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9bdefa0226
The daemon sniffs DHCP packets even on bridged interfaces and provides fingerprints of requests via ubus. Signed-off-by: John Crispin <john@phrozen.org>
61 lines
966 B
Bash
61 lines
966 B
Bash
#!/bin/sh /etc/rc.common
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# Copyright (c) 2021 OpenWrt.org
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START=40
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USE_PROCD=1
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PROG=/usr/sbin/udhcpsnoop
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add_option() {
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local type="$1"
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local name="$2"
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local default="$3"
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config_get val "$cfg" "$name"
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[ -n "$val" ] && json_add_$type "$name" "${val:-$default}"
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}
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add_device() {
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local cfg="$1"
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config_get_bool disabled "$cfg" disabled 0
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[ "$disabled" -gt 0 ] && return
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config_get name "$cfg" name
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json_add_object "$name"
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add_option boolean ingress 1
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add_option boolean egress 1
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json_close_object
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}
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reload_service() {
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json_init
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config_load dhcpsnoop
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json_add_object devices
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config_foreach add_device device
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json_close_object
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ubus call dhcpsnoop config "$(json_dump)"
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}
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service_triggers() {
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procd_add_reload_trigger dhcpsnoop
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}
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start_service() {
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procd_open_instance
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procd_set_param command "$PROG"
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procd_set_param respawn
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procd_close_instance
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}
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service_started() {
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ubus -t 10 wait_for dhcpsnoop
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[ $? = 0 ] && reload_service
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}
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