SLAPD-TCL(5)SLAPD-TCL(5)NAMEslapd-tcl - Tcl backend to slapd
SYNOPSIS
ETCDIR/slapd.conf
DESCRIPTION
The Tcl backend to slapd(8) works by embedding a Tcl(3tcl)
interpreter into slapd(8). Any tcl database section of
the configuration file slapd.conf(5) must then specify
what Tcl script to use.
This backend is experimental.
WARNING
This backend's calling conventions have changed since
OpenLDAP 2.0. Previously, the 2nd argument to the procs
was a message ID. Now they are an "operation ID" string.
Also, proc abandon now gets a new abandonid argument.
CONFIGURATION
These slapd.conf options apply to the TCL backend
database. That is, they must follow a "database tcl" line
and come before any subsequent "backend" or "database"
lines. Other database options are described in the
slapd.conf(5) manual page.
scriptpath <filename.tcl>
The full path to the tcl script used for this
database.
search <proc>
add <proc>
delete <proc>
modify <proc>
bind <proc>
unbind <proc>
modrdn <proc>
compare <proc>
abandon <proc>
The procs for each ldap function. They refer to
the tcl procs in the `scriptpath' script that han-
dles them.
tclrealm <interpreter name>
This is one of the biggest pluses of using the tcl
backend. The realm lets you group several
databases to the same interpreter. This basically
means they share the same global variables and proc
space. So global variables, as well as all the
procs, are callable between databases. If no
tclrealm is specified, it is put into the "default"
realm.
Variables passed to the procs
abandon { action opid suffix abandonid }
action - Always equal to ABANDON.
opid - The opid of this ldap operation.
suffix - List of suffix(es) associated with the
call. Each one is an entry in a tcl
formatted list (surrounded by {}'s).
abandonid - The opid of the operation to abandon.
add { action opid suffix entry }
action - Always equal to ADD.
opid - The opid of this ldap operation.
suffix - List of suffix(es), as above.
entry - Full entry to add. Each "type: val" is
an element in a tcl formatted list.
bind { action opid suffix dn method cred_len cred }
action - Always equal to BIND.
opid - The opid of this ldap operation.
suffix - List of suffix(es), as above.
dn - DN being bound to.
method - One of the ldap authentication methods.
cred_len - Length of cred.
cred - Credentials being used to authenticate,
according to RFC. If this value is empty,
then it should be considered an anonymous
bind (??)
compare { action opid suffix dn ava_type ava_value }
action - Always equal to COMPARE.
opid - The opid of this ldap operation.
suffix - List of suffix(es), as above.
dn - DN for compare.
ava_type - Type for comparison.
ava_value - Value to compare.
delete { action opid suffix dn }
action - Always equal to DELETE.
opid - The opid of this ldap operation.
suffix - List of suffix(es), as above.
dn - DN to delete.
modify { action opid suffix dn mods }
action - Always equal to MODIFY.
opid - The opid of this ldap operation.
suffix - List of suffix(es), as above.
dn - DN to modify.
mods - Tcl list of modifications.
The list is formatted in this way:
{
{ {op: type} {type: val} }
{ {op: type} {type: val} {type: val} }
...
}
Newlines are not present in the actual var,
they are present here for clarification.
"op" is the type of modification
(ADD, DELETE, REPLACE).
modrdn { action opid suffix dn newrdn deleteoldrdn }
action - Always equal to MODRDN.
opid - The opid of this ldap operation.
suffix - List of suffix(es), as above.
dn - DN whose RDN is being renamed.
newrdn - New RDN.
deleteoldrdn - Boolean stating whether or not the
old RDN should be removed after being renamed.
search { action opid suffix base scope deref sizelimit
timelimit filterstr attrsonly attrlist }
action - Always equal to SEARCH.
opid - The opid of this ldap operation.
suffix - List of suffix(es), as above.
base - Base for this search.
scope - Scope of search, ( 0 | 1 | 2 ).
deref - Alias dereferencing ( 0 | 1 | 2 | 3 ).
sizelimit - Maximum number of entries to return.
timelimit - Time limit for search.
filterstr - Filter string as sent by the requester.
attrsonly - Boolean for whether to list only the
attributes, and not values as well.
attrlist - Tcl list if to retrieve.
unbind { action opid suffix dn }
action - Always equal to UNBIND.
opid - The opid of this ldap operation.
suffix - List of suffix(es), as above.
dn - DN to unbind.
An opid (operation ID) is a "connection ID/message ID"
string identifying an operation.
Return Method and Syntax
There are only 2 return types. All procs must return a
result to show status of the operation. The result is in
this form:
{ RESULT {code: <integer>} {matched: <partialdn>}
{info: <string>} {} }
This is best accomplished with this type of tcl code
lappend ret_val "RESULT"
lappend ret_val "code: 0"
lappend ret_val ""
return $ret_val
The final empty string (item in list) is necessary to
point to the end of list. The `code', `matched', and
`info' values are not necessary, and default values are
given if not specified. The `code' value is usually an
LDAP error in decimal notation from ldap.h. The `info',
may be sent back to the client, depending on the function.
In the bind proc, LDAP uses the value of `code' to indi-
cate whether or not the authentication is acceptable.
The other type of return is for searches. It is similar
format to the shell backend return (as is most of the syn-
tax here). Its format follows:
{dn: o=Company, c=US} {attr: val} {objectclass: val} {}
{dn: o=CompanyB, c=US} {attr: val} {objectclass: val} {}
Again, newlines are for visual purposes here. Also note
the {} marking the end of the entry (same effect as a new-
line in ldif format). Here is some example code again,
showing a full search proc example.
# Note that `args' lets you lump all possible args
# into one var, used here for simplicity of example
proc ldap:search { args } {
# ...perform some operations...
lappend ret_val "dn: $rdn,$base"
lappend ret_val "objectclass: $objcl"
lappend ret_val "sn: $rdn"
lappend ret_val "mail: $email"
lappend ret_val ""
# Now setup the result
lappend ret_val "RESULT"
lappend ret_val "code: 0"
lappend ret_val ""
return $ret_val
}
NOTE: Newlines in the return value is acceptable in search
entries (i.e. when returning base64 encoded binary
entries).
Builtin Commands and Variables
ldap:debug <msg>
Allows you to send debug messages through OpenL-
DAP's native debugging system, this is sent as a
LDAP_DEBUG_ANY and will be logged. Useful for
debugging scripts or logging bind failures.
FILES
ETCDIR/slapd.conf
default slapd configuration file
SEE ALSOslapd.conf(5), slapd(8), Tcl(3tcl).
OpenLDAP LDVERSION RELEASEDATE SLAPD-TCL(5)
