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We need to mask the first part with 0xFFFF or there is a slight chance an
unrelated error code would match even if the upper part is not exactly
equal to ERR_BASE but just has all it's bits and some more.
Also make the macro more reasable by adding another helper macro for filtering
the base.
Finally compare err and ERR_LAST directly w/o masking err, or the comparison
will always return true.
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Use the new internal SSSD errors, to simplify error handling.
Instead of using up to 3 different error types (system, krb5 and
pam_status), collapse all error reporting into one error type mapped
on errno_t.
The returned error can contain either SSSD internal errors, kerberos
errors or system errors, they all use different number spaces so there
is no overlap and they can be safely merged.
This means that errors being sent from the child to the parent are not
pam status error messages anymore.
The callers have been changed to properly deal with that.
Also note that this patch removes returning SSS_PAM_SYSTEM_INFO from
the krb5_child for kerberos errors as all it was doing was simply to
make the parent emit the same debug log already emitted by the child,
and the code is simpler if we do not do that.
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This prevents reportin false errors when internal functions return
a generic EINVAL or EACCES that should just be treated as internal
errors.
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This code adds a new range of error codes specific to SSSD,
It also provides helper functions to print out error defintions
like you can do with system error messages and the strerror() function.
The sss_strerror() function can accept both the new sssd errors and
system errno_t errors falling back to the system strerror() if the error
code provide is not a valid SSSD error code.
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