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Add a -V flag to bgplgd

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.\" $OpenBSD: bgplgd.8,v 1.8 2024/01/26 18:11:49 job Exp $
.\"
.\" Copyright (c) 2021 Claudio Jeker <claudio@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: January 26 2024 $
.Dt BGPLGD 8
.Os
.Sh NAME
.Nm bgplgd
.Nd a bgpctl FastCGI server
.Sh SYNOPSIS
.Nm
.Op Fl d
.Op Fl p Ar path
.Op Fl S Ar socket
.Op Fl s Ar socket
.Op Fl U Ar user
.Op Fl V
.Sh DESCRIPTION
.Nm
is a server which implements the FastCGI Protocol to execute
.Xr bgpctl 8
commands.
.Nm
is a simple server that implements a simple web API to query
.Xr bgpd 8 .
.Pp
.Nm
opens a socket at
.Pa /var/www/run/bgplgd.sock ,
owned by www:www,
with permissions 0660.
It will then drop privileges to user
.Qq _bgplgd ,
.Xr unveil 2
the
.Xr bgpctl 8
binary
and restrict itself with
.Xr pledge 2 .
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl d
Do not daemonize.
If this option is specified,
.Nm
will run in the foreground and log to stderr.
.It Fl p Ar path
Use
.Ar path
instead of
.Xr bgpctl 8
to query
.Xr bgpd 8 .
.It Fl S Ar socket
Use
.Ar socket
instead of the default
.Pa /var/run/bgpd.rsock
to communicate with
.Xr bgpd 8 .
.It Fl s Ar socket
Create and bind to alternative local socket at
.Ar socket .
.It Fl U Ar user
Change the owner of
.Pa /var/www/run/bgplgd.sock
to
.Ar user
and its primary group instead of the default www:www.
.It Fl V
Show the version and exit.
.El
.Pp
.Nm
provides the following API endpoints.
Unless further specified the endpoints do not take any parameters:
.Bl -tag -width Ds
.It Pa /interfaces
Show the interface states.
.It Pa /memory
Show RIB memory statistics.
.It Pa /metrics
Output various statistics in OpenMetrics format.
.It Pa /neighbors
Show detailed neighbors information.
The output can be limited with the following parameters:
.Pp
.Bl -tag -width "neighbor=peer" -compact
.It Cm neighbor Ns = Ns Ar peer
Show information for a specific neighbor.
.Ar peer
may be the neighbor's address or description.
.It Cm group Ns = Ns Ar name
Show only entries from the specified peer group.
.El
.It Pa /nexthops
Show the list of BGP nexthops and the result of their validity check.
.It Pa /rib
Show routes from the bgpd(8) Routing Information Base.
The following parameters can be used to filter the output:
.Pp
.Bl -tag -width "neighbor=peer" -compact
.It Cm neighbor Ns = Ns Ar peer
Show information for a specific neighbor.
.Ar peer
may be the neighbor's address or description.
.It Cm group Ns = Ns Ar name
Show only entries from the specified peer group.
.It Cm as Ns = Ns Ar number
Show only entries with the specified source AS number.
.It Cm community Ns = Ns Ar string
.It Cm ext-community Ns = Ns Ar string
.It Cm large-community Ns = Ns Ar string
Show only entries that match the specified community.
.It Xo
.Ic af Ns = Ns
.Pq Ic ipv4 | ipv6 | vpnv4 | vpnv6
.Xc
Show only entries that match the specified address family.
.It Cm rib Ns = Ns Ar name
Show only entries from the RIB with name
.Ar name .
.It Xo
.Ic ovs Ns = Ns
.Pq Ic valid | not-found | invalid
.Xc
Show only prefixes that match the specified Origin Validation State.
.It Xo
.Ic avs Ns = Ns
.Pq Ic valid | invalid | unknown
.Xc
Show only prefixes that match the specified ASPA Validation State.
.It Cm best Ns = Ns 1
Show only selected routes.
.It Cm error Ns = Ns 1
Show only prefixes which are marked invalid and were treated as withdrawn.
.It Cm invalid Ns = Ns 1
Show only prefixes which are not eligible.
.It Cm leaked Ns = Ns 1
Show only prefixes where a route leak was detected.
.It Cm prefix Ns = Ns Ar addr
Show only entries that match prefix either as the best matching route or
show the entry for this CIDR prefix.
.It Cm all Ns = Ns 1
Show all entries in the specified prefix range.
.It Cm or-shorter Ns = Ns 1
Show all entries covering and including the specified prefix.
.El
.It Pa /rtr
Show a list of all RTR sessions.
.It Pa /sets
Show a list summarizing all roa-set, as-set, prefix-set, and origin-set tables.
.It Pa /summary
Show a list of all neighbors, including information about the session state
and message counters.
.El
.Sh EXAMPLES
An example setup in
.Xr httpd 8
is:
.Bd -literal -offset indent
        location "/bgplgd/*" {
                fastcgi socket "/run/bgplgd.sock"
                request strip 1
        }
.Ed
.Sh SEE ALSO
.Xr bgpctl 8 ,
.Xr bgpd 8 ,
.Xr httpd 8
.Sh HISTORY
The
.Nm
server first appeared in
.Ox 7.2 .
.Sh AUTHORS
.An Claudio Jeker Aq Mt claudio@openbsd.org