SYNOPSIS
use Net::DNS::SEC::Tools::realmmgr;
$dir = realmmgr_dir();
$idfile = realmmgr_idfile();
$id = realmmgr_getid();
realmmgr_dropid();
realmmgr_rmid();
realmmgr_cmdint();
$runflag = realmmgr_running();
realmmgr_halt();
realmmgr_channel(1);
($cmd,$data) = realmmgr_getcmd();
$ret = realmmgr_verifycmd($cmd);
realmmgr_sendcmd(CHANNEL_CLOSE,REALMCMD_STARTREALM,"example-realm");
realmmgr_sendcmd(CHANNEL_WAIT,REALMCMD_STARTREALM,"example-realm");
($retcode, $respmsg) = realmmgr_getresp();
DESCRIPTION
The Net::DNS::SEC::Tools::realmmgr module provides standard, platform-independent methods for a program to communicate with DNSSEC-Tools' dtrealms realms manager. There are two interface classes described here: general interfaces and communications interfaces.GENERAL INTERFACES
The interfaces to the Net::DNS::SEC::Tools::realmmgr module are given below.- realmmgr_dir()
- This routine returns dtrealms's directory.
- realmmgr_idfile()
- This routine returns dtrealms's id file.
- realmmgr_getid()
-
This routine returns dtrealms's process id. If a non-zero value
is passed as an argument, the id file will be left open and accessible through
the PIDFILE file handle. See the WARNINGS section below.
Return Values:
On success, the first portion of the file contents (up to 80 characters) is returned. -1 is returned if the id file does not exist. - realmmgr_dropid()
-
This interface ensures that another instance of dtrealms is not
running and then creates a id file for future reference.
Return Values:
1 - the id file was successfully created for this process 0 - another process is already acting as dtrealms -1 - unable to create the id file - realmmgr_rmid()
-
This interface deletes dtrealms's id file.
Return Values:
1 - the id file was successfully deleted 0 - no id file exists -1 - the calling process is not dtrealms -2 - unable to delete the id file - realmmgr_cmdint()
-
This routine informs dtrealms that a command has been sent via
realmmgr_sendcmd().
Return Values:
-1 - an invalid process id was found for dtrealms Anything else indicates the number of processes that were signaled. (This should only ever be 1.) - realmmgr_running()
-
This routine determines if dtrealms is running and returns a value indicating
the status.
Return Values:
1 - dtrealms is running. 0 - The process listed in the dtrealms process id file is not running. -1 - Unable to get the dtrealms process id. - realmmgr_halt()
-
This routine informs dtrealms to shut down.
In the current implementation, the return code from the kill() command is returned.
-1 - an invalid process id was found for dtrealms Anything else indicates the number of processes that were signaled. (This should only ever be 1.)
DTREALMS COMMUNICATIONS INTERFACES
- realmmgr_channel(serverflag)
-
This interface sets up a persistent channel for communications with dtrealms.
If serverflag is true, then the server's side of the channel is created.
If serverflag is false, then the client's side of the channel is created.
Currently, the connection may only be made to the localhost. This may be changed to allow remote connections, if this is found to be needed.
Return Values:
1 - Communications channel successfully established. 0 - Unable to connect to the server. -1 - Unable to create a Unix socket. -2 - Unable to bind to the Unix socket. (server only) -3 - Unable to change the permissions on the Unix socket. (server only) -4 - Unable to listen on the Unix socket. (server only) -5 - The socket name was longer than allowed for a Unix socket. - realmmgr_queuecmd(cmdname, value)
- This interface internally remembers a command and it's optional value for later processing. See the realmmgr_getcmd() next for further details.
- realmmgr_getcmd()
-
realmmgr_getcmd() processes commands that need to be dealt with. If
there are any internally stored commands queued via the
realmmgr_queuecmd() function, they are dealt with first. After that it
retrieves a command sent over dtrealms's communications channel by a
client program. The command and the command's data are sent in each
message.
The command and the command's data are returned to the caller.
- realmmgr_sendcmd(closeflag,cmd,data)
-
realmmgr_sendcmd() sends a command to dtrealms. The command must be one
of the commands from the table below. This interface creates a communications
channel to dtrealms and sends the message. The channel is not closed, in
case the caller wants to receive a response from dtrealms.
The available commands and their required data are:
command data purpose ------- ---- ------- REALMCMD_COMMAND realm, command run command in a realm REALMCMD_DISPLAY 1/0 start/stop dtrealms' graphical display REALMCMD_GETSTATUS none currently unused REALMCMD_LOGFILE log filename change the log file REALMCMD_LOGLEVEL log level set a new logging level REALMCMD_LOGMSG log message add a message to the log REALMCMD_LOGTZ timezone set timezone for log messages REALMCMD_NODISPLAY 0 stop dtrealms' graphical display REALMCMD_REALMSTATUS none get status of the realms REALMCMD_SHUTDOWN none stop dtrealms and its realms REALMCMD_STARTALL none start all stopped realms REALMCMD_STOPALL none stop all running realms REALMCMD_STARTREALM realm name restart a suspended realm REALMCMD_STOPREALM realm name stop realm REALMCMD_STATUS none get status of dtrealmsThe data aren't checked for validity by realmmgr_sendcmd(); validity checking is a responsibility of dtrealms.
If the caller does not need a response from dtrealms, then closeflag should be set to CHANNEL_CLOSE; if a response is required then closeflag should be CHANNEL_WAIT. These values are boolean values, and the constants aren't required.
On success, 1 is returned. If an invalid command is given, 0 is returned.
- realmmgr_getresp()
-
After executing a client command sent via realmmgr_sendcmd(), dtrealms
will send a response to the client. realmmgr_getresp() allows
the client to retrieve the response.
A return code and a response string are returned, in that order. Both are specific to the command sent.
- realmmgr_verifycmd(cmd)
-
realmmgr_verifycmd() verifies that cmd is a valid command for dtrealms.
1 is returned for a valid command; 0 is returned for an invalid command.
1 is returned for a valid command; 0 is returned for an invalid command.
WARNINGS
1. realmmgr_getid() attempts to exclusively lock the id file. Set a timer if this matters to you.2. realmmgr_getid() has a nice little race condition. We should lock the file prior to opening it, but we can't do so without it being open.