mirror of
https://github.com/caiwx86/small-packages.git
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99 lines
2.5 KiB
Bash
Executable File
99 lines
2.5 KiB
Bash
Executable File
#!/bin/sh
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# DHCP leases and static hosts to hosts
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. /lib/functions.sh
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. /usr/share/passwall/utils.sh
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LOCK_FILE=${LOCK_PATH}/${CONFIG}_lease2hosts.lock
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DNSMASQ_LEASE_FILE=$(uci -q get 'dhcp.@dnsmasq[0].leasefile')
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DNSMASQ_LEASE_FILE=${DNSMASQ_LEASE_FILE:-/tmp/dhcp.leases}
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ODHCPD_LEASE_FILE=$(uci -q get dhcp.odhcpd.leasefile)
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ODHCPD_LEASE_FILE=${ODHCPD_LEASE_FILE:-/tmp/odhcpd.leases}
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HOSTS_FILE="$TMP_PATH2/dhcp-hosts"
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TMP_FILE="/tmp/dhcp-hosts.tmp"
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exec 9>"$LOCK_FILE"
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flock -n 9 || exit 0
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read_static_host() {
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local name ip
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config_get name "$1" name
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config_get ip "$1" ip
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[ -n "$name" ] && [ "$name" != "*" ] && [ -n "$ip" ] && [ "$ip" != "ignore" ] || return
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printf '%s %s\n' "$ip" "$name"
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}
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# Static DHCP configuration only needs to be read once at startup.
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STATIC_HOSTS=$(
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config_load dhcp
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config_foreach read_static_host host
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)
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read_odhcpd_leases() {
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[ -f "$ODHCPD_LEASE_FILE" ] || return
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awk -v now="$(date +%s)" '
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function valid_name(name) {
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return name ~ /^[a-zA-Z0-9_][a-zA-Z0-9_.-]*$/
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}
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# State records: # interface DUID IAID hostname expiry assigned length address/prefix ...
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$1 == "#" {
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if (NF < 9 || !valid_name($5) || ($6 != -1 && $6 <= now))
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next
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# Only host addresses, never delegated IPv6 prefixes.
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if (!(($4 == "ipv4" && $8 == 32) || ($4 != "ipv4" && $8 == 128)))
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next
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for (i = 9; i <= NF; i++) {
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split($i, addr, "/")
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print addr[1] " " $5
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}
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next
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}
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# Older odhcpd versions also include hosts-format lines, with optional aliases.
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NF >= 2 && $1 ~ /^[0-9a-fA-F:.]+$/ {
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for (i = 2; i <= NF && $i !~ /^#/; i++)
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if (valid_name($i))
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print $1 " " $i
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}
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' "$ODHCPD_LEASE_FILE"
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}
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reload_dnsmasq_pids() {
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local pidfile pid
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find $TMP_PATH/acl -type f -name 'dnsmasq.pid' 2>/dev/null | while read pidfile; do
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if [ -s "$pidfile" ]; then
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read pid < "$pidfile"
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if [ -n "$pid" ] && kill -0 "$pid" 2>/dev/null; then
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kill -HUP "$pid"
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fi
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fi
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done
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}
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while true; do
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{
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[ -n "$STATIC_HOSTS" ] && printf '%s\n' "$STATIC_HOSTS"
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if [ -f "$DNSMASQ_LEASE_FILE" ]; then
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awk 'NF >= 4 && $4 != "*" {print $3" "$4}' "$DNSMASQ_LEASE_FILE"
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fi
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read_odhcpd_leases
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} | sort -u > "$TMP_FILE"
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if [ -s "$TMP_FILE" ]; then
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if [ ! -f "$HOSTS_FILE" ] || ! cmp -s "$TMP_FILE" "$HOSTS_FILE"; then
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mv "$TMP_FILE" "$HOSTS_FILE"
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reload_dnsmasq_pids
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else
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rm -f "$TMP_FILE"
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fi
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else
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if [ -s "$HOSTS_FILE" ]; then
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: > "$HOSTS_FILE"
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reload_dnsmasq_pids
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fi
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rm -f "$TMP_FILE"
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fi
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sleep 60 9>&-
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done 2>/dev/null
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