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New API call iso_util_get_lfa_masks()

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This commit is contained in:
Thomas Schmitt 2024-07-19 22:24:02 +02:00
parent fbcacafb49
commit 99700ac94b
4 changed files with 76 additions and 19 deletions
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38
libisofs/fs_local.c
View File

@ -975,7 +975,7 @@ int iso_local_get_lfa_flags(char *disk_path, uint64_t *lfa_flags, int *max_bit,
}
if ((stbuf.st_mode & S_IFMT) == S_IFLNK && !(flag & 32))
return 3;
ret= aaip_get_lfa_flags(disk_path, lfa_flags, max_bit, os_errno, 0);
ret = aaip_get_lfa_flags(disk_path, lfa_flags, max_bit, os_errno, 0);
if(ret == 0)
return ISO_AAIP_NOT_ENABLED;
if (ret < 0)
@ -986,8 +986,8 @@ int iso_local_get_lfa_flags(char *disk_path, uint64_t *lfa_flags, int *max_bit,
/*
* @param flag Bitfield for control purposes
* bit0= do not try to set known superuser flags
* bit1= set only known chattr settable flags
* bit0= do not try to change known superuser flags
* bit1= change only known chattr settable flags
* bit5= in case of symbolic link: inquire link target
* @return
* 1 = ok, all lfa_flags bits were written
@ -996,18 +996,14 @@ int iso_local_get_lfa_flags(char *disk_path, uint64_t *lfa_flags, int *max_bit,
* <0 = error
*/
int iso_local_set_lfa_flags(char *disk_path, uint64_t lfa_flags, int max_bit,
int *os_errno, int flag)
uint64_t change_mask, int *os_errno, int flag)
{
int ret;
int ret, old_max_bit;
struct stat stbuf;
uint64_t known_user_mask, known_su_mask, non_settable, unknown, eff_flags;
/* chattr letters: User: sucSdAmtDTCxPF
Superuser: iaj
Non-settable: Z(9)EI(13)heV(21)(22)N(31)
*/
static uint64_t known_user_mask = 0x628384cf;
static uint64_t known_su_mask = 0x00004030;
iso_util_get_lfa_masks(&known_user_mask, &known_su_mask, &non_settable,
&unknown);
*os_errno = 0;
if (flag & 32)
ret = stat(disk_path, &stbuf);
@ -1020,10 +1016,22 @@ int iso_local_set_lfa_flags(char *disk_path, uint64_t lfa_flags, int max_bit,
if ((stbuf.st_mode & S_IFMT) == S_IFLNK && !(flag & 32))
return 3;
if (flag & 1)
lfa_flags &= ~known_su_mask;
change_mask &= ~known_su_mask;
if (flag & 2)
lfa_flags &= known_user_mask | known_su_mask;
ret= aaip_set_lfa_flags(disk_path, lfa_flags, max_bit, os_errno, 0);
change_mask &= (known_user_mask | known_su_mask);
if (change_mask == ~((uint64_t) 0)) {
eff_flags = lfa_flags;
} else {
ret = aaip_get_lfa_flags(disk_path, &eff_flags, &old_max_bit, os_errno,
0);
if (ret == 0)
return ISO_AAIP_NOT_ENABLED;
if (ret < 0)
return ISO_AAIP_NO_GET_LOCAL;
eff_flags &= ~change_mask;
eff_flags |= (lfa_flags & change_mask);
}
ret= aaip_set_lfa_flags(disk_path, eff_flags, max_bit, os_errno, 0);
if(ret == 0)
return ISO_AAIP_NOT_ENABLED;
if(ret < 0)

39
libisofs/libisofs.h
View File

@ -8089,10 +8089,15 @@ int iso_local_get_lfa_flags(char *disk_path, uint64_t *lfa_flags, int *max_bit,
* @param os_errno
* Will get filled with errno if a system call fails.
* Else it will be filled with 0.
* @param change_mask
* Tells which bits of lfa_flags are meant to change attribute flags
* of the file. Submit ~((uint64_t) 0) if all bits may cause changes.
* The set of changeable bits may further be restricted by bit0 and bit1
* of parameter flag.
* @param flag
* Bitfield for control purposes
* bit0= do not try to set known chattr superuser flags: iaj
* bit1= set only known chattr settable flags: sucSiadAmjtDTCxPF
* bit0= do not try to change known chattr superuser flags: iaj
* bit1= change only known chattr settable flags: sucSiadAmjtDTCxPF
* bit5= in case of symbolic link: operate on link target
* @return
* 1 = ok, all lfa_flags bits were written
@ -8103,7 +8108,7 @@ int iso_local_get_lfa_flags(char *disk_path, uint64_t *lfa_flags, int *max_bit,
* @since 1.5.8
*/
int iso_local_set_lfa_flags(char *disk_path, uint64_t lfa_flags, int max_bit,
int *os_errno, int flag);
uint64_t change_mask, int *os_errno, int flag);
/**
@ -8152,6 +8157,34 @@ int iso_util_encode_lfa_flags(uint64_t lfa_flags, char **flags_text, int flag);
int iso_util_decode_lfa_flags(char *flags_text, uint64_t *lfa_flags, int flag);
/**
* Return the bit patterns of four classes of Linux-like file attribute flags.
* They were determined according to man 1 chattr and the source of lsattr
* in juli 2024. The symbolic strings and bit numbers are given here only
* for convenience. Decisive are the returned bit patterns.
*
* @param user_settable
* The flag bits which are known to be user settable with chattr:
* sucSdAmtDTCxPF
* @param su_settable
* The flag bits which are known to be settable with chattr only by
* bearers of various superuser powers:
* iaj
* @param non_settable
* The flags bits which are known to be not settable or not clearable
* by chattr or only known to lsattr:
* ZEIheVN
* @param unknown
* The flags bits for which no symbolic letter is known. Some of them are
* defined in <linux/fs.h> with sparse info, some not even that:
* 9, 13, 21, 22, 24, 26, 27, 31
*
* @since 1.5.8
*/
void iso_util_get_lfa_masks(uint64_t *user_settable, uint64_t *su_settable,
uint64_t *non_settable, uint64_t *unknown);
/* Default in case that the compile environment has no macro PATH_MAX.
*/
#define Libisofs_default_path_maX 4096

1
libisofs/libisofs.ver
View File

@ -392,5 +392,6 @@ iso_node_get_lfa_flags;
iso_node_set_lfa_flags;
iso_util_decode_lfa_flags;
iso_util_encode_lfa_flags;
iso_util_get_lfa_masks;
} LIBISOFS6;

17
libisofs/util.c
View File

@ -2555,7 +2555,7 @@ int iso_util_encode_lfa_flags(uint64_t lfa_flags, char **flags_text, int flag)
(*flags_text)[w++] = lfa_flag_letters[i];
}
}
flags_text[w] = 0;
(*flags_text)[w] = 0;
if (was_unknown)
return ISO_LFA_UNKNOWN_BIT;
return ISO_SUCCESS;
@ -2610,3 +2610,18 @@ int iso_util_decode_lfa_flags(char *flags_text, uint64_t *lfa_flags, int flag)
return 1;
}
void iso_util_get_lfa_masks(uint64_t *user_settable, uint64_t *su_settable,
uint64_t *non_settable, uint64_t *unknown)
{
/* chattr letters: User settable : sucSdAmtDTCxPF
Superuser settable: iaj
Non-settable : ZEIheVN
unknown : 9, 13, 21, 22, 24, 26, 27, >= 31
*/
*user_settable = 0x628384cf;
*su_settable = 0x00004030;
*non_settable = 0x101c1900;
*unknown = 0xffffffff8d602200;
}