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modified post d39479 by Anonymous on Wed 8th Feb 2023 14:54
original post 42df74a0 by Anonymous on Wed 8th Feb 2023 13:33
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#!/usr/bin/ksh93

	1	+	#!/usr/bin/ksh93
1	2		#
2	3		# sshnfs - remote login client with NFSv4 forwarding
3	4		#
	5	+	# Example usage:
5	7		#
	8	+	# Written by Roland Mainz <roland.mainz@nrubsig.org>
7	9		#
	10	+
8	14		# returns:
9	15		# data.protocol
10	16		# data.host
11	17		# data.port (optional)
12	18		# data.path
13	19		#
14	20		function parse_url
15	21		{
16	22		typeset url="$2"
17	23		typeset leftover
18	24		nameref data="$1"
19	25
20	26		leftover="${url//~(Elr)(.+?):\/\/(.+?)(?:\|:([[:digit:]]+))(?:\/(.*?))?/x}"
21	27
22	28		[[ "$leftover" == 'x' ]] \|\| { print -u2 -f $"%s: Parser error\n" "$0" ; return 1 ; }
23	29
24	30		#print -v .sh.match
25	31
26	32		data.protocol="${.sh.match[1]}"
27	33		data.host="${.sh.match[2]}"
28	34		# bug: should be [[ -v .sh.match[3] }}, but ksh93u has bugs
29	35		[[ "${.sh.match[3]}" != '' ]] && integer data.port="${.sh.match[3]}"
30	36		data.path="${.sh.match[4]}"
31	37		return 0
32	38		}
33	39
34	40		function parse_nfs_url
35	41		{
36	42		typeset url="$2"
37	43		nameref data="$1"
38	44
39	45		parse_url data "$url" \|\| return 1
40	46
41		-	[[ "${data.protocol}" == 'nfs' ]] \|\| { print -u2 -f $"%s: Not a NFS url\n" "$0" ; return 1 ; }
	47	+	[[ "${data.protocol}" == 'nfs' ]] \|\| { print -u2 -f $"%s: Not a NFS url\n" "$0" ; return 1 ; }
	48	+	[[ "${data.host}" != '' ]] \|\| { print -u2 -f $"%s: NFS hostname missing\n" "$0" ; return 1 ; }
42	50
43	51		if [[ ! -v data.port ]] ; then
44	52		integer data.port=2049
45	53		fi
46	54
47	55		return 0
48	56		}
49	57
50	58
51	59		function main
52	60		{
	61	+	integer i
53	62		compound c
54	63		compound c.nfs_data
55	64		integer c.forward_port=4049
56		-	set -x
57		-	url="$1"
58		-	shift
59		-	parse_nfs_url c.nfs_data "$url" \|\| return 1
60	65
61		-	# $ ssh -f ... # puts the ssh process into the bachground, but
	66	+	set -o xtrace
62		-	# we have no way to determinate the process id. The "fix" is
	67	+	set -o nounset
70	68
71		-	ssh -Y -R "3049:localhost:${c.forward_port}" root@10.49.20.207
	69	+	url="$1" # fixme: we should use sshnfs -o NFSURL=nfs:// ...
	70	+	shift
72	72
73		-	kill -s TERM "${c.forward_pid}"
	73	+	parse_nfs_url c.nfs_data "$url" \|\| return 1
75	74
76		-	return 0
	75	+	#
77		-	}
	76	+	# extract jump host args
78		-
	77	+	#
79		-	main "$@"
	78	+	typeset -a c.ssh_jumphost_args
80		-
	79	+	for ((i=0 ; i < ${#c.args[@]} ; i++)) ; do
81		-	# EOF.
	80	+	if [[ "${c.args[i]}" == '-o' ]] ; then
82		-
	81	+	if [[ "${c.args[i+1]}" == ~(Elr)NFSJumphost=.+ ]] ; then
83		-
	82	+	c.ssh_jumphost_args+=( "-J" "${c.args[i+1]#NFSJumphost=}" )
84		-
	83	+	unset c.args[$i]
85		-
	84	+	unset c.args[$((i+1))]
86		-
	85	+	fi
87		-
	86	+	fi
88		-
	87	+	done
89	88
90		-
	89	+	# Forward NFS port from server to local machine
91		-
	90	+	# Notes:
92		-
	91	+	# - We use $ ssh -M ... # here as a way to terminate the port
93		-
	92	+	# forwarding process later using "-O exit" without the need
94		-
	93	+	# for a pid
95		-
	94	+	printf $"# Please enter the password for NFS server (%s)\n" \
96		-
	95	+	"root@${c.nfs_data.host}"
97		-
	96	+	ssh \
98		-
	97	+	-L "${c.forward_port}:localhost:${c.nfs_data.port}" \
99		-
	98	+	-M -S "$PWD/ssh-control-socket" \
100		-
	99	+	-N \
101		-
	100	+	-f -o ExitOnForwardFailure=yes \
102		-
	101	+	"${c.ssh_jumphost_args[@]}" \
103		-
	102	+	"root@${c.nfs_data.host}"
104		-
	103	+	(( $? == 0 )) \|\| { printf $"%s: NFS forwarding ssh failed with error code %d\n" "$0" $? ; return 1 ; }
105		-
	104	+	#ssh -S "$PWD/ssh-control-socket" -O 'check' "root@${c.nfs_data.host}"
106	105
107		-
	106	+	printf $"# Use this to mount the directory:\n"
108		-
	107	+	printf $"# $ mkdir /mnt_nfs\n"
109		-
	108	+	printf $"# mount -vvv -t nfs -o vers=4,port=%d localhost:/%s /mnt_nfs\n" \
110		-
	109	+	3049 \
111		-
	110	+	"${c.nfs_data.path}"
112	111
113		-
	112	+	ssh -R "3049:localhost:${c.forward_port}" "${c.args[@]}" # root@10.49.20.207
114	113
115		-
	114	+	ssh -S "$PWD/ssh-control-socket" -O 'exit' "root@${c.nfs_data.host}"
116		-
	115	+	wait
117	116
118		-
	117	+	return 0
119		-
	118	+	}
120	119
121		-
	120	+	main "$@"
122	121
123		-
	122	+	# EOF.
124	123