gpg-connect-agent - Online in the Cloud

PROGRAM:

NAME

gpg-connect-agent - Communicate with a running agent

SYNOPSIS

gpg-connect-agent [options][commands]

DESCRIPTION

The gpg-connect-agent is a utility to communicate with a running gpg-agent. It is useful
to check out the commands gpg-agent provides using the Assuan interface. It might also be
useful for scripting simple applications. Input is expected at stdin and out put gets
printed to stdout.

It is very similar to running gpg-agent in server mode; but here we connect to a running
instance.

The following options may be used:

-v

--verbose
Output additional information while running.

-q

--quiet
Try to be as quiet as possible.

--homedir dir
Set the name of the home directory to dir. If this option is not used, the home
directory defaults to ‘~/.gnupg’. It is only recognized when given on the command
line. It also overrides any home directory stated through the environment variable
‘GNUPGHOME’ or (on Windows systems) by means of the Registry entry
HKCU\Software\GNU\GnuPG:HomeDir.

On Windows systems it is possible to install GnuPG as a portable application. In
this case only this command line option is considered, all other ways to set a home
directory are ignored.

To install GnuPG as a portable application under Windows, create an empty file name
‘gpgconf.ctl’ in the same directory as the tool ‘gpgconf.exe’. The root of the
installation is than that directory; or, if ‘gpgconf.exe’ has been installed
directly below a directory named ‘bin’, its parent directory. You also need to
make sure that the following directories exist and are writable: ‘ROOT/home’ for
the GnuPG home and ‘ROOT/var/cache/gnupg2’ for internal cache files.

--agent-program file
Specify the agent program to be started if none is running. The default value is
determined by running gpgconf with the option --list-dirs. Note that the pipe
symbol (|) is used for a regression test suite hack and may thus not be used in the
file name.

--dirmngr-program file
Specify the directory manager (keyserver client) program to be started if none is
running. This has only an effect if used together with the option --dirmngr.

--dirmngr
Connect to a running directory manager (keyserver client) instead of to the gpg-
agent. If a dirmngr is not running, start it.

-S

--raw-socket name
Connect to socket name assuming this is an Assuan style server. Do not run any
special initializations or environment checks. This may be used to directly
connect to any Assuan style socket server.

-E

--exec Take the rest of the command line as a program and it's arguments and execute it as
an assuan server. Here is how you would run gpgsm:
gpg-connect-agent --exec gpgsm --server
Note that you may not use options on the command line in this case.

--no-ext-connect
When using -S or --exec, gpg-connect-agent connects to the assuan server in
extended mode to allow descriptor passing. This option makes it use the old mode.

--no-autostart
Do not start the gpg-agent or the dirmngr if it has not yet been started.

-r file

--run file
Run the commands from file at startup and then continue with the regular input
method. Note, that commands given on the command line are executed after this
file.

-s

--subst
Run the command /subst at startup.

--hex Print data lines in a hex format and the ASCII representation of non-control
characters.

--decode
Decode data lines. That is to remove percent escapes but make sure that a new line
always starts with a D and a space.

CONTROL COMMANDS

While reading Assuan commands, gpg-agent also allows a few special commands to control its
operation. These control commands all start with a slash (/).

/echo args
Just print args.

/let name value
Set the variable name to value. Variables are only substituted on the input if the
/subst has been used. Variables are referenced by prefixing the name with a dollar
sign and optionally include the name in curly braces. The rules for a valid name
are identically to those of the standard bourne shell. This is not yet enforced
but may be in the future. When used with curly braces no leading or trailing white
space is allowed.

If a variable is not found, it is searched in the environment and if found copied
to the table of variables.

Variable functions are available: The name of the function must be followed by at
least one space and the at least one argument. The following functions are
available:

get Return a value described by the argument. Available arguments are:

cwd The current working directory.

homedir
The gnupg homedir.

sysconfdir
GnuPG's system configuration directory.

bindir GnuPG's binary directory.

libdir GnuPG's library directory.

libexecdir
GnuPG's library directory for executable files.

datadir
GnuPG's data directory.

serverpid
The PID of the current server. Command /serverpid must have been
given to return a useful value.

unescape args
Remove C-style escapes from args. Note that \0 and \x00 terminate the
returned string implicitly. The string to be converted are the entire
arguments right behind the delimiting space of the function name.

unpercent args

unpercent+ args
Remove percent style escaping from args. Note that %00 terminates the
string implicitly. The string to be converted are the entire arguments
right behind the delimiting space of the function name. unpercent+ also maps
plus signs to a spaces.

percent args

percent+ args
Escape the args using percent style escaping. Tabs, formfeeds, linefeeds,
carriage returns and colons are escaped. percent+ also maps spaces to plus
signs.

errcode arg

errsource arg

errstring arg
Assume arg is an integer and evaluate it using strtol. Return the gpg-error
error code, error source or a formatted string with the error code and error
source.

+

-

*

/

% Evaluate all arguments as long integers using strtol and apply this
operator. A division by zero yields an empty string.

!

|

& Evaluate all arguments as long integers using strtol and apply the logical
operators NOT, OR or AND. The NOT operator works on the last argument only.

/definq name var
Use content of the variable var for inquiries with name. name may be an asterisk
(*) to match any inquiry.

/definqfile name file
Use content of file for inquiries with name. name may be an asterisk (*) to match
any inquiry.

/definqprog name prog
Run prog for inquiries matching name and pass the entire line to it as command line
arguments.

/datafile name
Write all data lines from the server to the file name. The file is opened for
writing and created if it does not exists. An existing file is first truncated to
0. The data written to the file fully decoded. Using a single dash for name
writes to stdout. The file is kept open until a new file is set using this command
or this command is used without an argument.

/showdef
Print all definitions

/cleardef
Delete all definitions

/sendfd file mode
Open file in mode (which needs to be a valid fopen mode string) and send the file
descriptor to the server. This is usually followed by a command like INPUT FD to
set the input source for other commands.

/recvfd
Not yet implemented.

/open var file [mode]
Open file and assign the file descriptor to var. Warning: This command is
experimental and might change in future versions.

/close fd
Close the file descriptor fd. Warning: This command is experimental and might
change in future versions.

/showopen
Show a list of open files.

/serverpid
Send the Assuan command GETINFO pid to the server and store the returned PID for
internal purposes.

/sleep Sleep for a second.

/hex

/nohex Same as the command line option --hex.

/decode

/nodecode
Same as the command line option --decode.

/subst

/nosubst
Enable and disable variable substitution. It defaults to disabled unless the
command line option --subst has been used. If /subst as been enabled once, leading
whitespace is removed from input lines which makes scripts easier to read.

/while condition

/end These commands provide a way for executing loops. All lines between the while and
the corresponding end are executed as long as the evaluation of condition yields a
non-zero value or is the string true or yes. The evaluation is done by passing
condition to the strtol function. Example:

/subst
/let i 3
/while $i
/echo loop couter is $i
/let i ${- $i 1}
/end

/if condition

/end These commands provide a way for conditional execution. All lines between the if
and the corresponding end are executed only if the evaluation of condition yields a
non-zero value or is the string true or yes. The evaluation is done by passing
condition to the strtol function.

/run file
Run commands from file.

/bye Terminate the connection and the program

/help Print a list of available control commands.

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