CTLINND(8)

NAME
ctlinnd - Control the main InterNetNews daemon

SYNOPSIS
ctlinnd [-hs] [-t timeout] [command [argument ...]]

DESCRIPTION
ctlinnd sends a message to the control channel of innd(8), the main InterNetNews daemon.

In the normal mode of behavior, the message is sent to the server, which then performs the requested action and sends back a reply with a text message and an exit code for ctlinnd. If the server successfully performed the command, ctlinnd will print the reply on standard output and exit with a status of zero. If the server could not perform the command, it will direct ctlinnd to exit with a status of one. By default, ctlinnd will wait forever for a response from innd; this can be changed with the -t flag.

The "shutdown", "xabort", and "xexec" commands do not generate a reply, since they cause innd to exit. After these commands, ctlinnd will always exit silently with a status of zero.

OPTIONS

-h  Prints a command summary. If a command is given along with the -h flag, only the usage for that command will be given.

-s  If the command was successful, don't print the output from innd.

-t timeout
    Specifies how long to wait for the reply from the server, for commands other than "shutdown", "xabort", and "xexec". timeout is the number of seconds to wait. A value of zero says to wait forever, and a value less than zero says not to wait at all but just exit immediately with status zero. When waiting for a reply, ctlinnd will check every two minutes to be sure the server is still running, to make it less likely that ctlinnd will just hang.

    The default is zero, indicating that ctlinnd should wait forever.

COMMANDS
Here is the complete list of supported commands. Note that nearly all commands have a fixed number of arguments. If a parameter may be an empty string, it is still necessary to pass the empty string to ctlinnd as an argument (specified in the shell as two adjacent quotes, like '').

addhist message-id arrival expires posted token
    Add an entry to the history database for message-id. The angle brackets around the message-ID are optional. It should normally be protected from the shell with single quotes.

    arrival, expires, and posted should be the number of seconds since epoch and indicate when the article arrived, when it expires (via the Expires: header), and when it was posted (given in the Date: header), respectively. expires should be 0 if the article doesn't have an Expires: header. token is the storage API token for the article, and may be empty.

    This command can only be used while the server is running, and will be rejected if the server is paused or throttled.

allow reason
    Allow remote connections, reversing a prior "reject" command. reason must be the same text given to the "reject" command, or the empty string (which matches any reason).

begin site
    Begin feeding site. The server will rescan the newsfeeds file to find the specified site and set up a newsfeed for it. If the site already existed, a "drop" for that site is done first. This command is forwarded; see NOTES below.

cancel message-id
    Remove the article with the specified message-ID from the local system. This does not generate a cancel control message; it only affects the local system. The angle brackets around the message-ID are optional. It should normally be protected from the shell with single quotes (and not double quotes). For instance:

        ctlinnd cancel 'test@foo.bar'

    Note that the history database is updated with the specified message-ID so if an article with the same message-ID is afterwards received, it will be rejected; it is useful for rejecting spam before it arrives.

    If the server is throttled manually, this command causes it to briefly open the history database. If the server is paused or throttled for any other reason, this command is rejected.

changegroup group status
    The newsgroup group is changed so that its status (the fourth field in the active file) becomes status. This may be used to make an existing group moderated or unmoderated, for example.

    This command, unlike "newgroup" or "rmgroup", can only be used while the server is running, and will be rejected if the server is paused or throttled.

checkfile
    Check the syntax of the newsfeeds file and display a message if any errors are found. The details of the errors are reported to syslog.

drop site
    Flush and drop site from the server's list of active feeds. This command is forwarded; see NOTES below.

feedinfo site
    Print detailed information about the state of the feed to site, or brief status about all feeds if site is the empty string.

flush site
    Flush the buffer for the specified site. The action taken depends on the type of feed the site receives; see newsfeeds(5) for more information. This is useful when the site is being fed by a file and batching is about to start, or to cleanly shut down and respawn a channel feed. If site is an empty string, all sites are flushed and the active file and history database are also flushed to disk. This command is forwarded; see NOTES below.

    Flushing the innfeed channel feed is the recommended method of restarting innfeed to pick up new configuration. innd will spawn a new innfeed process while the old process shuts down cleanly.

flushlogs
    Close the news and error log files and rename them to add ".old" to the file name, then open fresh news and error logs. The active file and history database are also flushed to disk.

go reason
    Re-open the history database and start accepting articles again, reversing a previous "pause" or "throttle" command. reason must be either the empty string or match the text that was given to the earlier "pause" or "throttle" command.

    If a "reject" command is in effect, this will also reverse it by doing the equivalent of an "allow" command if the reason matches reason. Likewise, if a "reserve" command had been given, this will clear the reservation if reason matches the text that was given to "reserve".

    The history database is automatically closed on "throttle" or "pause" and reopened on "go", so the history database can be replaced during the pause or throttle without requiring an explicit "reload" command. If any other configuration files or the active file were modified, a "reload" command should be given to force the server to re-read those files.

    If the server throttled itself because it accumulated too many I/O errors, this command will reset the error count.

    If innd was not started with the -n y flag, this command also does the equivalent of a "readers" command with "yes" as the flag and reason as the text.

hangup channel
    Close the socket for the specified incoming channel. This may be useful when an incoming connection appears to be hung (although innd will close idle connections automatically after a timeout).

help [command]
    Print a command summary for all commands, or just command if one is specified. This is equivalent to the -h option.

kill signal site
    Signal signal is sent to the process underlying the specified site, which must be a channel or exploder feed. signal may be a numeric signal number or one of "hup", "int", or "term"; case is not significant.

logmode
    Cause the server to log its current operating mode to syslog.

lowmark file
    Reset the low water marks in the active file based on the contents of file. Each line in file must be of the form:

        group low-value

    For example:

        comp.lang.c++ 243

    This command is mostly used by news.daily to update the active file after nightly expiration.

mode
    Print the server's operating mode as a multi-line summary of the parameters and the operating state. The parameters in the output correspond to command-line flags to innd and give the current settings of those parameters that can be overridden by command-line flags.

name channel
    Print the name and relevant information for the given incoming or outgoing channel, or for all channels if channel is an empty string. The response is formatted as:

        <name>:<number>:<type>:<idle>:<status>

    where <name> is the name of the channel, <number> is its number (generally the same as the file descriptor assigned to it), <idle> is the idle time for an NNTP channel or the process ID for a process channel, and <status> is the status for NNTP channels.

    The type is one of the following values:

        control     Control channel for ctlinnd
        file        An outgoing file feed
        localconn   Local channel used by nnrpd and rnews for posting
        nntp        NNTP channel for remote connections
        proc        The process for a process feed
        remconn     The channel that accepts new remote connections

    Channel status indicates whether the channel is paused or not. Nothing is shown unless the channel is paused, in which case "paused" is shown. A channel will be paused automatically if the number of remote connections for that label in incoming.conf is greater than max-connections within hold-time seconds.

newgroup group [status [creator]]
    Create the specified newsgroup. The status parameter is the fourth field of the active file entry, as described in active(5). If it is not an equal sign, only the first character is used. creator should be the identity of the person creating the group. If the newsgroup already exists, this is equivalent to the "changegroup" command.

    creator, encoded in UTF-8 if given, may be omitted; if so, it will default to the newsmaster (as specified at configure time, normally "usenet"). status may also be omitted; if so, it will default to "y" (a normal, unmoderated group). The combination of defaults make it possible to use the text of the Control: header directly (although don't do this without checking the syntactic validity of the header first).

    This command can only be done while the server is running or throttled manually. It will update its internal state when a "go" command is sent. This command updates the active.times file as well. This command is forwarded; see NOTES below.

param letter value
    Change the specified server parameter. letter is the innd command-line option to set and value is the new value. For example:

        ctlinnd param i 5

    would direct the server to allow only five incoming connections. To enable or disable the action of the -n flag, use "n" for the letter and "y" or "n", respectively, for the value.

    The supported values for letter are "a", "c", "H", "i", "l", "n", "o", "T", "t", and "X".

pause reason
    Pause the server so that no incoming articles are accepted. No existing connections are closed, but the history database is closed. This should be used for short-term locks, such as when replacing the history database. If the server was not started with the -n y flag, this command also does the equivalent of a "readers" command with "no" as the flag and reason as the text, encoded in UTF-8.

perl flag
    Enable or disable Perl filtering. This command is only available if INN was built with Perl filtering support. If flag starts with "y", filtering is enabled; if it starts with "n", filtering is disabled.

python flag
    Enable or disable Python filtering. This command is only available if INN was built with Python filtering support. If flag starts with "y", filtering is enabled; if it starts with "n", filtering is disabled.

readers flag text
    Allow or disallow readers. If flag starts with the letter "n", then reading is disallowed by causing the server to pass text as the value of the -r flag to nnrpd. If flag starts with the letter "y" and text is either an empty string or the same string, encoded in UTF-8, that was used when reading was disabled, reading will be re-enabled.

    This command has no effect if nnrpd is being run separately rather than spawned by innd.

reject reason
    Remote connections (those that would not be handed off to nnrpd) are rejected with reason given as the explanation, encoded in UTF-8. Existing connections are not closed.

reload what reason
    Update the in-memory copy of server configuration files. what identifies what should be reloaded, and reason is reported to syslog in the message noting the reload.

    There is no way to reload inn.conf, storage.conf, or other configuration files for the storage or overview backends. To pick up changes to those files, use "ctlinnd xexec innd" to restart innd.

    If what is the empty string or the word "all", everything is reloaded. If it is the word "history", the history database is closed and re-opened. If it is the word "incoming.conf", the corresponding file is reloaded. If it is the word "active" or "newsfeeds", both the active and newsfeeds files are reloaded, which will also cause all outgoing feeds to be flushed and restarted.

    If what is the word "filter.perl", the filter_innd.pl file is reloaded. If the Perl filter defined a function "filter_before_reload", it will be called prior to re-reading filter_innd.pl. If the Perl function "filter_after_reload" is defined, it will be called after filter_innd.pl has been reloaded. Reloading the Perl filter does not enable filtering if it has been disabled; use "perl y" to do this instead. startup_innd.pl cannot be reloaded. This file is not available for reloading unless INN was compiled with Perl filtering support.

    If what is the word "filter.python", the filter_innd.py file is reloaded. If a Python method named "filter_before_reload" exists, it will be called prior to re-reading filter_innd.py. If a Python method named "__init__" exists, it will be called after filter_innd.py has been reloaded. Reloading the Python filter does not enable filtering if it has been disabled; use "python y" to do this. This file is not available for reloading unless INN was compiled with Python filtering support.

renumber group
    Update the low water and high water marks for group in the active file based on the information in the overview database. Regardless of the contents of the overview database, the high water mark will not be decreased. (Decreasing it may cause duplicate article numbers to be assigned after a crash, which can cause serious problems with the tradspool storage method.) If group is the empty string, all newsgroups are renumbered. Renumber only works if overview data has been created (if enableoverview is set to true in inn.conf).

renumberlow file
    Identical to the "lowmark" command.

reserve reason
    Require the next "pause" or "throttle" command to use reason as its reason, encoded in UTF-8. This reservation is cleared by giving an empty string for the reason. This is used by programs like expire to coordinate pauses and throttles of the server and avoid trampling on other instances of themselves.

rmgroup group
    Remove the specified newsgroup. The group is removed from the active file and its overview information is purged, making it immediately unavailable to readers. Unlike the "newgroup" command, this command does not update the active.times file.

    This command can only be done while the server is running or throttled manually. This command is forwarded; see NOTES below.

send feed text
    The specified text is sent as a control line to the exploder feed.

shutdown reason
    The server is shut down, with the specified reason recorded in the log and sent to all open connections. It is a good idea to send a "throttle" command first so that feeds can be shut down more gracefully.

    If Perl or Python filtering is compiled in and enabled, certain functions are called at "throttle" or "shutdown" (to save filter state to disk, for example). Consult the embedded filter documentation for details.

stathist (off | filename)
    Enable or disable generation of history performance statistics. If the parameter is "off", no statistics are gathered. Otherwise, statistics are written to the specified file. A parser for this file is provided in the contrib tree of the INN distribution.

status (off | interval)
    Adjust the frequency with which innd reports status information to syslog. Status reporting is turned off if "off" or 0 is given as the argument. Otherwise, status will be reported every interval seconds. See status in inn.conf(5) for information on how to set the default.

throttle reason
    Close all existing incoming connections and outgoing feeds and reject new connections. Close the history database. This should be used for long-term locks or for running a large number of "newgroup" and "rmgroup" commands without restarting all outgoing feeds between each one. (Note that changing the status of existing newsgroups when the server is throttled cannot be done.)

    If the server was not started with the -n y flag, then this command also does the equivalent of a "readers" command with "no" as the flag and reason as the text, encoded in UTF-8.

timer (off | interval)
    Adjust the frequency with which innd reports performance information to syslog. Performance monitoring is turned off if "off" or 0 is given as the argument. Otherwise, statistics will be reported every interval seconds to syslog. See timer in inn.conf(5) for information on how to set the default.

trace item flag
    Turn tracing on or off for the specified item. flag should start with the letter "y" or "n" to turn tracing on or off, respectively. If item starts with a number, tracing is set up for the specified innd channel, which must be an incoming NNTP feed. If it starts with the letter "i", general innd tracing is turned on or off. If it starts with the letter "n", future nnrpd processes spawned by "innd" will or will not be passed the -t flag, as appropriate. This will not affect any nnrpd processes already running, or nnrpd processes started by some means other than innd.

xabort reason
    Log the specified reason and then abort. On most systems, this will cause innd to dump a core file. This is only useful for debugging.

xexec path
    Shut down the server, but then rather than exiting, exec innd with all of its original arguments except for -r. path may be either "innd" or an empty string, both of which are equivalent. Any other value is an error.

    This is the easiest way to start a new copy of innd after upgrading or reload configuration files that can't be reloaded via the "reload" command.

NOTES
In addition to being acted on by the server, certain commands can be forwarded to an appropriate child process. If the site receiving the command is an exploder (such as buffchan) or a funnel that feeds into an exploder, the command can be forwarded. In this case, the server will send a command line to the exploder that consists of the ctlinnd command name. If the site funnels into an exploder that has an asterisk ("*") in its "W" flag (see newsfeeds(5) for more information on feed specifications), the site name will be appended to the command; otherwise, no argument is appended.

BUGS
ctlinnd uses Unix domain sockets on most systems to communicate with innd and is therefore limited by whatever maximum packet size the operating system imposes on Unix domain datagrams. This may mean that server replies are limited to 4 KB on some systems.

HISTORY
Written by Rich $alz <rsalz@uunet.uu.net> for InterNetNews. Rewritten in POD by Russ Allbery <rra@stanford.edu>.

$Id: ctlinnd.pod 8804 2009-11-15 09:29:51Z iulius $

SEE ALSO
active(5), active.times(5), buffchan(8), incoming.conf(5), innd(8), inndcomm(3), inn.conf(5), newsfeeds(5), nnrpd(8).