#!/bin/sh
# bee-network.sh — bring up all physical network interfaces via DHCP
# Unattended: starts later in boot, runs quietly, and gives up after a bounded timeout.

LOG_PREFIX="bee-network"
DHCP_TIMEOUT_SECS=300

log() { echo "[$LOG_PREFIX] $*"; }

list_interfaces() {
    ip -o link show \
        | awk -F': ' '{print $2}' \
        | grep -v '^lo$' \
        | grep -vE '^(docker|virbr|veth|tun|tap|br-|bond|dummy)' \
        | sort
}

# Give udev a short chance to expose late NICs before the first scan.
if command -v udevadm >/dev/null 2>&1; then
    udevadm settle --timeout=5 >/dev/null 2>&1 || log "WARN: udevadm settle timed out"
fi

start_dhcp() {
    iface="$1"
    if ! ip link set "$iface" up; then
        log "WARN: could not bring up $iface"
        return 1
    fi

    carrier=$(cat "/sys/class/net/$iface/carrier" 2>/dev/null || true)
    if [ "$carrier" = "1" ]; then
        log "carrier detected on $iface"
    else
        log "carrier not detected on $iface"
    fi

    dhclient -r "$iface" >/dev/null 2>&1 || true

    if timeout "${DHCP_TIMEOUT_SECS}" dhclient -4 -q -1 "$iface" >/dev/null 2>&1; then
        addr="$(ip -4 -o addr show dev "$iface" scope global 2>/dev/null | awk '{print $4}' | head -1)"
        if [ -n "$addr" ]; then
            log "DHCP lease acquired on $iface ($addr)"
        else
            log "DHCP lease acquired on $iface"
        fi
        return 0
    fi

    rc=$?
    case "$rc" in
        124)
            log "DHCP timed out on $iface after ${DHCP_TIMEOUT_SECS}s"
            ;;
        *)
            log "DHCP failed on $iface (exit $rc)"
            ;;
    esac
    dhclient -r "$iface" >/dev/null 2>&1 || true
    return 1
}

started_ifaces=""
started_count=0
scan_pass=1
pids=""
pid_ifaces=""

# Some server NICs appear a bit later after module/firmware init. Do a small
# bounded rescan window without turning network bring-up into a boot blocker.
while [ "$scan_pass" -le 3 ]; do
    interfaces=$(list_interfaces)

    if [ -n "$interfaces" ]; then
        for iface in $interfaces; do
            case " $started_ifaces " in
                *" $iface "*) continue ;;
            esac

            log "starting DHCP on $iface (timeout ${DHCP_TIMEOUT_SECS}s)"
            start_dhcp "$iface" &
            pid="$!"
            pids="$pids $pid"
            pid_ifaces="$pid_ifaces $pid:$iface"

            started_ifaces="$started_ifaces $iface"
            started_count=$((started_count + 1))
        done
    fi

    if [ "$scan_pass" -ge 3 ]; then
        break
    fi
    scan_pass=$((scan_pass + 1))
    sleep 2
done

if [ "$started_count" -eq 0 ]; then
    log "no physical interfaces found"
    exit 0
fi

success_count=0
for pid_iface in $pid_ifaces; do
    pid="${pid_iface%%:*}"
    iface="${pid_iface#*:}"
    if wait "$pid"; then
        success_count=$((success_count + 1))
    else
        log "DHCP did not complete successfully on $iface"
    fi
done

log "done (interfaces scanned: $started_count, leases acquired: $success_count)"