Ubuntu Manpage: gnatsd - GNATS network server

NAME

       gnatsd - GNATS network server

SYNOPSIS

       gnatsd [--database database | -d database] [--not-inetd | -n] [--max-access-level level | -m level]
              [--version | -V] [--help | -h]

DESCRIPTION

       gnatsd is used to service remote GNATS requests such as querying PRs, PR creation, deletion, and editing,
       and  miscellaneous  database  queries.  It uses a simple ASCII-based command protocol (similar to SMTP or
       POP3) for communicating with remote clients.

       It also provides a security model based either on IP-based authentication (generally a terrible idea)  or
       username/passwords.   Passwords  may  be  encrypted using UNIX crypt() or MD5 (for operating systems that
       support it).  Plaintext passwords are also supported but strongly discouraged.

       All of the GNATS clients are capable of communicating via the GNATS  remote  protocol  to  perform  their
       functions.

       gnatsd should be run by the GNATS user (by default gnats), and it is usually started from inetd(8).

OPTIONS

       -V, --version
            Prints the program version to stdout and exits.

       -h, --help
            Prints a short help text to stdout and exits.

       -d, --database
            Specifies  the default database which is to be serviced by this invocation of gnatsd.  (The selected
            database may be changed via the CHDB command; this is simply the  default  if  no  CHDB  command  is
            issued.)  If no database is specified, the database named default is assumed.  This option overrides
            the database specified in the GNATSDB environment variable.

       --not-inetd, -n
            As its name suggests, indicates that gnatsd is not being invoked from inetd.  This can be used  when
            testing gnatsd, or if it being run via ssh or some other mechanism.

            This  has  the  effect  of using the local hostname where gnatsd is being invoked for authentication
            purposes, rather than the remote address of the connecting client.

       --max-access-level, -m
            Specifies the maximum access level that the connecting client can authenticate to. Authentication is
            as  normal  but  if  the  user  or host authenticates at a higher level, access level is set to this
            level.

COMMAND PROTOCOL

Commands are issued to gnatsd as one or more words followed by a carriage-return/linefeed pair. For
example, the CHDB (change databases) command is sent as
CHDB database<CR><LF>
[the CRLF will not be explicitly written for future examples]

Replies from gnatsd are returned as one or more response lines containing a 3-digit numeric code followed
by a human-readable string; the line is terminated with a <CR><LF> pair. For example, one possible
response to the CHDB command above would be:
210 Now accessing GNATS database 'database'.

The three-digit code is normally followed by a single ASCII space (character 0x20). However, if
additional response lines are to be returned from the server, there will be a single dash (`-') instead
of the space character after the three-digit code.

Response code values are divided into ranges. The first digit reflects the general type of response
(such as "successful" or "error"), and the subsequent digits identify the specific type of response.

Codes 200-299
Positive response indicating that the command was successful. No subsequent data will be
transmitted with the response. [In particular, code 210 (CODE_OK) is used as the positive result
code for most simple commands.]

Commands that expect additional data from the client (such as SUBM or VFLD) use a two-step
mechanism for sending the data. The server will respond to the initial command with either a 211
(CODE_SEND_PR) or 212 (CODE_SEND_TEXT) response line, or an error code if an error occurred with
the initial command. The client is then expected to send the remaining data using the same
quoting mechanism as described for server responses in the 300-349 range. The server will then
send a final response line to the command.

Codes 300-399
Positive response indicating that the query request was successful, and that a PR or other data
will follow. Codes 300-349 are used when transmitting PRs, and 350-399 are used for other
responses.

Codes in the 300-349 range are followed by a series of CRLF-terminated lines containing the
command response, usually a PR. The final line of the result is a single period (`.'). Result
lines that begin with a period have an extra period prepended to them.

Codes in the 350-399 range use a different scheme for sending their responses. The three-digit
numeric code will be followed by either a dash (`-') or a single space. If the code is followed
by a dash, that indicates that another response line will follow. The final line of the response
has a single space after the three-digit code.

In previous versions of the protocol the first line of a CODE_INFORMATION (310) response was to be
ignored. This is no longer the case. Instead, any lines marked with code CODE_INFORMATION_FILLER
(351) are to be ignored. This allows the server to transmit additional headers or other human-
readable text that can be safely ignored by the clients.

Codes 400-599
An error occurred, usually because of invalid command parameters or invalid input from the client,
missing arguments to the comamand, or a command was issued out of sequence. The human-readable
message associated with the response line describes the general problem encountered with the
command.

Multiple error messages may be returned from a command; in this case the `-' continuation
character is used on all but the last response line.

Codes 600-799
An internal error occurred on the server, a timeout occurred reading data from the client, or a
network failure occurred. These errors are of the "this should not occur" nature, and retrying
the operation may resolve the problem. Fortunately, most GNATS transactions are idempotent;
unfortunately, locking the database or a PR are not repeatable actions (we cannot determine if an
existing lock is the one we originally requested, or someone else's).

COMMANDS

Note that the set of GNATS commands and their responses is somewhat inconsistent and is very much in
flux. At present the GNATS clients are rather simple-minded and not very strict about processing
responses. For example, if the server were to issue a code 300 (CODE_PR_READY) response to a CHDB
command, the client would happily expect to see a PR appear (and would print it out if one was sent).

It is thus suggested that any clients that use the GNATS protocol be equally flexible about the way
received responses are handled; in particular, only the first digit of the response code should be
assumed to be meaningful, although subsequent digits are needed in some cases (codes 300-399). No attempt
should be made to parse the message strings on error response lines; they are only intended to be read by
humans, and will be changed on a regular basis.

Almost every command may result in the response 440 (CODE_CMD_ERROR). This indicates that there was a
problem with the command arguments, usually because of insufficient or too many arguments being
specified.

USER [<userid> [<password>]]
Specifies the userid and password for database access. Both a username and a password may be given,
only a username may be given, or both may be omitted; if both are omitted, the current access level
is returned.

The possible server responses are:

350 (CODE_INFORMATION)
The current access level is specified.

422 (CODE_NO_ACCESS)
A matching username and password could not be found.

200 (CODE_OK)
A matching username and password was found, and the login was successful.

QUIT Requests that the connection be closed. Possible responses:

201 (CODE_CLOSING)
Normal exit.

The quit command has the dubious distinction of being the only command that cannot fail.

LIST <list type>
Describes various aspects of the database. The lists are returned as a list of records, one per
line. Each line may contain a number of colon-separated fields.

Possible values for list type include

Categories
Describes the legal categories for the database.

Submitters
Describes the set of submitters for the database.

Responsible
Lists the names in the responsible administrative file, including their full names and
email addresses.

States Lists the states listed in the state administrative file, including the state type (usually
blank for most states; the closed state has a special type).

FieldNames
Lists the entire set of PR fields.

InitialInputFields
Lists the fields that should be present when a PR is initially entered.

InitialRequiredFields
Lists fields that have to be present and nonempty when a PR is initially entered (fields
containing only blank characters such as spaces or newlines are considered empty.)

Databases
Lists the set of databases.

The possible responses are:

301 (CODE_TEXT_READY)
Normal response, followed by the records making up the list as described above.

416 (CODE_INVALID_LIST)
The requested list does not exist.

FTYP <field> [<field> ...]
Describes the type of data held in the field(s) specified with the command. The currently-defined
data types are:

Text A plain text field, containing exactly one line.

MultiText
A text field possibly containing multiple lines of text.

Enum An enumerated data field; the value is restricted to one entry out of a list of values
associated with the field.

MultiEnum
The field contains one or more enumerated values. Values are separated with spaces or colons
(:).

Integer
The field contains an integer value, possibly signed.

Date The field contains a date.

TextWithRegex
The value in the field must match one or more regular expressions associated with the field.

The possible responses are:

350 (CODE_INFORMATION)
The normal response; the supplied text is the data type.

410 (CODE_INVALID_FIELD_NAME)
The specified field does not exist.

If multiple field names were given, multiple response lines will be sent, one for each field, using
the standard continuation protocol; each response except the last will have a dash (`-') immediately
after the response code.

FTYPINFO <field> <property>
Provides field-type-related information. Currently, only the property `separators' for MultiEnum
fields is supported. When `separators' is specified, the possible return codes are:

350 (CODE_INFORMATION)
A proper MultiEnum field was specified and the returned text is the string of separators
specified for the field in the dbconfig file, quoted within ''.

435 (CODE_INVALID_FTYPE_PROPERTY)
The `separators' property is not defined for this field, i.e. the specified field is not of
type MultiEnum.

Currently, specifying a different property than `separators' results in return code 435 as above.

FDSC <field> [<field> ... ]
Returns a human-readable description of the listed field(s). The possible responses are:

350 (CODE_INFORMATION)
The normal response; the supplied text is the field description.

410 (CODE_INVALID_FIELD_NAME)
The specified field does not exist.

Like the FVLD command, the standard continuation protocol will be used if multiple fields were
specified with the command.

FIELDFLAGS <field> [<field> ... ]
Returns a set of flags describing the specified field(s). The possible responses are either
410 (CODE_INVALID_FIELD_NAME), meaning that the specified field is invalid or nonexistent, or
350 (CODE_INFORMATION) which contains the set of flags for the field. The flags may be blank, which
indicate that no special flags have been set for this field.

Like the FDSC and FTYP commands, multiple field names may be listed with the command, and a response
line will be returned for each one in the order that the fields appear on the command line.

The flags include:

textsearch
The field will be searched when a text field search is requested.

allowAnyValue
For fields that contain enumerated values, any legal value may be used in the field, not just
ones that appear in the enumerated list.

requireChangeReason
If the field is edited, a reason for the change must be supplied in the new PR text
describing the reason for the change. The reason must be supplied as a multitext PR field in
the new PR whose name is field-Changed-Why (where field is the name of the field being
edited).

readonly
The field is read-only, and cannot be edited.

FVLD <field>
Returns one or more regular expressions or strings that describe the valid types of data that can be
placed in field. Exactly what is returned is dependent on the type of data that can be stored in
the field. For most fields a regular expression is returned; for enumerated fields, the returned
values are the list of legal strings that can be held in the field.

The possible responses are:

301 (CODE_TEXT_READY)
The normal response, which is followed by the list of regexps or strings.

410 (CODE_INVALID_FIELD_NAME)
The specified field does not exist.

VFLD <field>
VFLD can be used to validate a given value for a field in the database. The client issues the VFLD
command with the name of the field to validate as an argument. The server will either respond with
212 (CODE_SEND_TEXT), or 410 (CODE_INVALID_FIELD_NAME) if the specified field does not exist.

Once the 212 response is received from the server, the client should then send the line(s) of text
to be validated, using the normal quoting mechanism described for PRs. The final line of text is
followed by a line containing a single period, again as when sending PR text.

The server will then either respond with 210 (CODE_OK), indicating that the text is acceptable, or
one or more error codes describing the problems with the field contents.

INPUTDEFAULT <field> [<field> ... ]
Returns the suggested default value for a field when a PR is initially created. The possible
responses are either 410(CODE_INVALID_FIELD_NAME), meaning that the specified field is invalid or
nonexistent, or 350 (CODE_INFORMATION) which contains the default value for the field.

Like the FDSC and FTYP commands, multiple field names may be listed with the command, and a response
line will be returned for each one in the order that the fields appear on the command line.

RSET Used to reset the internal server state. The current query expression is cleared, and the index of
PRs may be reread if it has been updated since the start of the session.
The possible responses are:

200 (CODE_OK)
The state has been reset.

440 (CODE_CMD_ERROR)
One or more arguments were supplied to the command.

6xx (internal error)
There were problems resetting the state (usually because the index could not be reread). The
session will be immediately terminated.

LKDB Locks the main GNATS database. No subsequent database locks will succeed until the lock is removed.
Sessions that attempt to write to the database will fail.
The possible responses are:

200 (CODE_OK)
The lock has been established.

440 (CODE_CMD_ERROR)
One or more arguments were supplied to the command.

431 (CODE_GNATS_LOCKED)
The database is already locked, and the lock could not be obtained after 10 seconds.

6xx (internal error)
An internal error occurred, usually because of permission or other filesystem-related
problems. The lock may or may not have been established.

UNDB Unlocks the database. Any session may steal a database lock; no checking of any sort is done.
The possible responses are:

200 (CODE_OK)
The lock has been removed.

432 (CODE_GNATS_NOT_LOCKED)
The database was not locked.

440 (CODE_CMD_ERROR)
One or more arguments were supplied to the command.

6xx (internal error)
The database lock could not be removed, usually because of permissions or other filesystem-
related issues.

LOCK <PR> <user> [<pid>]
Locks the specified PR, marking the lock with the name user and the optional pid. (No checking is
done that the user or pid arguments are valid or meaningful; they are simply treated as strings.)

The EDIT command requires that the PR be locked before it may be successfully executed. However, it
does not require that the lock is owned by the editing session, so the usefulness of the lock is
simply as an advisory measure.

The APPN and REPL commands lock the PR as part of the editing process, and they do not require that
the PR be locked before they are invoked.

The possible responses are:

440 (CODE_CMD_ERROR)
Insufficient or too many arguments were specified to the command.

300 (CODE_PR_READY)
The lock was successfully obtained; the text of the PR (using the standard quoting mechanism
for PRs) follows.

400 (CODE_NONEXISTENT_PR)
The PR specified does not exist.

430 (CODE_LOCKED_PR)
The PR is already locked by another session.

6xx (internal error)
The PR lock could not be created, usually because of permissions or other filesystem-related
issues.

UNLK <PR>
Unlocks PR. Any user may unlock a PR, as no checking is done to determine if the requesting session
owns the lock.

The possible responses are:

440 (CODE_CMD_ERROR)
Insufficient or too many arguments were specified to the command.

200 (CODE_OK)
The PR was successfully unlocked.

433 (CODE_PR_NOT_LOCKED)
The PR was not locked.

6xx (internal error)
The PR could not be unlocked, usually because of permission or other filesystem-related
problems.

DELETE <PR>
Deletes the specified PR. The user making the request must have admin privileges. If successful,
the PR is removed from the filesystem and the index file; a gap will be left in the numbering
sequence for PRs. No checks are made that the PR is closed.

The possible responses are:

200 (CODE_OK)
The PR was successfully deleted.

422 (CODE_NO_ACCESS)
The user requesting the delete does not have admin privileges.

430 (CODE_LOCKED_PR)
The PR is locked by another session.

431 (CODE_GNATS_LOCKED)
The database has been locked, and no PRs may be updated until the lock is cleared.

6xx (internal error)
The PR could not be successfully deleted, usually because of permission or other filesystem-
related problems.

CHEK [initial]
Used to check the text of an entire PR for errors. Unlike the VFLD command, it accepts an entire PR
at once instead of the contents of an individual field.

The initial argument indicates that the PR text to be checked is for a PR that will be newly
created, rather than an edit or replacement of an existing PR.

After the CHEK command is issued, the server will respond with either a 440 (CODE_CMD_ERROR)
response indicating that the command arguments were incorrect, or a 211 (CODE_SEND_PR) response code
will be sent.

Once the 211 response is received from the server, the client should send the PR using the normal PR
quoting mechanism; the final line of the PR is then followed by a line containing a single period,
as usual.

The server will then respond with either a 200 (CODE_OK) response, indicating there were no problems
with the supplied text, or one or more error codes listing the problems with the PR.

EDIT <PR>
Verifies the replacement text for PR. If the command is successful, the contents of PR are
completely replaced with the supplied text. PR must previously have been locked with the LOCK
command.

The possible responses are:

431 (CODE_GNATS_LOCKED)
The database has been locked, and no PRs may be updated until the lock is cleared.

433 (CODE_PR_NOT_LOCKED)
The PR was not previously locked with the LOCK command.

400 (CODE_NONEXISTENT_PR)
The specified PR does not currently exist. The SUBM command should be used to create new
PRs.

211 (CODE_SEND_PR)
The client should now transmit the replacement PR text using the normal PR quoting mechanism.
After the PR has been sent, the server will respond with either a 200 (CODE_OK) response
indicating the edit was successful, or one or more error codes listing problems with either
with the replacement PR text, or errors encountered while updating the PR file or index.

APPN <PR> <field>

REPL <PR> <field>
Appends to or replaces the contents of field in PR with the supplied text. The command returns a
201 (CODE_SEND_TEXT) response; the client should then transmit the new field contents using the
standard PR quoting mechanism. After the server has read the new contents, it then attempts to make
the requested change to the PR.

The possible responses are:

200 (CODE_OK)
The PR field was successfully changed.

400 (CODE_NONEXISTENT_PR)
The PR specified does not exist.

410 (CODE_INVALID_FIELD_NAME)
The specified field does not exist.

402 (CODE_UNREADABLE_PR)
The PR could not be read.

431 (CODE_GNATS_LOCKED)
The database has been locked, and no PRs may be updated until the lock is cleared.

430 (CODE_LOCKED_PR)
The PR is locked, and may not be altered until the lock is cleared.

413 (CODE_INVALID_FIELD_CONTENTS)
The supplied (or resulting) field contents are not valid for the field.

6xx (internal error)
An internal error occurred, usually because of permission or other filesystem-related
problems. The PR may or may not have been altered.

SUBM Submits a new PR into the database. The supplied text is verified for correctness, and if no
problems are found a new PR is created.

The possible responses are:

431 (CODE_GNATS_LOCKED)
The database has been locked, and no PRs may be submitted until the lock is cleared.

211 (CODE_SEND_PR)
The client should now transmit the new PR text using the normal quoting mechanism. After the
PR has been sent, the server will respond with either a 200 (CODE_OK) response indicating
that the new PR has been created (and mail sent to the appropriate persons), or one or more
error codes listing problems with the new PR text.

CHDB <database> [<userid> [<password>]]
Switches the current database to the name specified in the command. An optional username or an
optional username and password may be given.

The possible responses are:

422 (CODE_NO_ACCESS)
The user does not have permission to access the requested database.

417 (CODE_INVALID_DATABASE)
The database specified does not exist, or one or more configuration errors in the database
were encountered.

210 (CODE_OK)
The current database is now database. Any operations performed will now be applied to that
database. The user access level for the new database is also returned.

DBLS Lists the known set of databases.

The possible responses are:

6xx (internal error)
An internal error was encountered while trying to obtain the list of available databases,
usually due to lack of permissions or other filesystem-related problems, or the list of
databases is empty.

301 (CODE_TEXT_READY)
The list of databases follows, one per line, using the standard quoting mechanism. Only the
database names are sent.

DBDESC <databasename>
Returns a human-readable description of the specified database. Responses include:

6xx (internal error)
An internal error was encountered while trying to read the list of available databases,
usually due to lack of permissions or other filesystem-related problems, or the list of
databases is empty.

350 (CODE_INFORMATION)
The normal response; the supplied text is the database description.

417 (CODE_INVALID_DATABASE)
The specified database name does not have an entry.

EXPR <query expression>
Specifies a query expression used to limit which PRs are returned from the QUER command. The
expression uses the normal query expression syntax, as described in the manual entry for query-
pr(1).

Multiple EXPR commands may be issued; the expressions are boolean ANDed together.

Expressions are cleared by the RSET command.

Possible responses include:

415 (CODE_INVALID_EXPR)
The specified expression is invalid, and could not be parsed.

200 (CODE_OK)
The expression has been accepted, and will be used to limit the results returned from QUER.

QFMT <query format>
Use the specified query format to format the output of the QUER command. The query format may be
either the name of a query format known to the server, or an actual query format.
The possible responses are:

200 (CODE_OK)
The normal response, which indicates that the query format is acceptable.

440 (CODE_CMD_ERROR)
No query format was supplied.

418 (CODE_INVALID_QUERY_FORMAT)
The specified query format does not exist, or could not be parsed.

QUER [PR] [PR] [...]
Searches the contents of the database for PRs that match the (optional) specified expressions with
the EXPR command. If no expressions were specified with EXPR, the entire set of PRs is returned.

If one or more PRs are specified on the commandline, only those PRs will be searched and/or output.

The format of the output from the command is determined by the query format selected with the QFMT
command.

The possible responses are:

418 (CODE_INVALID_QUERY_FORMAT)
A valid format was not specified with the QFMT command prior to invoking QUER.

300 (CODE_PR_READY)
One or more PRs will be output using the requested query format. The PR text is quoted using
the normal quoting mechanisms for PRs.

220 (CODE_NO_PRS_MATCHED)
No PRs met the specified criteria.

ADMV <field> <key> [<subfield>]
Returns an entry from an adm file associated with field. key is used to look up the entry in the
data file. If subfield is specified, only the value of that subfield is returned; otherwise, all of
the fields in the adm data file are returned, separated by colons (`:').

The responses are:

410 (CODE_INVALID_FIELD_NAME)
The specified field does not exist.

221 (CODE_NO_ADM_ENTRY)
An adm entry matching the key was not found, or the field does not have an adm file
associated with it.

350 (CODE_INFORMATION)
The normal response; the supplied text is the requested field(s).

ENVIRONMENT VARIABLES

       The GNATSDB environment variable is used to determine which database to use.  For a  local  database,  it
       contains  the  name  of  the database to access.  gnatsd cannot service remote databases (tho it might be
       interesting if it could) so the database is always assumed to be local.

       If GNATSDB is not set and the --database option is not supplied, it is assumed that the database is local
       and that its name is default.

COPYING

       Copyright (c) 2000, 2003 Free Software Foundation, Inc.

       Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice
       and this permission notice are preserved on all copies.

       Permission  is  granted  to copy and distribute modified versions of this manual under the conditions for
       verbatim copying, provided that the entire resulting derived work is distributed under  the  terms  of  a
       permission notice identical to this one.

       Permission is granted to copy and distribute translations of this manual into another language, under the
       above conditions  for  modified  versions,  except  that  this  permission  notice  may  be  included  in
       translations approved by the Free Software Foundation instead of in the original English.

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

COMMAND PROTOCOL

COMMANDS

ENVIRONMENT VARIABLES

SEE ALSO

COPYING