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// Copyright (C) 2002 Andrew Tridgell
// Copyright (C) 2010-2018 Joel Rosdahl
//
// 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 3 of the License, or (at your option)
// 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
#include "ccache.h"
#define HASH_DELIMITER "\000cCaChE"
#define HASH_DEBUG_DELIMITER "### "
// binary input, for hashing
static char *debug_hash_bin;
// text input, for debugging
static char *debug_hash_txt;
// char mapping to open files
static FILE **debug_hash_file;
void hash_debug_init(const char *bin, const char *txt)
{
debug_hash_file = x_calloc(256, sizeof(FILE *));
static char *hash_types = "cdp"; // common, direct, cpp
if (bin) {
debug_hash_bin = x_strdup(bin);
assert(debug_hash_bin[strlen(debug_hash_bin)-1] == 'X');
for (char *p = hash_types; *p != '\0'; p++) {
debug_hash_bin[strlen(debug_hash_bin)-1] = *p;
debug_hash_file[(int) *p] = fopen(debug_hash_bin, "wb");
}
debug_hash_bin[strlen(debug_hash_bin)-1] = 'X';
}
if (txt) {
debug_hash_txt = x_strdup(txt);
debug_hash_file[(int) 't'] = fopen(debug_hash_txt, "w");
}
}
void hash_debug_end()
{
for (int i = 0; i < 256; i++) {
if (debug_hash_file[i] != NULL) {
fclose(debug_hash_file[i]);
}
}
}
static void
hash_binary_buffer(struct mdfour *md, const void *s, size_t len)
{
mdfour_update(md, (const unsigned char *)s, len);
if (!md->identifier || len == 0) {
return;
}
if (debug_hash_bin) {
// log to different files, for the different hash types
fwrite(s, 1, len, debug_hash_file[md->identifier]);
}
}
static void
hash_debug_buffer(struct mdfour *md, const void *s, size_t len)
{
if (!md->identifier || len == 0) {
return;
}
if (debug_hash_txt) {
fwrite(s, 1, len, debug_hash_file['t']);
}
}
void
hash_start(struct mdfour *md)
{
mdfour_begin(md);
}
void
hash_section(struct mdfour *md, const char *name)
{
hash_debug_buffer(md, "=== ", 4);
hash_debug_buffer(md, name, strlen(name));
hash_debug_buffer(md, " ===", 4);
hash_debug_buffer(md, "\n", 1);
}
void
hash_buffer(struct mdfour *md, const void *s, size_t len)
{
hash_binary_buffer(md, s, len);
hash_debug_buffer(md, s, len);
}
// Return the hash result as a hex string. Caller frees.
char *
hash_result(struct mdfour *md)
{
unsigned char sum[16];
hash_result_as_bytes(md, sum);
return format_hash_as_string(sum, (unsigned) md->totalN);
}
// Return the hash result as 16 binary bytes.
void
hash_result_as_bytes(struct mdfour *md, unsigned char *out)
{
mdfour_update(md, NULL, 0);
mdfour_result(md, out);
}
bool
hash_equal(struct mdfour *md1, struct mdfour *md2)
{
unsigned char sum1[16];
hash_result_as_bytes(md1, sum1);
unsigned char sum2[16];
hash_result_as_bytes(md2, sum2);
return memcmp(sum1, sum2, sizeof(sum1)) == 0;
}
// Hash some data that is unlikely to occur in the input. The idea is twofold:
//
// - Delimit things like arguments from each other (e.g., so that -I -O2 and
// -I-O2 hash differently).
// - Tag different types of hashed information so that it's possible to do
// conditional hashing of information in a safe way (e.g., if we want to hash
// information X if CCACHE_A is set and information Y if CCACHE_B is set,
// there should never be a hash collision risk).
void
hash_delimiter(struct mdfour *md, const char *type)
{
hash_binary_buffer(md, HASH_DELIMITER, sizeof(HASH_DELIMITER));
hash_binary_buffer(md, type, strlen(type) + 1); // Include NUL.
hash_debug_buffer(md, HASH_DEBUG_DELIMITER, strlen(HASH_DEBUG_DELIMITER));
hash_debug_buffer(md, type, strlen(type));
hash_debug_buffer(md, "\n", 1);
}
void
hash_string(struct mdfour *md, const char *s)
{
hash_string_length(md, s, strlen(s));
}
void
hash_string_length(struct mdfour *md, const char *s, int length)
{
hash_binary_buffer(md, s, length);
hash_debug_buffer(md, s, length);
hash_debug_buffer(md, "\n", 1);
}
void
hash_int(struct mdfour *md, int x)
{
hash_binary_buffer(md, (char *)&x, sizeof(x));
char buf[16];
snprintf(buf, sizeof(buf), "%d", x);
hash_debug_buffer(md, buf, strlen(buf));
hash_debug_buffer(md, "\n", 1);
}
// Add contents of an open file to the hash. Returns true on success, otherwise
// false.
bool
hash_fd(struct mdfour *md, int fd)
{
char buf[READ_BUFFER_SIZE];
ssize_t n;
while ((n = read(fd, buf, sizeof(buf))) != 0) {
if (n == -1 && errno != EINTR) {
break;
}
if (n > 0) {
hash_binary_buffer(md, buf, n);
hash_debug_buffer(md, buf, n);
}
}
return n == 0;
}
// Add contents of a file to the hash. Returns true on success, otherwise
// false.
bool
hash_file(struct mdfour *md, const char *fname)
{
int fd = open(fname, O_RDONLY|O_BINARY);
if (fd == -1) {
cc_log("Failed to open %s: %s", fname, strerror(errno));
return false;
}
bool ret = hash_fd(md, fd);
close(fd);
return ret;
}
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