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<b>CDDB-protocol documentation</b><br>
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<pre>
CDDB Protocol
By Steve Scherf and Ti Kan
--------------------------
Revision: $Id: CDDBPROTO,v 1.6 1997/05/14 07:53:52 steve Exp steve $
Notation:
-> : client to server
<- : server to client
terminating marker: `.' character in the beginning of a line
Server response code (three digit code):
First digit:
1xx Informative message
2xx Command OK
3xx Command OK so far, continue
4xx Command OK, but cannot be performed for some specified reasons
5xx Command unimplemented, incorrect, or program error
Second digit:
x0x Ready for further commands
x1x More server-to-client output follows (until terminating marker)
x2x More client-to-server input follows (until terminating marker)
x3x Connection will close
Third digit:
xx[0-9] Command-specific code
CDDB Protocol Level 1:
----------------------
Server sign-on banner:
----------------------
<- code hostname CDDBP server version ready at date
code:
200 OK, read/write allowed
201 OK, read only
432 No connections allowed: permission denied
433 No connections allowed: X users allowed, Y currently active
434 No connections allowed: system load too high
hostname:
Server host name. Example: xyz.fubar.com
version:
Version number of server software. Example: v1.0PL0
date:
Current date and time. Example: Wed Mar 13 00:41:34 1996
Initial client-server handshake:
--------------------------------
Note: This handshake must occur before other cddb commands
are accepted by the server.
Client command:
-> cddb hello username hostname clientname version
username:
Login name of user. Example: johndoe
hostname:
Host name of client. Example: abc.fubar.com
clientname:
The name of the connecting client. Example: xmcd, cda, EasyCD,
et cetera. Do not use the name of another client which already
exists.
version:
Version number of client software. Example: v1.0PL0
Server response:
<- code hello and welcome username@hostname running clientname version
code:
200 Handshake successful
431 Handshake not successful, closing connection
402 Already shook hands
CDDB query:
-----------
Client command:
-> cddb query discid ntrks off1 off2 ... nsecs
discid:
CD disc ID number. Example: f50a3b13
ntrks:
Total number of tracks on CD.
off1, off2, ...:
Frame offset of the starting location of each track.
nsecs:
Total playing length of CD in seconds.
Server response:
<- code categ discid dtitle
or
<- code close matches found
<- categ discid dtitle
<- categ discid dtitle
<- (more matches...)
<- .
code:
200 Found exact match
211 Found inexact matches, list follows (until terminating marker)
202 No match found
403 Database entry is corrupt
409 No handshake
categ:
CD category. Example: rock
discid:
CD disc ID number of the found entry. Example: f50a3b13
dtitle:
The Disc Artist and Disc Title (The DTITLE line). For example:
Pink Floyd / The Dark Side of the Moon
CDDB read:
----------
Client command:
-> cddb read categ discid
categ:
CD category. Example: rock
discid:
CD disc ID number. Example: f50a3b13
Server response:
<- code categ discid
<- # xmcd 2.0 CD database file
<- # ...
<- (CDDB data...)
<- .
or
<- code categ discid No such CD entry in database
code:
210 OK, CDDB database entry follows (until terminating marker)
401 Specified CDDB entry not found.
402 Server error.
403 Database entry is corrupt.
409 No handshake.
categ:
CD category. Example: rock
discid:
CD disc ID number. Example: f50a3b13
CDDB search: (command not yet implemented in freedb-serversoftware!)
------------
Client command:
-> cddb srch key search_type ... search_type
key:
Pseudo-regular expression to match. Expressions should meet the
following description:
- No white space.
- Printable characters only.
- Case is ignored.
search_type:
CDDB fields to search through. Example: title
Supported types: artist, title, extd, ext, trk
categ:
CD category. Example: rock
Server response:
<- code matches found
<- categ discid dtitle
<- categ discid dtitle
<- (more matches...)
<- .
code:
210 OK, matches found, list follows (until terminating marker)
401 No match found.
409 No handshake.
categ:
CD category. Example: rock
dtitle:
The Disc Artist and Disc Title (The DTITLE line). For example:
Pink Floyd / The Dark Side of the Moon
CDDB write:
-----------
Client command:
-> cddb write categ discid
categ:
CD category. Example: rock
discid:
CD disc ID number. Example: f50a3b13
Server response:
<- code categ discid
code:
320 OK, input CDDB data (until terminating marker)
401 Permission denied.
402 Server file system full/file access failed.
409 No handshake.
501 Entry rejected: reason for rejection.
categ:
CD category. Example: rock
discid:
CD disc ID number. Example: f50a3b13
Client data:
-> # xmcd 2.0 CD database file
-> # ...
-> (CDDB data)
-> .
Server response:
<- code message
code:
200 CDDB entry accepted
401 CDDB entry rejected: reason why
message:
Message string to indicate write status:
CDDB entry accepted, or CDDB entry rejected.
Help information:
-----------------
Client command:
-> help
or
-> help cmd
cmd:
CDDB command. Example: quit
or
-> help cmd subcmd
cmd:
CDDB command. Example: cddb
subcmd:
CDDB command argument. Example: query
Server response:
<- code Help information follows
<- (help data ...)
<- .
or
<- code no help information available
code:
210 OK, help information follows (until terminating marker)
401 No help information available
Log statistics:
---------------
Client command:
-> log [[-l lines] [start date [end date]] | [day [days]] | [get"]]
lines:
The maximum number of lines to print for each data list in the
log statistics.
start date:
The date after which statistics should be calculated. Date is
of the format: hh[mm[ss[MM[DD[[CC]YY]]]]]
E.g.: 201200053196 for 8:12 PM on May 31, 1996.
20120005312096 for 8:12 PM on May 31, 2096.
080530 for today at at 8:15 and 30 seconds.
If the century ("CC") is omitted, a reasonable guess is made. If
this argument is omitted, all messages are considered.
end date:
The date after which statistics should not be calculated. If
omitted, the end date is assumed to be the current date.
day:
The string "day". This solitary argument will cause a log search
of messages generated within the last day.
days:
A positive numerical argument which modifies the number of days'
messages to searh. If this argument is left out, the default is 1.
get:
The string "get". This solitary argument will cause the server
to send the contents of the log file.
Server response:
<- code Log summary follows
<- (log stats)
<- .
or
<- code Log follows
<- (log stats)
<- .
code:
210 OK, log summary follows (until terminating marker)
211 OK, log follows (until terminating marker)
401 Permission denied
402 No log information available
501 Invalid start/end date
Message of the day:
------------------
Client command:
-> motd
Server response:
<- code Last modified: date MOTD follows (until terminating marker)
<- (message text)
<- .
code:
210 Last modified: 05/31/96 06:31:14 MOTD follows (until terminating marker)
401 No message of the day available
date:
The date the text of the message of the day was modified. The date
appears in the following format:
05/31/96 06:31:14
This value may be used by client software as a message timestamp
for purposes of determining if it has already been displayed. This
format was chosen because it is more easily parsed than the standard
ctime() format.
Server protocol level:
----------------------
Client command:
-> proto [level]
level:
The (numerical) protocol level to set the server to.
Server response:
<- code CDDB protocol level: current cur_level, supported supported_level
or
<- code OK, protocol version now: cur_level
code:
200 CDDB protocol level: current cur_level, supported supp_level
201 OK, protocol version now: cur_level
501 Illegal protocol level.
502 Protocol level already cur_level.
cur_level:
The current protocol level at which the server is running.
supported_level:
The maximum supported protocol level.
Server sites:
--------------
Client command:
-> sites
Server response:
<- code OK, site information follows (until terminating `.')
<- (data)
<- .
code:
210 Ok, site information follows
401 No site information available.
The data format is as follows:
site port latitude longitude description
The fields are as follows:
site:
The Internet address of the remote site.
port:
The port at which the server resides on that site.
latitude:
The latitude of the server site. The format is as follows:
CDDD.MM
Where "C" is the compass direction (N, S), "DDD" is the
degrees, and "MM" is the minutes.
longitude:
The longitude of the server site. Format is as above, except
the compass direction must be one of (E, W).
description:
A short description of the geographical location of the site.
Example:
cddb.moonsoft.com 888 N037.23 W122.01 Fremont, CA USA
Server status:
--------------
Client command:
-> stat
Server response:
<- code OK, status information follows (until terminating `.')
<- (data)
<- .
code:
210 Ok, status information follows
The possible data is as follows:
current proto: <current_level>
An integer representing the server's current operating protocol
level.
max proto: <max_level>
The maximum supported protocol level.
gets: <yes | no>
Whether or not the client is allowed to get log information,
according to the string "yes" or "no".
updates: <yes | no>
Whether or not the client is allowed to initiate a database
update, according to the string "yes" or "no".
posting: <yes | no>
Whether or not the client is allowed to post new entries,
according to the string "yes" or "no".
quotes: <yes | no>
Whether or not quoted arguments are enabled, according to
the string "yes" or "no".
current users: <num_users>
The number of users currently connected to the server.
max users: <num_max_users>
The number of users that can concurrently connect to the server.
strip ext: <yes | no>
Whether or not extended data is stripped by the server before
presented to the user.
Database entries: <num_db_entries>
The total number of entries in the database.
Database entries by category:
This field is followed by a list of catgories and the number
of entries in that category. Each entry is of the following
format:
<white space>catgory: <num_db_entries>
The list of entries is terminated by the first line that does
not begin with white space.
Pending file transmissions:
This field is followed by a list of sites that are fed new
database entries at periodic intervals, and the number of
entries that have yet to be transmitted to that site.
Each entry is of the following format:
<white space>site: <num_db_entries>
The list of entries is terminated by the first line that does
not begin with white space.
This list may grow as needed, so clients must expect possible
unrecognizable data. Also, additional fields may be added to
the currently existing lines, although no existing fields will
be removed or change position.
Server version:
---------------
Client command:
-> ver
Server response:
<- code servername version copyright
or
<- code Version information follows
code:
200 Version information.
211 OK, version information follows (until terminating marker)
version:
Server version. Example: v1.0PL0
copyright:
Copyright string. Example: Copyright (c) 1996 Steve Scherf
Database update:
----------------
Client command:
-> update
Server response:
<- code Updating the database.
or
<- code Permission denied.
or
<- code Unable to update the database.
code:
200 Updating the database.
401 Permission denied.
402 Unable to update the database.
Server users:
-------------
Client command:
-> whom
Server response:
<- code User list follows
code:
210 OK, user list follows (until terminating marker)
401 No user information available.
Client sign-off:
----------------
Client command:
-> quit
Server response:
<- code hostname closing connection. Goodbye.
code:
230 OK, goodbye.
hostname:
Server host name. Example: xyz.fubar.com
General errors:
---------------
Server response:
<- code error
code:
402 Server error.
408 CGI environment error.
500 Command syntax error, command unknown, command unimplemented.
530 Server error, server timeout.
Reserved errors:
----------------
The following error codes are reserved, and will never be returned as a
response to a CDDB protocol command. They are intended to be used internally
by clients that have a need for generating pseudo-responses.
600-699
CDDB Protocol Level 2:
----------------------
In all respects, protocol level 2 is the same as level 1, with the exceptions
listed below.
Arguments to commands may be surrounded by double quotes. All characters
within the quotes, including white space, are included in the argument. All
white space is replaced by the `_' (2Dh) character by the server. White space
is defined as ` ' (20h) and `^I' (control-I, or 09h).
Arguments containing quotes that should not be interpreted with the special
meaning described above should be escaped with a preceding backslash character,
or '' (5Ch). If an actual backslash appears in an argument, it should be
escaped with a preceding backslash. In both cases, the preceding backslash
will be removed from the input before being interpreted.
CDDB Protocol Level 3:
----------------------
Protocol level 3 is the same as level 2, with the exception listed below.
The output of the "sites" command has changed to meet the folowing description:
The data format is as follows:
site protocol port address latitude longitude description
The fields are as follows:
site:
The Internet address of the remote site.
protocol:
The transfer protocol used to access the site.
port:
The port at which the server resides on that site.
address:
Any additional addressing information needed to access the
server. For example, for HTTP protocol servers, this would be
the path to the CDDB server CGI script. This field will be
"-" if no additional addressing information is needed.
latitude:
The latitude of the server site. The format is as follows:
CDDD.MM
Where "C" is the compass direction (N, S), "DDD" is the
degrees, and "MM" is the minutes.
longitude:
The longitude of the server site. Format is as above, except
the compass direction must be one of (E, W).
description:
A short description of the geographical location of the site.
Example:
cddb.moonsoft.com cddbp 888 - N037.23 W122.01 Fremont, CA USA
cddb.moonsoft.com http 80 /~cddb/cddb.cgi N037.23 W122.01 Fremont,CA USA
Note that a site may appear once for each type of protocol it supports for
accessing the server.
Addendum A: Proper use of CDDBP:
--------------------------------
There are a few guidelines that must be followed in order to make proper use
of CDDBP:
- When handshaking with the server via the "cddb hello" command, the client
must specify its own name and version, not that of some other client (such
as xmcd). Also, the "username" and "hostname" must be that of the actual
user running the program, not some hardwired value.
- Before performing a "cddb read", the client program MUST perform a
"cddb query". Failure to do so may result in the client program receiving
incorrect CDDB data from the server. Also, without performing a query, the
client program will not benefit from close matches in the event of the
lack of an exact match in the database.
- For accounting purposes, it is best if client programs only perform a single
"cddb query" for a particular disc before performing a "cddb read" for that
disc.
Addendum B: CDDBP under HTTP:
-----------------------------
Accessing a server as a CGI script is done in much the same way as through
direct interaction. The command set is identical, though the method of
communication is through CDDBP commands encapsulated in the HTTP protocol.
The only limitation is that a single command may be executed per connection,
since HTTP is not truly interactive. For the server to be accessed in this
way, it must reside on the target host at a known URL which is accessible by
the host HTTP server. The client program must connect to the HTTP server on
the target host and issue an HTTP command with the appropriate CDDBP command
encapsulated within.
Commands may be submitted to servers in CGI mode using either the "GET" or
"POST" HTTP commands. Both methods are supported, and there is no real
difference between how both are to be used other than the syntactical
difference between the two methods. The "POST" method may provide the ability
to issue longer commands, though, depending on the architecture of the system
on which the server resides.
The server command must be sent as part of the "Request-URI" in the case
of the "GET" method, and as the "Entity-Body" in the case of the "POST"
method. In both cases, the command must be of the following form:
cmd=server+command&hello=joe+my.host.com+clientname+version&proto=1
Where the text following the "cmd=" represents the CDDBP command to be
executed, the text following the "hello=" represents the arguments to
the "cddb hello" command that is implied by this operation, and the
text following the "proto=" represents the argument to the "proto" command
that is implied by this operation.
The "+" characters in the input represent spaces, and will be translated
by the server before performing the request. Special characters may be
represented by the sequence "%XX" where "XX" is a two-digit hex number
corresponding to the ASCII (ISO-8859-1) sequence of that character. The
"&" characters denote separations between the command, hello and proto
arguments. Newlines and carriage returns must not appear anywhere in the
string except at the end.
All CDDBP commands are supported under HTTP, except for "cddb hello",
"cddb write", "proto" and "quit".
For example, should user "joe" on system "my.host.com" be running xmcd 2.1,
a read request for his currenly playing CD might look like this:
cmd=cddb+read+rock+12345678&hello=joe+my.host.com+xmcd+2.1&proto=1
The server will perform the implied "proto" and "cddb hello" commands,
and then perform the requested "cddb read" command.
Server response to the command is encapsulated in the HTTP server response,
and appears in the "Entity-Body" exactly as it would appear using the CDDBP
protocol. Note that the HTTP response "Entity-Header" is not guaranteed to
contain a "Content-Length" field, so clients should be prepared to accept
variable length input. This is no different from operation under CDDBP. The
header will always contain a Mime "Content-Type" field which describes the
body of data as "text/plain".
For more detailed information on HTTP and Mime, see RFC 1945 and RFC 1521.
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