SLAPD-TCL(5) SLAPD-TCL(5)
NAME
slapd-tcl - Tcl backend to slapd
SYNOPSIS
/etc/openldap/slapd.conf
DESCRIPTION
The Tcl backend to slapd(8) works by embedding a Tcl(3tcl) interpreter into slapd(8). Any tcl data-base database
base 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
handles 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 data-bases. databases.
bases. 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 indicate
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 syntax 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 newline 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 OpenLDAP'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
/etc/openldap/slapd.conf
default slapd configuration file
SEE ALSO
slapd.conf(5), slapd(8), Tcl(3tcl).
OpenLDAP 2.3.27 2006/08/19 SLAPD-TCL(5)
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