ccdd2b2b3c
sockstat can "hang" on getpwuid() calls in situations when FreeBSD is joined to a directory service (AD/LDAP etc) and the directory service fail to answer in a timely manner when trying to resolve numeric UIDs to user names. Submitted by: Caleb St. John <caleb@ixsystems.com> MFC after: 1 week
223 lines
5.6 KiB
Groff
223 lines
5.6 KiB
Groff
.\"-
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.\" Copyright (c) 1999 Dag-Erling Coïdan Smørgrav
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer
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.\" in this position and unchanged.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 30, 2020
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.Dt SOCKSTAT 1
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.Os
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.Sh NAME
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.Nm sockstat
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.Nd list open sockets
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.Sh SYNOPSIS
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.Nm
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.Op Fl 46CcLlnSsUuvw
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.Op Fl j Ar jid
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.Op Fl p Ar ports
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.Op Fl P Ar protocols
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.Sh DESCRIPTION
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The
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.Nm
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command lists open Internet or
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.Ux
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domain sockets.
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.Pp
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The following options are available:
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.Bl -tag -width Fl
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.It Fl 4
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Show
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.Dv AF_INET
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(IPv4) sockets.
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.It Fl 6
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Show
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.Dv AF_INET6
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(IPv6) sockets.
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.It Fl C
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Display the congestion control module, if applicable.
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This is currently only implemented for TCP.
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.It Fl c
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Show connected sockets.
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.It Fl j Ar jail
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Show only sockets belonging to the specified jail ID or name.
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.It Fl L
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Only show Internet sockets if the local and foreign addresses are not
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in the loopback network prefix
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.Li 127.0.0.0/8 ,
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or do not contain the IPv6 loopback address
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.Li ::1 .
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.It Fl l
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Show listening sockets.
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.It Fl n
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Do not resolve numeric UIDs to user names.
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.It Fl p Ar ports
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Only show Internet sockets if the local or foreign port number
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is on the specified list.
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The
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.Ar ports
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argument is a comma-separated list of port numbers and ranges
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specified as first and last port separated by a dash.
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.It Fl P Ar protocols
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Only show sockets of the specified
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.Ar protocols .
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The
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.Ar protocols
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argument is a comma-separated list of protocol names,
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as they are defined in
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.Xr protocols 5 .
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.It Fl q
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Quiet mode, do not print the header line.
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.It Fl S
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Display the protocol stack, if applicable.
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This is currently only implemented for TCP.
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.It Fl s
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Display the protocol state, if applicable.
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This is currently only implemented for SCTP and TCP.
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.It Fl U
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Display the remote UDP encapsulation port number, if applicable.
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This is currently only implemented for SCTP.
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.It Fl u
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Show
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.Dv AF_LOCAL
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.Pq Ux
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sockets.
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.It Fl v
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Verbose mode.
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.It Fl w
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Use wider field size for displaying addresses.
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.El
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.Pp
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If neither
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.Fl 4 , 6
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or
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.Fl u
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is specified,
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.Nm
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will list sockets in all three domains.
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.Pp
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If neither
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.Fl c
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or
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.Fl l
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is specified,
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.Nm
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will list both listening and connected sockets.
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.Pp
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The information listed for each
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socket is:
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.Bl -tag -width "FOREIGN ADDRESS"
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.It Li USER
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The user who owns the socket.
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.It Li COMMAND
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The command which holds the socket.
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.It Li PID
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The process ID of the command which holds the socket.
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.It Li FD
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The file descriptor number of the socket.
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.It Li PROTO
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The transport protocol associated with the socket for Internet
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sockets, or the type of socket
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.Pq stream, datagram, or seqpacket
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for
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.Ux
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sockets.
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.It Li LOCAL ADDRESS
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For Internet sockets, this is the address the local end of the socket
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is bound to (see
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.Xr getsockname 2 ) .
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For bound
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.Ux
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sockets, it is the socket's filename.
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For other
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.Ux
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sockets, it is a right arrow followed by the endpoint's filename, or
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.Dq Li ??
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if the endpoint could not be determined.
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.It Li FOREIGN ADDRESS
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(Internet sockets only)
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The address the foreign end of the socket is bound to (see
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.Xr getpeername 2 ) .
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.It Li ENCAPS
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The remote UDP encapsulation port number if
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.Fl U
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is specified (only for SCTP).
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.It Li PATH STATE
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The path state if
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.Fl s
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is specified (only for SCTP).
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.It Li CONN STATE
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The connection state if
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.Fl s
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is specified (only for SCTP or TCP).
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.It Li STACK
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The protocol stack if
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.Fl S
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is specified (only for TCP).
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.It Li CC
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The congestion control if
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.Fl C
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is specified (only for TCP).
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.El
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.Pp
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If a socket is associated with more than one file descriptor,
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it is shown multiple times.
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If a socket is not associated with any file descriptor,
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the first four columns have no meaning.
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.Sh EXAMPLES
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Show information for IPv4 sockets listening on port 22 using protocol
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TCP:
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.Bd -literal -offset indent
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$ sockstat -4 -l -P tcp -p 22
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.Ed
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.Pp
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Show information for sockets using either TCP or UDP, if neither, the local nor
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the foreign addresses are in the loopback network:
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.Bd -literal -offset indent
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$ sockstat -L -P tcp,udp
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.Ed
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.Pp
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Show TCP IPv6 sockets which are listening and connected (default):
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.Bd -literal -offset indent
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$ sockstat -6 -P tcp
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.Ed
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.Sh SEE ALSO
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.Xr fstat 1 ,
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.Xr netstat 1 ,
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.Xr procstat 1 ,
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.Xr inet 4 ,
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.Xr inet6 4 ,
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.Xr protocols 5
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Fx 3.1 .
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.Sh AUTHORS
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The
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.Nm
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command and this manual page were written by
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.An Dag-Erling Sm\(/orgrav Aq Mt des@FreeBSD.org .
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