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utils: ixll: Add link-local wrappers for ping/ssh/scp
This commit is contained in:
Tobias Waldekranz
committed by
Joachim Wiberg
Joachim Wiberg
parent
0c917ab37e
commit
36716dab42
Executable
+92
@@ -0,0 +1,92 @@
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#!/bin/sh
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set -e
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. $(dirname $(readlink -f "$0"))/libll.sh
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usage()
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{
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local me="$(basename $0)"
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cat <<EOF
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usage: $me [-A] <command> [<args>]
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Wrap various existing network facilities such that an interface name
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may be supplied in places where a hostname is otherwise expected.
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Options:
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-A
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For commands requiring authentication, use password
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authentication with username "admin" and password "admin".
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Commands:
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peer <iface>
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Return the address of the first IPv6 neighbor to respond on
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<iface>'s local LAN.
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ping <iface>
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Send ping to all-hosts group, with link-local scope, on <iface>,
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suppressing loopbacked packets.
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ssh <iface> [<ssh-arguments>]
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ssh(1) to the neighboring host on <iface>.
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scp <src> <dst>
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scp(1) from <src> to <dst>, but any host specified in either
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<src> or <dst> is assumed to be an interface name, which is
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expanded to a neighboring host on that interface.
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${0} help
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Display this message.
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Examples:
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Start interactive ssh(1) session to the neighbor to eth0
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$me ssh eth0
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Copy /etc/hostname from the neighbor to eth0, using admin/admin
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$me -A scp eth0:/etc/hostname /tmp/hostname
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EOF
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}
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while getopts "A" opt; do
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case ${opt} in
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A)
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LLSSH_USER=admin
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LLSSH_PASS=admin
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;;
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esac
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done
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shift $((OPTIND - 1))
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if [ $# -lt 1 ]; then
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usage && exit 1
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fi
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cmd="$1"
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shift
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case "$cmd" in
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help)
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usage && exit 0
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;;
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peer)
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llpeer "$@"
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;;
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ping)
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llping "$@"
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;;
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scp)
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llscp "$@"
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;;
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ssh)
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llssh "$@"
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;;
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*)
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echo "Unknown command \"$cmd\"" >2
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exit 1
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;;
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esac
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+146
@@ -0,0 +1,146 @@
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# Utility functions for communicating with IPv6 neighbors on the local
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# LAN
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# Usage: llping <iface>
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#
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# Send ping to all-hosts group, with link-local scope, on <iface>,
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# suppressing loopbacked packets.
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llping()
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{
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local iface="$1"
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shift
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ping -L ff02::1%$iface "$@"
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}
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# Usage: llpeer <iface>
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#
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# Return the address of the first IPv6 neighbor to respond on
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# <iface>'s local LAN. It is thus typically only useful in scenarios
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# where only one neighbor exists
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llpeer()
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{
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local iface="$1"
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shift
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llping $iface -c1 "$@" | \
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awk '/bytes from/ { sub(/:$/, "", $4); print($4); exit(0); }'
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}
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llssh_expand()
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{
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local old_ifs="$IFS"
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local orig="$1"
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local fmt="$2"
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local peer=
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local user=
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local iface=
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IFS=@
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set $1
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IFS="$old_ifs"
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case $# in
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1)
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user="$LLSSH_USER"
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iface="$1"
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;;
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2)
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user="$1"
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iface="$2"
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;;
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*)
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echo "Error: Invalid peer \"$orig1\"" >&2
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return 1
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;;
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esac
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if [ -d "/sys/class/net/$iface" ]; then
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peer="$(llpeer $iface -w3)"
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else
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peer="$iface"
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fi
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if [ ! "$peer" ]; then
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echo "Error: No peer responded on $iface" >&2
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return 1
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fi
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case "$fmt" in
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ssh)
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;;
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scp)
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peer="[$peer]"
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;;
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*)
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echo "Internal error: Invalid format \"$fmt\"" >&2
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return 1
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;;
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esac
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[ "$user" ] && peer="$user@$peer"
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echo $peer
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}
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# Usage: llssh <destination> [<ssh-args>]
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#
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# ssh(1) to <destination>, but if the host matches an existing
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# interface name, expand it to a neighboring host on that interface.
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llssh()
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{
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local remote="$1"
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shift
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local peer="$(llssh_expand $remote ssh)"
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[ "$peer" ] || return 1
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local sshpasscmd=
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[ "$LLSSH_PASS" ] && sshpasscmd="sshpass -p$LLSSH_PASS $LLSSHPASS_OPTS"
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$sshpasscmd ssh $LLSSH_OPTS $peer "$@"
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}
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llscp_expand()
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{
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local orig="$1"
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local old_ifs="$IFS"
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local peer=
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IFS=:
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set $@
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IFS="$old_ifs"
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case $# in
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1)
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echo "$1"
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;;
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2)
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peer="$(llssh_expand $1 scp)"
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[ "$peer" ] || return 1
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echo "$peer:$2"
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;;
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*)
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echo "Error: Invalid location \"$orig1\"" >&2
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return 1
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;;
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esac
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}
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# Usage: llscp <src> <dst>
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#
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# scp(1) from <src> to <dst>, but expand any host specified in either
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# <src> or <dst>, which matches an existing interface name, to a
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# neighboring host on that interface.
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llscp()
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{
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local src="$(llscp_expand $1)"
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local dst="$(llscp_expand $2)"
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[ "$src" -a "$dst" ] || return 1
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shift 2
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local sshpasscmd=
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[ "$LLSSH_PASS" ] && sshpasscmd="sshpass -p$LLSSH_PASS $LLSSHPASS_OPTS"
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$sshpasscmd scp $LLSCP_OPTS "$src" "$dst"
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}
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