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.\" $Id: krb5_storage.3 17884 2006-08-18 08:41:09Z lha $
.\"
.Dd Aug 18, 2006
.Dt KRB5_STORAGE 3
.Os HEIMDAL
.Sh NAME
.Nm krb5_storage ,
.Nm krb5_storage_emem ,
.Nm krb5_storage_from_data ,
.Nm krb5_storage_from_fd ,
.Nm krb5_storage_from_mem ,
.Nm krb5_storage_set_flags ,
.Nm krb5_storage_clear_flags ,
.Nm krb5_storage_is_flags ,
.Nm krb5_storage_set_byteorder ,
.Nm krb5_storage_get_byteorder ,
.Nm krb5_storage_set_eof_code ,
.Nm krb5_storage_seek ,
.Nm krb5_storage_read ,
.Nm krb5_storage_write ,
.Nm krb5_storage_free ,
.Nm krb5_storage_to_data ,
.Nm krb5_store_int32 ,
.Nm krb5_ret_int32 ,
.Nm krb5_store_uint32 ,
.Nm krb5_ret_uint32 ,
.Nm krb5_store_int16 ,
.Nm krb5_ret_int16 ,
.Nm krb5_store_uint16 ,
.Nm krb5_ret_uint16 ,
.Nm krb5_store_int8 ,
.Nm krb5_ret_int8 ,
.Nm krb5_store_uint8 ,
.Nm krb5_ret_uint8 ,
.Nm krb5_store_data ,
.Nm krb5_ret_data ,
.Nm krb5_store_string ,
.Nm krb5_ret_string ,
.Nm krb5_store_stringnl ,
.Nm krb5_ret_stringnl ,
.Nm krb5_store_stringz ,
.Nm krb5_ret_stringz ,
.Nm krb5_store_principal ,
.Nm krb5_ret_principal ,
.Nm krb5_store_keyblock ,
.Nm krb5_ret_keyblock ,
.Nm krb5_store_times ,
.Nm krb5_ret_times ,
.Nm krb5_store_address ,
.Nm krb5_ret_address ,
.Nm krb5_store_addrs ,
.Nm krb5_ret_addrs ,
.Nm krb5_store_authdata ,
.Nm krb5_ret_authdata ,
.Nm krb5_store_creds ,
.Nm krb5_ret_creds
.Nd operates on the Kerberos datatype krb5_storage
.Sh LIBRARY
Kerberos 5 Library (libkrb5, -lkrb5)
.Sh SYNOPSIS
.In krb5.h
.Pp
.Li "struct krb5_storage;"
.Pp
.Ft "krb5_storage *"
.Fn krb5_storage_from_fd "int fd"
.Ft "krb5_storage *"
.Fn krb5_storage_emem "void"
.Ft "krb5_storage *"
.Fn krb5_storage_from_mem "void *buf" "size_t len"
.Ft "krb5_storage *"
.Fn krb5_storage_from_data "krb5_data *data"
.Ft void
.Fn krb5_storage_set_flags "krb5_storage *sp" "krb5_flags flags"
.Ft void
.Fn krb5_storage_clear_flags "krb5_storage *sp" "krb5_flags flags"
.Ft krb5_boolean
.Fn krb5_storage_is_flags "krb5_storage *sp" "krb5_flags flags"
.Ft void
.Fn krb5_storage_set_byteorder "krb5_storage *sp" "krb5_flags byteorder"
.Ft krb5_flags
.Fn krb5_storage_get_byteorder "krb5_storage *sp" "krb5_flags byteorder"
.Ft void
.Fn krb5_storage_set_eof_code "krb5_storage *sp" "int code"
.Ft off_t
.Fn krb5_storage_seek "krb5_storage *sp" "off_t offset" "int whence"
.Ft krb5_ssize_t
.Fn krb5_storage_read "krb5_storage *sp" "void *buf" "size_t len"
.Ft krb5_ssize_t
.Fn krb5_storage_write "krb5_storage *sp" "const void *buf" "size_t len"
.Ft krb5_error_code
.Fn krb5_storage_free "krb5_storage *sp"
.Ft krb5_error_code
.Fn krb5_storage_to_data "krb5_storage *sp" "krb5_data *data"
.Ft krb5_error_code
.Fn krb5_store_int32 "krb5_storage *sp" "int32_t value"
.Ft krb5_error_code
.Fn krb5_ret_int32 "krb5_storage *sp" "int32_t *value"
.Ft krb5_error_code
.Fn krb5_ret_uint32 "krb5_storage *sp" "uint32_t *value"
.Ft krb5_error_code
.Fn krb5_store_uint32 "krb5_storage *sp" "uint32_t value"
.Ft krb5_error_code
.Fn krb5_store_int16 "krb5_storage *sp" "int16_t value"
.Ft krb5_error_code
.Fn krb5_ret_int16 "krb5_storage *sp" "int16_t *value"
.Ft krb5_error_code
.Fn krb5_store_uint16 "krb5_storage *sp" "uint16_t value"
.Ft krb5_error_code
.Fn krb5_ret_uint16 "krb5_storage *sp" "u_int16_t *value"
.Ft krb5_error_code
.Fn krb5_store_int8 "krb5_storage *sp" "int8_t value"
.Ft krb5_error_code
.Fn krb5_ret_int8 "krb5_storage *sp" "int8_t *value"
.Ft krb5_error_code
.Fn krb5_store_uint8 "krb5_storage *sp" "u_int8_t value"
.Ft krb5_error_code
.Fn krb5_ret_uint8 "krb5_storage *sp" "u_int8_t *value"
.Ft krb5_error_code
.Fn krb5_store_data "krb5_storage *sp" "krb5_data data"
.Ft krb5_error_code
.Fn krb5_ret_data "krb5_storage *sp" "krb5_data *data"
.Ft krb5_error_code
.Fn krb5_store_string "krb5_storage *sp" "const char *s"
.Ft krb5_error_code
.Fn krb5_ret_string "krb5_storage *sp" "char **string"
.Ft krb5_error_code
.Fn krb5_store_stringnl "krb5_storage *sp" "const char *s"
.Ft krb5_error_code
.Fn krb5_ret_stringnl "krb5_storage *sp" "char **string"
.Ft krb5_error_code
.Fn krb5_store_stringz "krb5_storage *sp" "const char *s"
.Ft krb5_error_code
.Fn krb5_ret_stringz "krb5_storage *sp" "char **string"
.Ft krb5_error_code
.Fn krb5_store_principal "krb5_storage *sp" "krb5_const_principal p"
.Ft krb5_error_code
.Fn krb5_ret_principal "krb5_storage *sp" "krb5_principal *princ"
.Ft krb5_error_code
.Fn krb5_store_keyblock "krb5_storage *sp" "krb5_keyblock p"
.Ft krb5_error_code
.Fn krb5_ret_keyblock "krb5_storage *sp" "krb5_keyblock *p"
.Ft krb5_error_code
.Fn krb5_store_times "krb5_storage *sp" "krb5_times times"
.Ft krb5_error_code
.Fn krb5_ret_times "krb5_storage *sp" "krb5_times *times"
.Ft krb5_error_code
.Fn krb5_store_address "krb5_storage *sp" "krb5_address p"
.Ft krb5_error_code
.Fn krb5_ret_address "krb5_storage *sp" "krb5_address *adr"
.Ft krb5_error_code
.Fn krb5_store_addrs "krb5_storage *sp" "krb5_addresses p"
.Ft krb5_error_code
.Fn krb5_ret_addrs "krb5_storage *sp" "krb5_addresses *adr"
.Ft krb5_error_code
.Fn krb5_store_authdata "krb5_storage *sp" "krb5_authdata auth"
.Ft krb5_error_code
.Fn krb5_ret_authdata "krb5_storage *sp" "krb5_authdata *auth"
.Ft krb5_error_code
.Fn krb5_store_creds "krb5_storage *sp" "krb5_creds *creds"
.Ft krb5_error_code
.Fn krb5_ret_creds "krb5_storage *sp" "krb5_creds *creds"
.Sh DESCRIPTION
The
.Li krb5_storage
structure holds a storage element that is used for data manipulation.
The structure contains no public accessible elements.
.Pp
.Fn krb5_storage_emem
create a memory based krb5 storage unit that dynamicly resized to the
ammount of data stored in.
The storage never returns errors, on memory allocation errors
.Xr exit 3
will be called.
.Pp
.Fn krb5_storage_from_data
create a krb5 storage unit that will read is data from a
.Li krb5_data .
There is no copy made of the
.Fa data ,
so the caller must not free
.Fa data
until the storage is freed.
.Pp
.Fn krb5_storage_from_fd
create a krb5 storage unit that will read is data from a
file descriptor.
The descriptor must be seekable if
.Fn krb5_storage_seek
is used.
Caller must not free the file descriptor before the storage is freed.
.Pp
.Fn krb5_storage_from_mem
create a krb5 storage unit that will read is data from a
memory region.
There is no copy made of the
.Fa data ,
so the caller must not free
.Fa data
until the storage is freed.
.Pp
.Fn krb5_storage_set_flags
and
.Fn krb5_storage_clear_flags
modifies the behavior of the storage functions.
.Fn krb5_storage_is_flags
tests if the
.Fa flags
are set on the
.Li krb5_storage .
Valid flags to set, is and clear is are:
.Pp
.Bl -tag -width "Fan vet..." -compact -offset indent
.It KRB5_STORAGE_PRINCIPAL_WRONG_NUM_COMPONENTS
Stores the number of principal componets one too many when storing
principal namees, used for compatibility with version 1 of file
keytabs and version 1 of file credential caches.
.It KRB5_STORAGE_PRINCIPAL_NO_NAME_TYPE
Doesn't store the name type in when storing a principal name, used for
compatibility with version 1 of file keytabs and version 1 of file
credential caches.
.It KRB5_STORAGE_KEYBLOCK_KEYTYPE_TWICE
Stores the keyblock type twice storing a keyblock, used for
compatibility version 3 of file credential caches.
.It KRB5_STORAGE_BYTEORDER_MASK
bitmask that can be used to and out what type of byte order order is used.
.It KRB5_STORAGE_BYTEORDER_BE
Store integers in in big endian byte order, this is the default mode.
.It KRB5_STORAGE_BYTEORDER_LE
Store integers in in little endian byte order.
.It KRB5_STORAGE_BYTEORDER_HOST
Stores the integers in host byte order, used for compatibility with
version 1 of file keytabs and version 1 and 2 of file credential
caches.
.It KRB5_STORAGE_CREDS_FLAGS_WRONG_BITORDER
Store the credential flags in a krb5_creds in the reverse bit order.
.El
.Pp
.Fn krb5_storage_set_byteorder
and
.Fn krb5_storage_get_byteorder
modifies the byte order used in the storage for integers.
The flags used is same as above.
The valid flags are
.Dv KRB5_STORAGE_BYTEORDER_BE ,
.Dv KRB5_STORAGE_BYTEORDER_LE
and
.Dv KRB5_STORAGE_BYTEORDER_HOST .
.Pp
.Fn krb5_storage_set_eof_code
sets the error code that will be returned on end of file condition to
.Fa code .
.Pp
.Fn krb5_storage_seek
seeks
.Fa offset
bytes in the storage
.Fa sp .
The
.Fa whence
argument is one of
.Bl -tag -width SEEK_SET -compact -offset indent
.It SEEK_SET
offset is from begining of storage.
.It SEEK_CUR
offset is relative from current offset.
.It SEEK_END
offset is from end of storage.
.El
.Pp
.Fn krb5_storage_read
reads
.Fa len
(or less bytes in case of end of file) into
.Fa buf
from the current offset in the storage
.Fa sp .
.Pp
.Fn krb5_storage_write
writes
.Fa len
or (less bytes in case of end of file) from
.Fa buf
from the current offset in the storage
.Fa sp .
.Pp
.Fn krb5_storage_free
frees the storage
.Fa sp .
.Pp
.Fn krb5_storage_to_data
converts the data in storage
.Fa sp
into a
.Li krb5_data
structure.
.Fa data
must be freed with
.Fn krb5_data_free
by the caller when done with the
.Fa data .
.Pp
All
.Li krb5_store
and
.Li krb5_ret
functions move the current offset forward when the functions returns.
.Pp
.Fn krb5_store_int32 ,
.Fn krb5_ret_int32 ,
.Fn krb5_store_uint32 ,
.Fn krb5_ret_uint32 ,
.Fn krb5_store_int16 ,
.Fn krb5_ret_int16 ,
.Fn krb5_store_uint16 ,
.Fn krb5_ret_uint16 ,
.Fn krb5_store_int8 ,
.Fn krb5_ret_int8 
.Fn krb5_store_uint8 ,
and
.Fn krb5_ret_uint8 
stores and reads an integer from
.Fa sp
in the byte order specified by the flags set on the
.Fa sp .
.Pp
.Fn krb5_store_data
and
.Fn krb5_ret_data
store and reads a krb5_data.
The length of the data is stored with
.Fn krb5_store_int32 .
.Pp
.Fn krb5_store_string
and
.Fn krb5_ret_string
store and reads a string by storing the length of the string with
.Fn krb5_store_int32
followed by the string itself.
.Pp
.Fn krb5_store_stringnl
and 
.Fn krb5_ret_stringnl
store and reads a string by storing string followed by a
.Dv '\n' .
.Pp
.Fn krb5_store_stringz
and 
.Fn krb5_ret_stringz
store and reads a string by storing string followed by a
.Dv NUL .
.Pp
.Fn krb5_store_principal
and
.Fn krb5_ret_principal
store and reads a principal.
.Pp
.Fn krb5_store_keyblock
and
.Fn krb5_ret_keyblock
store and reads a
.Li krb5_keyblock .
.Pp
.Fn krb5_store_times
.Fn krb5_ret_times
store and reads
.Li krb5_times 
structure .
.Pp
.Fn krb5_store_address
and
.Fn krb5_ret_address
store and reads a 
.Li krb5_address .
.Pp
.Fn krb5_store_addrs
and
.Fn krb5_ret_addrs
store and reads a 
.Li krb5_addresses .
.Pp
.Fn krb5_store_authdata
and
.Fn krb5_ret_authdata
store and reads a
.Li krb5_authdata .
.Pp
.Fn krb5_store_creds
and
.Fn krb5_ret_creds
store and reads a
.Li krb5_creds .
.Sh SEE ALSO
.Xr krb5 3 ,
.Xr krb5_data 3 ,
.Xr kerberos 8