
}
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