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/* ldbuildid.c - Build Id support routines
Copyright (C) 2013-2025 Free Software Foundation, Inc.
This file is part of the GNU Binutils.
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 "sysdep.h"
#include "bfd.h"
#include "safe-ctype.h"
#include "md5.h"
#include "sha1.h"
#ifdef WITH_XXHASH
#define XXH_INLINE_ALL
#include <xxhash.h>
#endif
#include "ldbuildid.h"
#ifdef __MINGW32__
#include <windows.h>
#include <rpcdce.h>
#endif
#define streq(a,b) strcmp ((a), (b)) == 0
bool
validate_build_id_style (const char *style)
{
if ((streq (style, "md5")) || (streq (style, "sha1"))
#ifdef WITH_XXHASH
|| (streq (style, "xx"))
#endif
|| (streq (style, "uuid")) || (startswith (style, "0x")))
return true;
return false;
}
bfd_size_type
compute_build_id_size (const char *style)
{
if (streq (style, "md5") || streq (style, "uuid"))
return 128 / 8;
#ifdef WITH_XXHASH
if (streq (style, "xx"))
return 128 / 8;
#endif
if (streq (style, "sha1"))
return 160 / 8;
if (startswith (style, "0x"))
{
bfd_size_type size = 0;
/* ID is in string form (hex). Count the bytes. */
const char *id = style + 2;
do
{
if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
{
++size;
id += 2;
}
else if (*id == '-' || *id == ':')
++id;
else
{
size = 0;
break;
}
} while (*id != '\0');
return size;
}
return 0;
}
static unsigned char
read_hex (const char xdigit)
{
if (ISDIGIT (xdigit))
return xdigit - '0';
if (ISUPPER (xdigit))
return xdigit - 'A' + 0xa;
if (ISLOWER (xdigit))
return xdigit - 'a' + 0xa;
abort ();
return 0;
}
#ifdef WITH_XXHASH
static void
xx_process_bytes(const void* buffer, size_t size, void* state)
{
XXH3_128bits_update ((XXH3_state_t*) state, buffer, size);
}
#endif
bool
generate_build_id (bfd *abfd,
const char *style,
checksum_fn checksum_contents,
unsigned char *id_bits,
int size ATTRIBUTE_UNUSED)
{
#ifdef WITH_XXHASH
if (streq (style, "xx"))
{
XXH3_state_t* state = XXH3_createState ();
if (!state)
{
return false;
}
XXH3_128bits_reset (state);
if (!(*checksum_contents) (abfd, &xx_process_bytes, state))
{
XXH3_freeState (state);
return false;
}
XXH128_hash_t result = XXH3_128bits_digest (state);
XXH3_freeState (state);
/* Use canonical-endianness output. */
XXH128_canonical_t result_canon;
XXH128_canonicalFromHash (&result_canon, result);
memcpy (id_bits, &result_canon,
(size_t) size < sizeof (result) ? (size_t) size : sizeof (result));
}
else
#endif
if (streq (style, "md5"))
{
struct md5_ctx ctx;
md5_init_ctx (&ctx);
if (!(*checksum_contents) (abfd, (sum_fn) &md5_process_bytes, &ctx))
return false;
md5_finish_ctx (&ctx, id_bits);
}
else if (streq (style, "sha1"))
{
struct sha1_ctx ctx;
sha1_init_ctx (&ctx);
if (!(*checksum_contents) (abfd, (sum_fn) sha1_choose_process_bytes (),
&ctx))
return false;
sha1_finish_ctx (&ctx, id_bits);
}
else if (streq (style, "uuid"))
{
#ifndef __MINGW32__
int n;
int fd = open ("/dev/urandom", O_RDONLY);
if (fd < 0)
return false;
n = read (fd, id_bits, size);
close (fd);
if (n < size)
return false;
#else /* __MINGW32__ */
typedef RPC_STATUS (RPC_ENTRY * UuidCreateFn) (UUID *);
UUID uuid;
UuidCreateFn uuid_create = 0;
HMODULE rpc_library = LoadLibrary ("rpcrt4.dll");
if (!rpc_library)
return false;
uuid_create = (UuidCreateFn) (void (WINAPI *)(void)) GetProcAddress (rpc_library, "UuidCreate");
if (!uuid_create)
{
FreeLibrary (rpc_library);
return false;
}
if (uuid_create (&uuid) != RPC_S_OK)
{
FreeLibrary (rpc_library);
return false;
}
FreeLibrary (rpc_library);
memcpy (id_bits, &uuid,
(size_t) size < sizeof (UUID) ? (size_t) size : sizeof (UUID));
#endif /* __MINGW32__ */
}
else if (startswith (style, "0x"))
{
/* ID is in string form (hex). Convert to bits. */
const char *id = style + 2;
size_t n = 0;
do
{
if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
{
id_bits[n] = read_hex (*id++) << 4;
id_bits[n++] |= read_hex (*id++);
}
else if (*id == '-' || *id == ':')
++id;
else
abort (); /* Should have been validated earlier. */
}
while (*id != '\0');
}
else
abort (); /* Should have been validated earlier. */
return true;
}
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