Binary Data in LDIF

You can represent binary data in LDIF by using one of the following methods:

• Standard LDIF notation, the lesser than, <, symbol

• Command-line utility, ldapmodify with the -b option

• Base 64 encoding

Representing Binary Data by Using Standard LDIF Notation

The following example gives the standard LDIF notation of binary data:

jpegphoto:< file:/path/to/photo

In the example, the path is relative to the client, not to the server. To use standard notation, you do not need to specify the ldapmodify -b parameter. However, you must add the following line to the beginning of your LDIF file or to your LDIF update statements:

version:1

For example, you could use the ldapmodify command, as follows:

$ ldapmodify -D userDN -w passwd
version: 1
dn: cn=Barbara Jensen,ou=People,dc=example,dc=com
changetype: modify
add: userCertificate
userCertificate;binary:< file:BabsCert

Representing Binary Data by Using the ldapmodify -b Command

For backward compatibility with earlier versions of Directory Server, binary data can be represented by using the ldapmodify -b command. However, when possible, use the standard LDIF notation to represent binary data.

Directory Server accepts the ldapmodify command with the -b parameter and the following LDIF notation:

jpegphoto: /path/to/photo

This notation indicates that the ldapmodify command should read the referenced file for binary values if the attribute value begins with a slash.

Representing Binary Data by Using Base 64 Encoding

Base 64 encoded data is represented by the :: symbol, as shown in this example:

jpegPhoto:: encoded_data

In addition to binary data, the following values must be base 64 encoded:

• Any value that begins with a semicolon, ;, or a space

• Any value that contains non ASCII data, including new lines

Use the ldif command with the -b parameter to convert binary data to LDIF format, as follows.

$ ldif -b attributeName

For more information about how to use the ldif command, see the ldif(1) man page.

In the above example, attributeName is the name of the attribute to which you are supplying the binary data. The binary data is read from standard input and the results are written to standard output. Use redirection operators to select input and output files.

The command takes any input and formats it with the correct line continuation and appropriate attribute information. The command also assesses whether the input requires base–64 encoding. The following example takes a binary file containing a JPEG image and converts it into LDIF format for the attribute named jpegPhoto. The output is saved to out.ldif:

$ ldif -b jpegPhoto < aphoto.jpg > out.ldif

The -b option specifies that the utility should interpret the entire input as a single binary value. If the -b option is not present, each line is considered as a separate input value.

You can edit the output file to add the LDIF statements required to create or modify the directory entry that will contain the binary value. For example, you can open the file out.ldif in a text editor and add the following lines at the top of the file.

dn: cn=Barbara Jensen,ou=People,dc=example,dc=com
changetype: modify
add: jpegPhoto
jpegPhoto:: encoded_data

In this example, encoded_data represents the contents of the out.ldif file produced by the command.