#!/bin/sh /etc/rc.common
# shellcheck disable=SC2034,SC3043

USE_PROCD=1
START=99

NAME="ua3f"
PROG="/usr/bin/$NAME"

start_service() {
    config_load "$NAME"

    local enabled
    config_get_bool enabled "enabled" "enabled" "0"
    [ "$enabled" -eq "1" ] || return 0

    local server_mode port bind ua log_level ua_regex partial_replace
    local rewrite_mode rewrite_rules
    local set_ttl set_ipid del_tcpts set_tcp_init_window
    config_get server_mode "main" "server_mode" "TPROXY"
    config_get port "main" "port" "1080"
    config_get bind "main" "bind" "127.0.0.1"
    config_get ua "main" "ua" "FFF"
    config_get ua_regex "main" "ua_regex" ""
    config_get_bool partial_replace "main" "partial_replace" 0
    config_get log_level "main" "log_level" "WARN"
    config_get rewrite_mode "main" "rewrite_mode" "GLOBAL"
    config_get rewrite_rules "main" "rewrite_rules" ""
    config_get_bool set_ttl "main" "set_ttl" 0
    config_get_bool set_ipid "main" "set_ipid" 0
    config_get_bool del_tcpts "main" "del_tcpts" 0
    config_get_bool set_tcp_init_window "main" "set_tcp_init_window" 0

    local desync_enabled desync_ct_bytes desync_ct_packets
    config_get_bool desync_enabled "main" "desync_enabled" 0
    if [ "$desync_enabled" -eq "1" ]; then
        config_get desync_ct_bytes "main" "desync_ct_bytes" "1500"
        config_get desync_ct_packets "main" "desync_ct_packets" "8"
    fi

    procd_open_instance "$NAME"
    procd_set_param command "$PROG"
    procd_append_param command -m "$server_mode"
    procd_append_param command -p "$port"
    procd_append_param command -b "$bind"
    procd_append_param command -f "$ua"
    procd_append_param command -r "$ua_regex"
    procd_append_param command -l "$log_level"
    procd_append_param command -x "$rewrite_mode"
    procd_append_param command -z "$rewrite_rules"
    [ "$partial_replace" = "1" ] && procd_append_param command -s
    procd_append_param env UA3F_TTL="$set_ttl"
    procd_append_param env UA3F_IPID="$set_ipid"
    procd_append_param env UA3F_TCPTS="$del_tcpts"
    procd_append_param env UA3F_TCP_INIT_WINDOW="$set_tcp_init_window"
    procd_append_param env UA3F_DESYNC="$desync_enabled"
    procd_append_param env UA3F_DESYNC_BYTES="$desync_ct_bytes"
    procd_append_param env UA3F_DESYNC_PACKETS="$desync_ct_packets"

    procd_set_param respawn
    procd_set_param stdout 1
    procd_set_param stderr 1
    procd_set_param limits nproc="unlimited" as="unlimited" memlock="unlimited" nofile="65535 65535"
    procd_set_param pidfile "/var/run/$NAME.pid"

    procd_close_instance
}

reload_service() {
    stop
    start
}

service_triggers() {
    procd_add_reload_trigger "$NAME"
}