mirror of
https://github.com/sheumann/hush.git
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202 lines
4.7 KiB
C
202 lines
4.7 KiB
C
/*
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* Copyright (C) 2003 Glenn L. McGrath
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* Copyright (C) 2003-2004 Erik Andersen
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "busybox.h"
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typedef enum { HASH_SHA1, HASH_MD5 } hash_algo_t;
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#define FLAG_SILENT 1
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#define FLAG_CHECK 2
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#define FLAG_WARN 4
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/* This might be useful elsewhere */
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static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
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unsigned char hash_length)
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{
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int x, len, max;
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unsigned char *hex_value;
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max = (hash_length * 2) + 2;
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hex_value = xmalloc(max);
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for (x = len = 0; x < hash_length; x++) {
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len += snprintf((char*)(hex_value + len), max - len, "%02x", hash_value[x]);
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}
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return (hex_value);
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}
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static uint8_t *hash_file(const char *filename, hash_algo_t hash_algo)
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{
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int src_fd, hash_len, count;
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union _ctx_ {
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sha1_ctx_t sha1;
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md5_ctx_t md5;
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} context;
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uint8_t *hash_value = NULL;
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RESERVE_CONFIG_UBUFFER(in_buf, 4096);
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void (*update)(const void*, size_t, void*);
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void (*final)(void*, void*);
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if(strcmp(filename, "-") == 0) {
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src_fd = STDIN_FILENO;
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} else if(0 > (src_fd = open(filename, O_RDONLY))) {
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bb_perror_msg("%s", filename);
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return NULL;
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}
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// figure specific hash algorithims
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if(ENABLE_MD5SUM && hash_algo==HASH_MD5) {
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md5_begin(&context.md5);
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update = (void (*)(const void*, size_t, void*))md5_hash;
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final = (void (*)(void*, void*))md5_end;
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hash_len = 16;
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} else if(ENABLE_SHA1SUM && hash_algo==HASH_SHA1) {
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sha1_begin(&context.sha1);
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update = (void (*)(const void*, size_t, void*))sha1_hash;
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final = (void (*)(void*, void*))sha1_end;
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hash_len = 20;
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} else {
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bb_error_msg_and_die("algotithm not supported");
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}
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while(0 < (count = read(src_fd, in_buf, sizeof in_buf))) {
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update(in_buf, count, &context);
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}
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if(count == 0) {
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final(in_buf, &context);
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hash_value = hash_bin_to_hex(in_buf, hash_len);
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}
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RELEASE_CONFIG_BUFFER(in_buf);
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if(src_fd != STDIN_FILENO) {
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close(src_fd);
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}
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return hash_value;
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}
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/* This could become a common function for md5 as well, by using md5_stream */
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static int hash_files(int argc, char **argv, hash_algo_t hash_algo)
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{
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int return_value = EXIT_SUCCESS;
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uint8_t *hash_value;
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unsigned int flags;
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if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK)
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flags = bb_getopt_ulflags(argc, argv, "scw");
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if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && !(flags & FLAG_CHECK)) {
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if (flags & FLAG_SILENT) {
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bb_error_msg_and_die
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("the -s option is meaningful only when verifying checksums");
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} else if (flags & FLAG_WARN) {
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bb_error_msg_and_die
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("the -w option is meaningful only when verifying checksums");
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}
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}
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if (argc == optind) {
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argv[argc++] = "-";
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}
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if (ENABLE_FEATURE_MD5_SHA1_SUM_CHECK && flags & FLAG_CHECK) {
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FILE *pre_computed_stream;
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int count_total = 0;
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int count_failed = 0;
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char *file_ptr = argv[optind];
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char *line;
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if (optind + 1 != argc) {
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bb_error_msg_and_die
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("only one argument may be specified when using -c");
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}
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if (strcmp(file_ptr, "-") == 0) {
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pre_computed_stream = stdin;
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} else {
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pre_computed_stream = bb_xfopen(file_ptr, "r");
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}
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while ((line = bb_get_chomped_line_from_file(pre_computed_stream)) != NULL) {
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char *filename_ptr;
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count_total++;
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filename_ptr = strstr(line, " ");
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if (filename_ptr == NULL) {
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if (flags & FLAG_WARN) {
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bb_error_msg("Invalid format");
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}
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count_failed++;
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return_value = EXIT_FAILURE;
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free(line);
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continue;
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}
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*filename_ptr = '\0';
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filename_ptr += 2;
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hash_value = hash_file(filename_ptr, hash_algo);
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if (hash_value && (strcmp((char*)hash_value, line) == 0)) {
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if (!(flags & FLAG_SILENT))
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printf("%s: OK\n", filename_ptr);
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} else {
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if (!(flags & FLAG_SILENT))
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printf("%s: FAILED\n", filename_ptr);
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count_failed++;
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return_value = EXIT_FAILURE;
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}
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/* possible free(NULL) */
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free(hash_value);
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free(line);
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}
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if (count_failed && !(flags & FLAG_SILENT)) {
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bb_error_msg("WARNING: %d of %d computed checksums did NOT match",
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count_failed, count_total);
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}
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if (bb_fclose_nonstdin(pre_computed_stream) == EOF) {
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bb_perror_msg_and_die("Couldnt close file %s", file_ptr);
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}
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} else {
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while (optind < argc) {
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char *file_ptr = argv[optind++];
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hash_value = hash_file(file_ptr, hash_algo);
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if (hash_value == NULL) {
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return_value = EXIT_FAILURE;
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} else {
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printf("%s %s\n", hash_value, file_ptr);
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free(hash_value);
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}
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}
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}
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return (return_value);
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}
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#ifdef CONFIG_MD5SUM
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int md5sum_main(int argc, char **argv)
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{
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return(hash_files(argc, argv, HASH_MD5));
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}
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#endif
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#ifdef CONFIG_SHA1SUM
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int sha1sum_main(int argc, char **argv)
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{
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return(hash_files(argc, argv, HASH_SHA1));
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}
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#endif
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