Dict Xiong 3bd0121786
[dev] GPG agent forwarding; improve riot, sagt, tmux and zsh (#46)
* feat(riot): support literal ipv6 addresses (with or without ports given)

feat(riot): -v, -4, and -6

fix(riot): do not call external binaries if possible

* feat(riot): command git

* build(riot-config): nasp.fit -> jump.nasp.fit

* feat: add bnd and nor and completions

* fix(zshrc): bnd exit when build error

* fix(tmux): press ^a twice to send ^a

* feat(riot): sshl supports specifying local port and unix sock

* feat(riot): sshr for ssh -R

* feat(riot): -o ServerAliveInterval=60

* feat(riot): conditionally RequestTTY

* feat: zsh completion for beam and beaml

* fix(frigg): ddns get ip

* fix(riot): tmux error with window number and spaces

The fix to spaces is just a workaround. Issue may still exist when
command contains spaces.

* feat(riot): ControlPersist=60s

* fix(ci): riot

* feat(tmux): prevent tmux from exiting copy mode after selection with mouse

see:
- https://www.reddit.com/r/tmux/comments/v73005/how_to_prevent_tmux_from_exiting_copy_mode_after/
- https://www.reddit.com/r/tmux/comments/1ltms6a/how_to_select_text_in_tmux_without_having_it_jump/

* feat(tmux): F12 to passthru

* fix(riot): ControlPersist 60s -> 5s

* feat: sne: search and edit

* feat(ssh): add key ip17/sep

* feat(tmux): press ESC to exit copy mode

* feat(ssh): add key sk1/piv/9a

* feat(ssh): add key sk1/fido2

* feat(ssh): add key openpgp:0x8774BF70 and remove key ip14/sep and ltp2 (asu127)

* feat(sagent): sagt gpg; improve code

* feat(sagent): check pinentry and give notes

* feat(riot): add GPG agent forwarding

Signed-off-by: Dict Xiong <me@beardic.cn>

* feat: gitconf add gpg signature; remove macos from ci

* feat(eid): add sk1 9a cert

* feat(riot): better help and fix option quite->quiet

* feat(riot): separate command options from riot options

* feat(sagt): gpg-pin and associated tests

* feat(riot): zsh completions

* fix: Apply suggestions from code review

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* fix(riot): simplify and secure

* fix: syntax

---------

Signed-off-by: Dict Xiong <me@beardic.cn>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
2026-08-13 20:10:55 +08:00

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#!/usr/bin/env bash
# connect to iot services
THIS_DIR=$( cd "$( dirname "${BASH_SOURCE[0]:-${(%):-%x}}" )" && pwd )
DFS_SKIP_ARG_PARSE=1
source "$THIS_DIR/../tools/common.sh"
unset DFS_SKIP_ARG_PARSE
RIOT_TRUST_CLIENT=${RIOT_TRUST_CLIENT:-${DFS_TRUST:-0}}
RIOT_TRUST_SERVER=${RIOT_TRUST_SERVER:-0}
EXTRA_SSH_OPTIONS=()
GPG_FORWARD=0
# config
RIOT_CONFIG_FILES=(
"$DOTFILES/riot-config.sh"
"$HOME/.config/riot-config.sh"
"riot-config.sh"
)
load_riot_config() {
local file
for file in "${RIOT_CONFIG_FILES[@]}"; do
if [[ -f "$file" ]]; then
source "$file"
fi
done
}
# check if port number valid
check_port() {
[[ "$1" =~ ^[1-9][0-9]{0,4}$ ]] || return 1
[[ $1 -lt 65536 && $1 -gt 0 ]] || return 1
return 0
}
# check if username valid
check_username() {
[[ "$1" =~ ^[a-z][-a-z0-9_]*$ ]] || return 1
return 0
}
# get single server setting
# may be called more than once
get_server_meta() {
# returns:
RET_HOSTNAME=""
RET_TRUST_SERVER=0
RET_PORT="" # optional
RET_USERNAME="" # optional
RET_JUMP_SERVER="" # optional
# body
local remote="$1"
# extract username from user@...
if [[ "$remote" == *@* ]]; then
RET_USERNAME=${remote%%@*}
remote=${remote#*@}
check_username $RET_USERNAME || fmt_warning \"$RET_USERNAME\" is not a valid unix username
fi
# extract port from ...:port
if [[
"$remote" =~ ^[^:]+:[1-9][0-9]*$ # contains only one colon
|| "$remote" =~ ^\[.+\]:[1-9][0-9]*$ # in the form of [host]:port
|| "$remote" =~ :::[1-9][0-9]*$ # in the form of :::port
|| "$remote" =~ ^([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4}:[1-9][0-9]*$ # full ipv6 address with port
|| "$remote" =~ ^[0-9A-Fa-f:]+%.+:[1-9][0-9]*$ # ipv6 address with scope and port
]]; then
RET_PORT=${remote##*:}
remote=${remote%:*}
check_port $RET_PORT || fmt_fatal invalid port number \"$RET_PORT\"
fi
# remove square brackets
if [[ "$remote" =~ ^\[.*\]$ ]]; then
remote=${remote:1:-1}
fi
# presets -- match remote
local remote_func="$remote.remote"
if is_function "$remote_func"; then
"$remote_func"
fi
# presets -- match domain
RET_HOSTNAME=${remote}
local domain=${remote##*.}
local host=${remote%.*}
# if it contains no dot and is not ipv6
if [[ "$remote" != *.* && "$remote" != *:* ]]; then
domain="default"
fi
local domain_func="$domain.domain"
if is_function "$domain_func"; then
"$domain_func"
elif is_function ".domain"; then
".domain"
fi
}
parse_remote() {
# remote setting, including jump servers
# called for every remote
# provides:
SERVER=""
TRUST_SERVER=1
PORT="" # optional
USERNAME="" # optional
SSH_OPTIONS=("-o" "ServerAliveInterval=60")
if [[ -t 1 ]]; then
SSH_OPTIONS+=("-o" "RequestTTY=yes")
fi
if [[ "$RIOT_TRUST_CLIENT" == "1" ]]; then
SSH_OPTIONS+=("-o" "PermitLocalCommand=yes")
if [[ "$(get_os_type)" != "msys" ]]; then
test "$DFS_DRY_RUN" = "1" || mkdir -p ~/.ssh/master-socket
SSH_OPTIONS+=("-o" "ControlMaster=auto" "-o" "ControlPersist=5s" "-o" "ControlPath=~/.ssh/master-socket/%C")
fi
fi
# handle input
local remote="$1"
local jump_servers=""
# loop for jump servers
while [[ -n $remote ]]; do
local server=${remote%%/*}
remote=${remote#*/}
get_server_meta "$server"
if [[ -n "$RET_JUMP_SERVER" ]]; then
jump_servers="$jump_servers${jump_servers:+,}$RET_JUMP_SERVER"
fi
# only if all servers are trusted
TRUST_SERVER=$((TRUST_SERVER*RET_TRUST_SERVER))
if [[ "$server" == "$remote" || -z "$remote" ]]; then
SERVER="$RET_HOSTNAME"
PORT="$RET_PORT"
USERNAME="$RET_USERNAME"
remote=""
else
jump_servers="$jump_servers${jump_servers:+,}$RET_USERNAME${RET_USERNAME:+@}$RET_HOSTNAME${RET_PORT:+:}$RET_PORT"
fi
done
# construct cmd
if [[ "$RIOT_TRUST_SERVER" == "1" || "$TRUST_SERVER" == "1" ]]; then
SSH_OPTIONS+=("-o" "ForwardX11=yes" "-o" "ForwardAgent=yes")
fi
if [[ -n "$jump_servers" ]]; then
SSH_OPTIONS+=("-o" "ProxyJump=$jump_servers")
fi
}
check_local_gpg_agent() {
LOCAL_GPG_EXTRA_SOCKET=""
GPG_FORWARD_ERROR=""
if ! command -v gpgconf > /dev/null 2>&1 || ! command -v gpg-connect-agent > /dev/null 2>&1; then
GPG_FORWARD_ERROR="gpgconf or gpg-connect-agent is not available"
return 1
fi
local agent_info
agent_info=$(gpg-connect-agent --no-autostart 'GETINFO pid' /bye 2>/dev/null || true)
if ! grep -qE '^D [1-9][0-9]*$' <<< "$agent_info"; then
GPG_FORWARD_ERROR="local gpg-agent is not running"
return 1
fi
LOCAL_GPG_EXTRA_SOCKET=$(gpgconf --list-dirs agent-extra-socket 2>/dev/null || true)
if [[ -z "$LOCAL_GPG_EXTRA_SOCKET" || "$LOCAL_GPG_EXTRA_SOCKET" != /* \
|| "$LOCAL_GPG_EXTRA_SOCKET" == *:* || "$LOCAL_GPG_EXTRA_SOCKET" == *$'\r'* \
|| "$LOCAL_GPG_EXTRA_SOCKET" == *$'\n'* || ! -S "$LOCAL_GPG_EXTRA_SOCKET" ]]; then
GPG_FORWARD_ERROR="local gpg-agent extra socket is unavailable"
return 1
fi
local extra_info
extra_info=$(gpg-connect-agent --raw-socket "$LOCAL_GPG_EXTRA_SOCKET" 'GETINFO version' /bye 2>/dev/null || true)
if ! grep -qE '^D [^[:space:]]+' <<< "$extra_info"; then
GPG_FORWARD_ERROR="local gpg-agent extra socket exists but is not accepting connections"
return 1
fi
}
probe_remote_gpg_socket() {
REMOTE_GPG_SOCKET=""
# The probe must be an independent connection: reusing or creating a
# multiplex master here races with the immediately following login.
local query_cmd=(ssh "-S" "none" "-o" "ClearAllForwardings=yes")
if [[ -n "$PORT" ]]; then
query_cmd+=("-p" "$PORT")
fi
query_cmd+=(
"${SSH_OPTIONS[@]}"
"${EXTRA_SSH_OPTIONS[@]}"
"-T"
"$USERNAME${USERNAME:+@}$SERVER"
'socket=$(gpgconf --list-dirs agent-socket 2>/dev/null) || exit 10
case "$socket" in /*/S.gpg-agent) ;; *) exit 11;; esac
case "$socket" in *:*) exit 11;; esac
case "$socket" in *"
"*) exit 11;; esac
carriage_return=$(printf "\r")
case "$socket" in *"$carriage_return"*) exit 11;; esac
if [ -e "$socket" ] && [ ! -S "$socket" ]; then exit 12; fi
if [ -S "$socket" ] && command -v gpg-connect-agent >/dev/null 2>&1; then
agent_mode=$(gpg-connect-agent --raw-socket "$socket" "GETINFO restricted" /bye 2>/dev/null || true)
case "$agent_mode" in *"D 1"*) exit 13;; esac
fi
systemd_socket=0
if command -v systemctl >/dev/null 2>&1 && systemctl --user is-active --quiet gpg-agent.socket >/dev/null 2>&1; then
systemd_socket=1
fi
gpgconf --kill gpg-agent >/dev/null 2>&1 || exit 14
rm -f "$socket" || exit 15
printf "%s\n%s\n" "$socket" "$systemd_socket"'
)
local output status
if output=$("${query_cmd[@]}"); then
status=0
else
status=$?
fi
case "$status" in
0) ;;
10) GPG_FORWARD_ERROR="gpgconf is unavailable on the remote host" ;;
11) GPG_FORWARD_ERROR="remote gpgconf returned an invalid agent socket" ;;
12) GPG_FORWARD_ERROR="refusing to remove the non-socket remote gpg-agent path" ;;
13) GPG_FORWARD_ERROR="another forwarded gpg-agent is already using the remote socket; close that session first" ;;
14) GPG_FORWARD_ERROR="failed to stop the remote gpg-agent (the socket may belong to another forwarding session)" ;;
15) GPG_FORWARD_ERROR="failed to remove the stale remote gpg-agent socket" ;;
*) GPG_FORWARD_ERROR="failed to query or clean the remote gpg-agent socket (ssh status $status)" ;;
esac
if [[ "$status" != "0" ]]; then
return 1
fi
local remote_systemd_socket
REMOTE_GPG_SOCKET=${output%%$'\n'*}
remote_systemd_socket=${output#*$'\n'}
if [[ -z "$REMOTE_GPG_SOCKET" || "$REMOTE_GPG_SOCKET" == *$'\r'* || "$REMOTE_GPG_SOCKET" == *$'\n'* \
|| "$REMOTE_GPG_SOCKET" != /*/S.gpg-agent || "$REMOTE_GPG_SOCKET" == *:* \
|| "$remote_systemd_socket" != "0" && "$remote_systemd_socket" != "1" ]]; then
GPG_FORWARD_ERROR="remote gpgconf returned an invalid agent socket: $output"
return 1
fi
if [[ "$remote_systemd_socket" == "1" ]]; then
fmt_warning "remote gpg-agent.socket is active and may race with GPG forwarding; consider disabling its socket activation"
fi
}
prepare_gpg_forwarding() {
if [[ "$DFS_DRY_RUN" == "1" ]]; then
REMOTE_GPG_SOCKET="<remote-gpg-agent-socket>"
LOCAL_GPG_EXTRA_SOCKET="<local-gpg-agent-extra-socket>"
else
if ! check_local_gpg_agent; then
fmt_fatal "cannot forward gpg-agent: $GPG_FORWARD_ERROR"
fi
if ! probe_remote_gpg_socket; then
fmt_fatal "cannot forward gpg-agent: $GPG_FORWARD_ERROR"
fi
fi
SSH_OPTIONS+=(
# The probe already removed the old socket. Do not let the main SSH
# connection unlink a path recreated during the gap between them.
"-o" "StreamLocalBindUnlink=no"
"-o" "ExitOnForwardFailure=yes"
"-R" "$REMOTE_GPG_SOCKET:$LOCAL_GPG_EXTRA_SOCKET"
)
}
print_cmd() {
local output=""
for s in "${CMD[@]}"; do
if [[ "$s" =~ [\ \\\'\"] ]]; then # needs to be escaped
s="${s@Q}"
fi
output+="$s "
done
fmt_note "--> ${output% }"
}
eval_or_echo() {
local DO=""
tmux_win=${tmux_win:-0}
if [[ "$DFS_DRY_RUN" == "1" ]]; then
DO=echo
fi
if [[ "$USE_TMUX" == "1" ]]; then
if [[ -z "$TMUX_SESS" ]]; then
TMUX_SESS=riot-$(date +%s)
$DO tmux new-session -d -s $TMUX_SESS bash -l
else
tmux_win=$((tmux_win+1))
$DO tmux new-window -t $TMUX_SESS:$tmux_win -d bash -l
fi
local command
printf -v command '%q ' "${CMD[@]}"
$DO tmux send-keys -l -t "$TMUX_SESS:$tmux_win" "${command% }"
$DO tmux send-keys -t "$TMUX_SESS:$tmux_win" Enter
else
$DO "${CMD[@]}"
fi
}
# ssh series
prepare_ssh_cmd() {
local ssh_bin="${1:-ssh}"
if [[ "$ssh_bin" == "scp" || "$ssh_bin" == "sftp" ]]; then
local port_param='-P'
else
local port_param='-p'
fi
CMD=(
"$ssh_bin"
"${PORT:+$port_param}" "$PORT"
"${SSH_OPTIONS[@]}"
"${EXTRA_SSH_OPTIONS[@]}"
"$SCP_SRC"
"$USERNAME${USERNAME:+@}$SERVER"
"$SCP_DST"
"${@:2}"
)
for i in ${!CMD[@]}; do if [[ -z "${CMD[i]}" ]]; then unset CMD[i]; fi; done
}
# ssh
run_ssh()
{
prepare_ssh_cmd "$@"
print_cmd
eval_or_echo
}
# sshl
run_sshl()
{
local arg left right localsock access
local res="${1//[^:]}"
local lorr="-L"
if [[ "${FUNCNAME[1]}" == "run_sshr" ]]; then
lorr="-R"
fi
if [[ ${#res} -eq 2 ]]; then
arg="$1"
elif [[ ${#res} -eq 0 ]]; then
if [[ "$lorr" == "-R" ]]; then
arg="$1"
else
arg="$(get_free_port):localhost:$1"
fi
else
left=${1%%:*}
right=${1##*:}
if check_port "$left"; then
arg="$1"
elif check_port "$right"; then
arg="$(get_free_port):$1"
else
arg="$1"
localsock=1
fi
fi
if [[ "$localsock" == "1" ]]; then
access="unix://${arg%%:*}"
else
access="localhost:${arg%%:*}"
fi
SSH_OPTIONS+=("-NC" "$lorr" "$arg")
prepare_ssh_cmd ssh
print_cmd
fmt_note " > please access $access"
eval_or_echo
}
# sshr
run_sshr()
{
run_sshl "$1"
}
# sshd
run_sshd()
{
local port=${1:-$(get_free_port)}
SSH_OPTIONS+=("-NC" "-D" "$port")
prepare_ssh_cmd ssh
print_cmd
fmt_note " > please access localhost:$port"
eval_or_echo
}
# scp
run_scp() {
local src="$1"
local dst="$2"
local dst_is_remote=1
# whoever is ./*, it can't be the remote; whoever not exists on local, it's possible the remote.
# it is suggested to use ./* for local files.
if [[ "$src" != "./"* && ( "$dst" == "./"* || ( ! -e "$src" && -e "$dst" ) ) ]]; then
dst_is_remote=0
fi
if [[ "$dst_is_remote" == "1" ]]; then
SCP_SRC="$src"
SERVER="$SERVER":"$dst"
else
SERVER="$SERVER":"$src"
SCP_DST="$dst"
fi
SSH_OPTIONS+=("-r")
prepare_ssh_cmd scp
print_cmd
eval_or_echo
}
# ping
run_ping() {
CMD=(ping)
if [[ "$1" == "ping4" ]]; then
CMD+=(-4)
elif [[ "$1" == "ping6" ]]; then
CMD+=(-6)
fi
CMD+=(-c 4 "$SERVER")
print_cmd
eval_or_echo
}
# remove host keys
remove_hostkey() {
local key
if [[ -z "$PORT" || "$PORT" == "22" ]]; then
key=$SERVER
else
key="[$SERVER]:$PORT"
fi
ssh-keygen -R "$key"
}
# main
print_help()
{
local pager=(cat)
if [[ -t 1 ]] && command -v less > /dev/null 2>&1; then
pager=(less -R)
fi
cat <<EOF | "${pager[@]}"
NAME
riot - connect to remote hosts using SSH presets
SYNOPSIS
${0##*/} [OPTION]... REMOTE [OPTION]... [COMMAND [COMMAND-ARG]...]
DESCRIPTION
Connect to REMOTE using the matching configuration from riot-config.sh.
COMMAND defaults to ssh. Separate multiple remotes with commas and jump
hosts with slashes. OPTIONs may appear before COMMAND. Once COMMAND is
found, all remaining arguments are passed to it without further parsing.
OPTIONS
-4
Force ssh to use IPv4 addresses only.
-6
Force ssh to use IPv6 addresses only.
-D, --dry-run
Print commands without executing them.
-d, --dev
Enable shell execution tracing.
-g, --gpg
Forward the local GPG agent during an interactive SSH login. Use only
with trusted remote hosts.
-h, --help
Display this help and exit.
-l, --lite
Enable dotfiles lite mode for loaded configuration.
-o SSH-OPTION
Pass an option to ssh. This option may be specified multiple times.
-p, --password
Use password authentication instead of public-key authentication.
-q, --quiet
Enable dotfiles quiet mode for loaded configuration.
-t, --trust
Trust the remote and enable X11 and SSH agent forwarding.
-v
Enable verbose ssh output.
--color
Force colored output.
--tmux
Open SSH sessions in tmux windows.
--
End option parsing.
COMMANDS
ssh [SSH-ARG]...
Open an SSH session. This is the default command.
tmux [SSH-ARG]...
Open SSH sessions in multiple tmux windows.
git [GIT-ARG]...
Run git on the remote host.
sshl [LOCAL-PORT:REMOTE-HOST:]REMOTE-PORT
Create local port forwarding with ssh -L.
sshr [REMOTE-HOST:]REMOTE-PORT
Create remote port forwarding with ssh -R.
sshd [LOCAL-PORT]
Create dynamic port forwarding with ssh -D.
zssh [SSH-ARG]...
Open a zssh session.
sftp [SFTP-ARG]...
Open an SFTP session.
scp SOURCE DESTINATION
Copy files to or from the remote host.
rm
Remove the remote host key from known_hosts.
ping, ping4, ping6
Ping the remote host.
EOF
}
router() {
local positional=()
local arg=""
local option=""
local remaining=""
local option_value=""
while [[ $# -gt 0 || -n "$arg" ]]; do
if [[ -z "$arg" ]]; then
arg=$1
shift
fi
# Normalize a long option or one item from a short-option group.
remaining=""
case "$arg" in
-- )
positional+=("$@")
break
;;
--* )
option=$arg
arg=""
;;
-?* )
option=${arg:0:2}
remaining=${arg:2}
arg=${remaining:+-$remaining}
;;
* )
positional+=("$arg")
arg=""
if [[ "${#positional[@]}" -ge 2 ]]; then
positional+=("$@")
break
fi
continue
;;
esac
case "$option" in
-h|--help )
print_help
exit 0
;;
-t|--trust )
RIOT_TRUST_SERVER=1
;;
-g|--gpg )
GPG_FORWARD=1
;;
--tmux )
USE_TMUX=1
;;
-p|--password )
EXTRA_SSH_OPTIONS+=("-o" "PasswordAuthentication=yes" "-o" "PubkeyAuthentication=no")
;;
-D|--dry-run )
export DFS_DRY_RUN=1
;;
-d|--dev )
export DFS_DEV=1
set -x
;;
-l|--lite )
export DFS_LITE=1
;;
-q|--quiet )
export DFS_QUIET=1
;;
--color )
export DFS_COLOR=1
setup_color
;;
-4|-6|-v )
EXTRA_SSH_OPTIONS+=("$option")
;;
-o )
if [[ -n "$remaining" ]]; then
option_value=$remaining
arg=""
else
[[ $# -gt 0 ]] || fmt_fatal "option '-o' requires an argument"
option_value=$1
shift
fi
EXTRA_SSH_OPTIONS+=("-o" "$option_value")
;;
* )
fmt_fatal "unknown option: '$option'"
;;
esac
done
if [[ "${positional[2]}" == "--" ]]; then
positional=("${positional[@]:0:2}" "${positional[@]:3}")
fi
IFS=',' read -ra remotes <<< "${positional[0]}"
for i in ${!remotes[@]}; do if [[ -z "${remotes[i]}" ]]; then unset remotes[i]; fi; done
if [[ "${#positional[@]}" == "0" || "${#remotes[@]}" == "0" ]]; then
print_help
exit 1
fi
load_riot_config
if [[ "$GPG_FORWARD" == "1" && ( \
( "${positional[1]}" != "" && "${positional[1]}" != "ssh" && "${positional[1]}" != "tmux" ) \
|| "${#positional[@]}" -gt 2 ) ]]; then
fmt_fatal "gpg-agent forwarding is only supported for interactive SSH login"
fi
for i in ${!remotes[@]}; do
remote="${remotes[i]}"
local batch_func="${remote}.batch"
if is_function "$batch_func"; then
"$batch_func"
continue
fi
parse_remote "$remote"
case "${positional[1]}" in
ssh|tmux|"" )
[[ "${positional[1]}" == tmux ]] && USE_TMUX=1
if [[ "$GPG_FORWARD" == "1" ]]; then
prepare_gpg_forwarding
fi
run_ssh ssh "${positional[@]:2}"
;;
git )
if printf '%s\0' "${positional[@]:2}" | grep -Fxqz -- '-C'; then
run_ssh ssh git "${positional[@]:2}"
else
run_ssh ssh git -C "$(pwd)" "${positional[@]:2}"
fi
;;
ping|ping4|ping6 )
test "${#positional[@]}" -eq 2 || fmt_fatal "ping requires no arguments"
run_ping "${positional[1]}"
;;
zssh )
run_ssh zssh "${positional[@]:2}"
;;
sftp )
run_ssh sftp "${positional[@]:2}"
;;
sshl )
test -n "${positional[2]}" || fmt_fatal "no target address provided"
test "${#positional[@]}" -eq 3 || fmt_fatal "sshl requires exactly one argument"
run_sshl "${positional[2]}"
;;
sshr )
test -n "${positional[2]}" || fmt_fatal "no target address provided"
test "${#positional[@]}" -eq 3 || fmt_fatal "sshr requires exactly one argument"
run_sshr "${positional[2]}"
;;
sshd )
test "${#positional[@]}" -le 3 || fmt_fatal "sshd requires one or no arguments"
if [[ "${#positional[@]}" -eq 3 ]]; then
check_port "${positional[2]}" || fmt_fatal "invalid port number: ${positional[2]}"
run_sshd "${positional[2]}"
else
run_sshd
fi
;;
scp )
test "${#positional[@]}" -eq 4 || fmt_fatal "scp requires exactly two arguments: source and destination"
test -n "${positional[2]}" || fmt_fatal "no source path specified"
test -n "${positional[3]}" || fmt_fatal "no destination path specified"
run_scp "${positional[2]}" "${positional[3]}"
;;
rm )
test "${#positional[@]}" -eq 2 || fmt_fatal "rm requires no arguments"
remove_hostkey
;;
* )
print_help
fmt_fatal "unknown command: ${positional[1]}"
;;
esac
done
if [[ -n "$TMUX_SESS" && "$DFS_DRY_RUN" != "1" ]]; then
tmux attach-session -t $TMUX_SESS
fi
}
router "$@"