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modified post 94a8efad6a by Anonymous on Wed 15th Feb 2023 12:38
original post 28082dfc0 by Anonymous on Fri 10th Feb 2023 11:58
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#!/usr/bin/ksh93

1	1		#!/usr/bin/ksh93
2	2		#
3	3		# sshnfs - remote login client with NFSv4 forwarding
4	4		#
5	5		# Example usage:
6	6		# $ ksh sshnfs.ksh -o NFSURL=nfs://localhost/export/home/rmainz root@10.49.20.207 #
7	7		# $ ksh sshnfs.ksh -o NFSURL=nfs://localhost/export/home/rmainz -o NFSJumphost=derfwpc5131 root@10.49.20.207
8	8		#
9	9		# Written by Roland Mainz <roland.mainz@nrubsig.org>
10	10		#
11	11
12	12		#
13	13		# parse url
14	14		#
15	15		# returns:
16	16		# data.protocol
17	17		# data.host
18	18		# data.port (optional)
19	19		# data.path
20	20		#
21	21		function parse_url
22	22		{
23	23		typeset url="$2"
24	24		typeset leftover
25	25		nameref data="$1"
26	26
27	27		# ~(E) is POSIX extended regular expression matching (instead of
28	28		# shell pattern)
29		-	leftover="${url//~(Elr)(.+?):\/\/(.+?)(?:\|:([[:digit:]]+))(?:\/(.*?))?/x}"
	29	+	leftover="${url//~(Elr)(.+?):\/\/(.+?)(?:\|:([[:digit:]]+))(?:\/(.*?))?/X}"
30	30
31	31		# All parsed data should be captured via eregex in .sh.match - if
32		-	# there is anything left then the input string did not properly match
	32	+	# there is anything left (except the 'X') then the input string did not
33		-	# the eregex
	33	+	# properly match the eregex
34		-	[[ "$leftover" == 'x' ]] \|\| { print -u2 -f $"%s: Parser error\n" "$0" ; return 1 ; }
	34	+	[[ "$leftover" == 'X' ]] \|\| { print -u2 -f $"%s: Parser error\n" "$0" ; return 1 ; }
35	35
36	36		data.protocol="${.sh.match[1]}"
37	37		data.host="${.sh.match[2]}"
38	38		# bug: should be [[ -v .sh.match[3] }}, but ksh93u has bugs
39	39		[[ "${.sh.match[3]}" != '' ]] && integer data.port="${.sh.match[3]}"
40	40		data.path="${.sh.match[4]}"
	41	+
41	42		return 0
42	43		}
43	44
44	45		function parse_nfs_url
45	46		{
46	47		typeset url="$2"
47	48		nameref data="$1"
48	49
49	50		parse_url data "$url" \|\| return 1
50	51
51	52		[[ "${data.protocol}" == 'nfs' ]] \|\| { print -u2 -f $"%s: Not a NFS url\n" "$0" ; return 1 ; }
52	53		[[ "${data.host}" != '' ]] \|\| { print -u2 -f $"%s: NFS hostname missing\n" "$0" ; return 1 ; }
53	54		[[ "${data.path}" != '' ]] \|\| { print -u2 -f $"%s: NFS path missing\n" "$0" ; return 1 ; }
54	55
55	56		if [[ ! -v data.port ]] ; then
	57	+	# use # default NFSv4 TCP port number (see
56	59		integer data.port=2049
57	60		fi
58	61
59	62		return 0
60	63		}
61	64
62	65
63	66		function main
64	67		{
65	68		integer i
66		-	compound c
67		-	compound c.nfs_data
68		-	integer c.forward_port=34049
69	69		integer retval
	70	+	compound c=(
70	73
	74	+	# TCP port on destination machine where we forward the
73	77
	78	+	# fixme: "/tmp" vs. "${XDG_RUNTIME_DIR:-/tmp}" ?
75	81
	82	+	#set -o xtrace
76	88		for ((i=0 ; i < ${#c.args[@]} ; i++)) ; do
77	89		if [[ "${c.args[i]}" == '-o' ]] ; then
78	90		case "${c.args[i+1]-}" in
79	91		'NFSURL='*)
80		-	unset c.nfs_data
	92	+	unset c.nfs_server
	93	+	compound c.nfs_server
81	94		typeset c.url="${c.args[i+1]#NFSURL=}"
82		-	parse_nfs_url c.nfs_data "${c.url}" \|\| return 1
	95	+	parse_nfs_url c.nfs_server "${c.url}" \|\| return 1
83	96		unset c.args[$i] c.args[$((i+1))]
84	97		((i++))
85	98		;;
86	99		'NFSJumphost='*)
87	100		[[ ! -v c.ssh_jumphost_args ]] && typeset -a c.ssh_jumphost_args
88	101		c.ssh_jumphost_args+=( "-J" "${c.args[i+1]#NFSJumphost=}" )
89	102		unset c.args[$i] c.args[$((i+1))]
90	103		((i++))
91	104		;;
92	105		esac
93	106		fi
94	107		done
95	108
96		-	# bug: should be [[ -v c.nfs_data ]], but ksh93u has bugs
	109	+	if [[ -v c.nfs_server ]] ; then
98	110		# Forward NFS port from server to local machine
99	111		# Notes:
100	112		# - We use $ ssh -M ... # here as a way to terminate the port
101	113		# forwarding process later using "-O exit" without the need
102	114		# for a pid
103		-	printf $"# Please enter the password for NFS server (%s)\n" \
	115	+	print -u2 -f $"# Please enter the password for NFS server (%s)\n" \
104		-	"root@${c.nfs_data.host}"
	116	+	"root@${c.nfs_server.host}"
105	117		ssh \
106		-	-L "${c.forward_port}:localhost:${c.nfs_data.port}" \
	118	+	-L "${c.local_forward_port}:localhost:${c.nfs_server.port}" \
107		-	-M -S "$PWD/ssh-control-socket" \
	119	+	-M -S "${c.ssh_control_socket_name}" \
108	120		-N \
109		-	-f -o ExitOnForwardFailure=yes \
	121	+	-f -o 'ExitOnForwardFailure=yes' \
110	122		"${c.ssh_jumphost_args[@]}" \
111		-	"root@${c.nfs_data.host}"
	123	+	"root@${c.nfs_server.host}"
112	124		if (( $? != 0 )) ; then
113		-	printf $"%s: NFS forwarding ssh failed with error code %d\n" "$0" $?
	125	+	print -u2 -f $"%s: NFS forwarding ssh failed with error code %d\n" "$0" $?
114	126		return 1
115	127		fi
117	128
118		-	printf $"# Use this to mount the directory:\n"
	129	+	# debug
119		-	printf $"# $ mkdir /mnt_nfs\n"
	130	+	${mydebug} && ssh -S "${c.ssh_control_socket_name}" -O 'check' "root@${c.nfs_server.host}"
123	131
	132	+	print -u2 -f $"# Use this to mount the directory:\n"
124	138		# add NFS forwarding options to main ssh argument list
125		-	c.args=( "-R" "33049:localhost:${c.forward_port}" "${c.args[@]}" )
	139	+	c.args=(
	140	+	'-R' "${c.destination_nfs_port}:localhost:${c.local_forward_port}"
126	144		fi
127	145
	146	+	${mydebug} && print -v c
129	147
130		-	if [[ -v c.nfs_data.host ]] ; then
	148	+	ssh "${c.args[@]}" ; (( retval=$? ))
133	149
	150	+	if [[ -v c.nfs_server ]] ; then
135	153
	154	+	wait
136	156		return $retval
137	157		}
138	158
139	159		main "$@"
	160	+	exit $?
140	161
141	162		# EOF.
142	163