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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 17:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 17:47:29 +0000 |
commit | 4f5791ebd03eaec1c7da0865a383175b05102712 (patch) | |
tree | 8ce7b00f7a76baa386372422adebbe64510812d4 /lib/util/string_wrappers.h | |
parent | Initial commit. (diff) | |
download | samba-4f5791ebd03eaec1c7da0865a383175b05102712.tar.xz samba-4f5791ebd03eaec1c7da0865a383175b05102712.zip |
Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/util/string_wrappers.h')
-rw-r--r-- | lib/util/string_wrappers.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/lib/util/string_wrappers.h b/lib/util/string_wrappers.h new file mode 100644 index 0000000..00bce07 --- /dev/null +++ b/lib/util/string_wrappers.h @@ -0,0 +1,99 @@ +/* + Unix SMB/CIFS implementation. + + string wrappers, for checking string sizes + + Copyright (C) Andrew Tridgell 1994-2011 + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003 + + 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, see <http://www.gnu.org/licenses/>. +*/ + +#ifndef _STRING_WRAPPERS_H +#define _STRING_WRAPPERS_H + +#include "lib/replace/replace.h" /* for config symbols */ + +#define strlcpy_base(dest, src, base, size) \ +do { \ + const char *_strlcpy_base_src = (const char *)src; \ + strlcpy((dest), _strlcpy_base_src? _strlcpy_base_src : "", (size)-PTR_DIFF((dest),(base))); \ +} while (0) + +/* String copy functions - macro hell below adds 'type checking' (limited, + but the best we can do in C) */ + +#define fstrcpy(d,s) \ +do { \ + const char *_fstrcpy_src = (const char *)(s); \ + strlcpy((d),_fstrcpy_src ? _fstrcpy_src : "",sizeof(fstring)); \ +} while (0) + +#define fstrcat(d,s) \ +do { \ + const char *_fstrcat_src = (const char *)(s); \ + strlcat((d),_fstrcat_src ? _fstrcat_src : "",sizeof(fstring)); \ +} while (0) +#define unstrcpy(d,s) \ +do { \ + const char *_unstrcpy_src = (const char *)(s); \ + strlcpy((d),_unstrcpy_src ? _unstrcpy_src : "",sizeof(unstring)); \ +} while (0) + +#ifdef HAVE_COMPILER_WILL_OPTIMIZE_OUT_FNS + +/* We need a number of different prototypes for our + non-existent fuctions */ +char * __unsafe_string_function_usage_here__(void); + +size_t __unsafe_string_function_usage_here_size_t__(void); + +NTSTATUS __unsafe_string_function_usage_here_NTSTATUS__(void); + +#define CHECK_STRING_SIZE(d, len) (sizeof(d) != (len) && sizeof(d) != sizeof(char *)) + +/* if the compiler will optimize out function calls, then use this to tell if we are + have the correct types (this works only where sizeof() returns the size of the buffer, not + the size of the pointer). */ + +#define push_string_check(dest, src, dest_len, flags) \ + (CHECK_STRING_SIZE(dest, dest_len) \ + ? __unsafe_string_function_usage_here_size_t__() \ + : push_string_check_fn(dest, src, dest_len, flags)) + +#define srvstr_push(base_ptr, smb_flags2, dest, src, dest_len, flags, ret_len) \ + (CHECK_STRING_SIZE(dest, dest_len) \ + ? __unsafe_string_function_usage_here_NTSTATUS__() \ + : srvstr_push_fn(base_ptr, smb_flags2, dest, src, dest_len, flags, ret_len)) + +/* This allows the developer to choose to check the arguments to + strlcpy. if the compiler will optimize out function calls, then + use this to tell if we are have the correct size buffer (this works only + where sizeof() returns the size of the buffer, not the size of the + pointer), so stack and static variables only */ + +#define checked_strlcpy(dest, src, size) \ + (sizeof(dest) != (size) \ + ? __unsafe_string_function_usage_here_size_t__() \ + : strlcpy(dest, src, size)) + +#else + +#define push_string_check push_string_check_fn +#define srvstr_push srvstr_push_fn +#define checked_strlcpy strlcpy + +#endif + +#endif |