can-socket 0.3.5

no frills CAN sockets (synchronous or async with tokio)
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55

#!/bin/sh

die() {
	printf "$@" >&2
	echo >&2
	exit 1
}

usage() {
	die "Usage: create-vcan-interface [add|del] NAME"
}

add_interface() {
	local name="$1"

	mkdir -p /run/create-vcan-interface || exit $?
	ip link add name "$name" type vcan || exit $?
	touch "/run/create-vcan-interface/$name" || exit "$?"
	ip link set dev "$name" up
}

delete_interface() {
	local name="$1"
	if [ ! -f /run/create-vcan-interface/$name ]; then
		printf "Interface %s not created by us, refusing to delete it\n" "$name" >&2
		exit 1;
	else
		rm "/run/create-vcan-interface/$name" || exit "$?"
		ip link del name "$name" || exit "$?"
	fi
}

main() {
	[ "$#" -eq 2 ] || usage

	if [ "$(id -u)" -ne "0" ]; then
		exec sudo "$0" "$@";
	fi

	local action="$1"
	local name="$2"

	case "$name" in
		vcan-*) ;;
		*) die "Interface name must start with vcan-";;
	esac

	case "$action" in
		"add") add_interface "$name" ;;
		"del") delete_interface "$name" ;;
		*) usage ;;
	esac
}

main "$@"