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.TH "TALER-EXCHANGE-HTTPD" "1" "Jun 20, 2022" "0.9" "GNU Taler"
.SH NAME
taler-exchange-httpd \- run Taler exchange (with RESTful API)
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.SH SYNOPSIS
.sp
\fBtaler\-exchange\-httpd\fP
[\fB\-a\fP\ |\ \fB\-\-allow\-timetravel\fP]
[\fB\-C\fP\ |\ \fB\-\-connection\-close\fP]
[\fB\-c\fP\ \fIFILENAME\fP\ |\ \fB\-\-config=\fP‌\fIFILENAME\fP]
[\fB\-f\fP\ \fIFILENAME\fP\ |\ \fB\-\-file\-input=\fP‌\fIFILENAME\fP]
[\fB\-h\fP\ |\ \fB\-\-help\fP]
[\fB\-L\fP\ \fILOGLEVEL\fP\ |\ \fB\-\-loglevel=\fP‌\fILOGLEVEL\fP]
[\fB\-l\fP\ \fIFILENAME\fP\ |\ \fB\-\-logfile=\fP‌\fIFILENAME\fP]
[\fB\-n\fP\ \fIN\fP\ |\ \fB\-\-num\-threads=\fP\fIN\fP]
[\fB\-r**|\fP\-\-allow\-reuse\-address**]
[\fB\-T\fP\ \fIUSEC\fP\ |\ \fB\-\-timetravel=\fP\fIUSEC\fP]
[\fB\-t\fP\ \fISECONDS\fP\ |\ \fB\-\-timeout=\fP‌\fISECONDS\fP]
[\fB\-v\fP\ |\ \fB\-\-version\fP]
.SH DESCRIPTION
.sp
\fBtaler\-exchange\-httpd\fP is a command\-line tool to run the Taler
exchange (HTTP server). The required configuration, keys and database
must exist before running this command.
.sp
Its options are as follows:
.INDENT 0.0
.TP
\fB\-a\fP | \fB\-\-allow\-timetravel\fP
Allow clients to request /keys for arbitrary timestamps.
This should only be enabled for testing and development,
as clients could abuse this in denial of service attacks,
as it makes the /keys response generation much more expensive.
.TP
\fB\-C\fP | \fB\-\-connection\-close\fP
Force each HTTP connection to be closed after each request (useful in
combination with \fB\-f\fP to avoid having to wait for
netcat (nc) to time out).
.TP
\fB\-c\fP \fIFILENAME\fP | \fB\-\-config=\fP‌\fIFILENAME\fP
Use the configuration and other resources for the merchant to operate
from FILENAME.
.TP
\fB\-f\fP \fIFILENAME\fP | \fB\-\-file\-input=\fP‌\fIFILENAME\fP
This option is only available if the exchange was compiled with the
configure option \-\-enable\-developer\-mode. It is used for generating
test cases against the exchange using AFL. When this option is
present, the HTTP server will
.INDENT 7.0
.IP 1. 3
terminate after the first client’s HTTP connection is completed,
and
.IP 2. 3
automatically start such a client using a helper process based on
the nc(1) or ncat(1) binary using FILENAME as the standard input
to the helper process.
.UNINDENT
.sp
As a result, the process will effectively run with \fIFILENAME\fP as the
input from an HTTP client and then immediately exit. This is useful
to test taler\-exchange\-httpd against many different possible inputs
in a controlled way.
.TP
\fB\-h\fP | \fB\-\-help\fP
Print short help on options.
.TP
\fB\-L\fP \fILOGLEVEL\fP | \fB\-\-loglevel=\fP‌\fILOGLEVEL\fP
Specifies the log level to use. Accepted values are: \fBDEBUG\fP, \fBINFO\fP,
\fBWARNING\fP, \fBERROR\fP\&.
.TP
\fB\-l\fP \fIFILENAME\fP | \fB\-\-logfile=\fP‌\fIFILENAME\fP
Send logging output to \fIFILENAME\fP\&.
.TP
\fB\-r\fP | \fB\-\-allow\-reuse\-address\fP
Allow the exchange to re\-use the listen port even if another service
is already using it. Useful if multiple processes are used to increase
processing capacity.
.TP
\fB\-T\fP \fIUSEC\fP | \fB\-\-timetravel=\fP\fIUSEC\fP
Modify the system time by \fIUSEC\fP microseconds.
\fIUSEC\fP may be prefixed with \fB+\fP or \fB\-\fP (e.g. \fB\-T +300\fP).
This option is intended for debugging/testing only.
.TP
\fB\-t\fP \fISECONDS\fP | \fB\-\-timeout=\fP‌\fISECONDS\fP
Specifies the number of SECONDS after which the HTTPD should close
(idle) HTTP connections.
.TP
\fB\-v\fP | \fB\-\-version\fP
Print version information.
.UNINDENT
.SH SIGNALS
.sp
\fBtaler\-exchange\-httpd\fP responds to the following signals:
.INDENT 0.0
.TP
.B \fBSIGTERM\fP
Sending a SIGTERM to the process will cause it to shutdown cleanly.
.TP
.B \fBSIGHUP\fP
Sending a SIGHUP to the process will cause it to re\-execute the
taler\-exchange\-httpd binary in the PATH, passing it the existing
listen socket. Then the old server process will automatically exit
after it is done handling existing client connections; the new server
process will accept and handle new client connections.
.UNINDENT
.SH SEE ALSO
.sp
taler\-exchange\-dbinit(1), taler\-exchange\-offline(1),
taler\-exchange\-reservemod(1), taler.conf(5).
.SH BUGS
.sp
Report bugs by using \fI\%https://bugs.taler.net\fP or by sending electronic
mail to <\fI\%taler@gnu.org\fP>.
.SH AUTHOR
GNU Taler contributors
.SH COPYRIGHT
2014-2022 Taler Systems SA (GPLv3+ or GFDL 1.3+)
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