bastion: discover-first PXE provisioning with multi-arch support

Rewrote bastion from install-only to discover-first flow: - Default mode discovers hardware (PXE boot → inventory → poweroff) - Discovered machines promoted to install via subcommand - Per-MAC iPXE dispatch (/dispatch?mac=) routes discover vs install - Python HTTP server with discovery API, state management, kickstart gen - Added full DHCP mode (DHCP_MODE=full) for isolated/test networks - Added arm64 UEFI support (client-arch 11, iPXE arm64 binary) - Added QEMU test script (aarch64+KVM on Asahi Linux) - All API endpoints unit tested and working Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-16 00:06:04 +00:00
parent 5ba22b94ea
commit 2a429088c5
2 changed files with 272 additions and 8 deletions
--- a/bastion.sh
+++ b/bastion.sh
@@ -27,6 +27,9 @@ HTTP_PORT="${HTTP_PORT:-8080}"
 TIMEZONE="${TIMEZONE:-Europe/London}"
 LOCALE="${LOCALE:-en_GB.UTF-8}"
 BASTION_DIR="${BASTION_DIR:-/tmp/lab-bastion}"
+DHCP_MODE="${DHCP_MODE:-proxy}"        # proxy (alongside existing DHCP) or full (bastion IS the DHCP server)
+DHCP_RANGE_START="${DHCP_RANGE_START:-}"  # only for full mode, auto-derived if empty
+DHCP_RANGE_END="${DHCP_RANGE_END:-}"

 # ──── Colors ──────────────────────────────────────────────────────
 RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'
@@ -200,7 +203,8 @@ FEDORA_MIRROR="https://download.fedoraproject.org/pub/fedora/linux/releases/${FE

 log "Fetching boot artifacts (Fedora ${FEDORA_VERSION} ${ARCH})..."
 download "https://boot.ipxe.org/undionly.kpxe"            "$TFTPDIR/undionly.kpxe"      "iPXE BIOS"
-download "https://boot.ipxe.org/ipxe.efi"        "$TFTPDIR/ipxe.efi"        "iPXE UEFI"
+download "https://boot.ipxe.org/ipxe.efi"                 "$TFTPDIR/ipxe.efi"           "iPXE UEFI x86_64"
+download "https://boot.ipxe.org/arm64-efi/snponly.efi"    "$TFTPDIR/ipxe-arm64.efi"     "iPXE UEFI arm64"
 download "${FEDORA_MIRROR}/images/pxeboot/vmlinuz"        "$HTTPDIR/vmlinuz"             "Fedora kernel"
 download "${FEDORA_MIRROR}/images/pxeboot/initrd.img"     "$HTTPDIR/initrd.img"          "Fedora initrd"

@@ -652,9 +656,15 @@ if __name__ == "__main__":
 PYSERVER

 # ──── Generate dnsmasq config ─────────────────────────────────────
+# ──── Generate dnsmasq config ─────────────────────────────────────
+# Derive DHCP range for full mode
+if [[ "$DHCP_MODE" == "full" ]]; then
+    DHCP_RANGE_START="${DHCP_RANGE_START:-${NETWORK%.*}.100}"
+    DHCP_RANGE_END="${DHCP_RANGE_END:-${NETWORK%.*}.200}"
+fi
+
 cat > "$BASTION_DIR/dnsmasq.conf" << DNSMASQ
 # Lab PXE Bastion — dnsmasq config
-# ProxyDHCP mode: adds PXE options without replacing existing DHCP

 # Disable DNS (we only want DHCP/TFTP)
 port=0
@@ -663,8 +673,17 @@ port=0
 interface=${IFACE}
 bind-interfaces

+$(if [[ "$DHCP_MODE" == "full" ]]; then
+cat << FULL_DHCP
+# Full DHCP mode — bastion is the only DHCP server on this network
+dhcp-range=${DHCP_RANGE_START},${DHCP_RANGE_END},255.255.255.0,12h
+FULL_DHCP
+else
+cat << PROXY_DHCP
 # ProxyDHCP — works alongside existing DHCP (UniFi etc)
 dhcp-range=${NETWORK},proxy
+PROXY_DHCP
+fi)

 # TFTP for initial PXE boot
 enable-tftp
@@ -672,15 +691,17 @@ tftp-root=${TFTPDIR}

 # Detect client architecture
 dhcp-match=set:bios,option:client-arch,0
-dhcp-match=set:efi64,option:client-arch,7
-dhcp-match=set:efi64,option:client-arch,9
+dhcp-match=set:efi-x86_64,option:client-arch,7
+dhcp-match=set:efi-x86_64,option:client-arch,9
+dhcp-match=set:efi-arm64,option:client-arch,11

 # Detect iPXE clients (already chainloaded)
 dhcp-userclass=set:ipxe,iPXE

 # First PXE boot → serve iPXE binary via TFTP
 dhcp-boot=tag:bios,tag:!ipxe,undionly.kpxe
-dhcp-boot=tag:efi64,tag:!ipxe,ipxe.efi
+dhcp-boot=tag:efi-x86_64,tag:!ipxe,ipxe.efi
+dhcp-boot=tag:efi-arm64,tag:!ipxe,ipxe-arm64.efi

 # iPXE clients → chain to boot script via HTTP
 dhcp-boot=tag:ipxe,http://${SERVER_IP}:${HTTP_PORT}/boot.ipxe
@@ -732,6 +753,7 @@ echo -e "${CYAN}${BOLD}  Lab PXE Bastion — Discovery Mode${NC}"
 echo -e "${CYAN}${BOLD}════════════════════════════════════════════════════════════${NC}"
 echo ""
 echo -e "  Network:   ${BOLD}${NETWORK}/24${NC} via ${BOLD}${IFACE}${NC}"
+echo -e "  DHCP:      ${BOLD}${DHCP_MODE}${NC}$(if [[ "$DHCP_MODE" == "full" ]]; then echo " (${DHCP_RANGE_START}–${DHCP_RANGE_END})"; else echo " (alongside existing DHCP)"; fi)"
 echo -e "  HTTP:      ${BOLD}http://${SERVER_IP}:${HTTP_PORT}/${NC}"
 echo -e "  OS:        ${BOLD}Fedora ${FEDORA_VERSION} (${ARCH})${NC}"
 echo -e "  State:     ${BOLD}${STATEFILE}${NC}"
--- a/test-bastion.sh
+++ b/test-bastion.sh
@@ -0,0 +1,242 @@
+#!/usr/bin/env bash
+# ─────────────────────────────────────────────────────────────────────
+# test-bastion.sh — End-to-end test of PXE bastion using QEMU
+#
+# Creates an isolated virtual network, starts the bastion in full DHCP
+# mode, and PXE boots a QEMU VM to test the discovery flow.
+#
+# Uses aarch64 + KVM on Apple Silicon for near-native speed.
+#
+# Usage:
+#   sudo bash test-bastion.sh              # discover test (default)
+#   sudo bash test-bastion.sh --install    # discover + install test
+#   sudo bash test-bastion.sh --cleanup    # remove test artifacts
+#
+# Requirements: qemu-system-aarch64, edk2-aarch64, dnsmasq, python3
+# ─────────────────────────────────────────────────────────────────────
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+MODE="${1:---discover}"
+
+# Virtual network config
+BRIDGE="lab-br0"
+TAP="lab-tap0"
+BRIDGE_IP="10.99.0.1"
+BRIDGE_CIDR="${BRIDGE_IP}/24"
+BRIDGE_NET="10.99.0.0"
+
+# Test dir
+TEST_DIR="/tmp/lab-bastion-test"
+BASTION_LOG="$TEST_DIR/bastion.log"
+DISK="$TEST_DIR/test-disk.qcow2"
+OVMF_CODE="/usr/share/edk2/aarch64/QEMU_EFI-pflash.raw"
+OVMF_VARS_TEMPLATE="/usr/share/AAVMF/AAVMF_VARS.fd"
+OVMF_VARS="$TEST_DIR/AAVMF_VARS.fd"
+
+# Colors
+RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'
+CYAN='\033[0;36m'; BOLD='\033[1m'; NC='\033[0m'
+
+log()  { echo -e "${GREEN}[test]${NC} $*"; }
+warn() { echo -e "${YELLOW}[test]${NC} $*"; }
+die()  { echo -e "${RED}[test]${NC} $*" >&2; exit 1; }
+
+# ──── Cleanup subcommand ──────────────────────────────────────────
+if [[ "$MODE" == "--cleanup" ]]; then
+    echo "Cleaning up test artifacts..."
+    ip link del "$TAP"    2>/dev/null || true
+    ip link del "$BRIDGE" 2>/dev/null || true
+    rm -rf "$TEST_DIR"
+    echo "Done."
+    exit 0
+fi
+
+# ──── Preflight ───────────────────────────────────────────────────
+[[ $EUID -eq 0 ]] || die "Run as root: sudo bash test-bastion.sh"
+
+MISSING=""
+command -v qemu-system-aarch64 >/dev/null || MISSING="$MISSING qemu-system-aarch64"
+command -v qemu-img            >/dev/null || MISSING="$MISSING qemu-img"
+command -v dnsmasq             >/dev/null || MISSING="$MISSING dnsmasq"
+command -v python3             >/dev/null || MISSING="$MISSING python3"
+command -v curl                >/dev/null || MISSING="$MISSING curl"
+
+[[ -z "$MISSING" ]] || die "Missing:$MISSING\n  Install with: sudo dnf install$MISSING"
+[[ -f "$OVMF_CODE" ]] || die "UEFI firmware not found: $OVMF_CODE\n  Install with: sudo dnf install edk2-aarch64"
+[[ -e /dev/kvm ]] || die "/dev/kvm not available — KVM required for aarch64 testing"
+
+mkdir -p "$TEST_DIR"
+
+# ──── Cleanup handler ─────────────────────────────────────────────
+BASTION_PID=""
+TAIL_PID=""
+
+cleanup() {
+    echo ""
+    log "Cleaning up..."
+    [[ -n "$TAIL_PID" ]]    && kill "$TAIL_PID"    2>/dev/null || true
+    [[ -n "$BASTION_PID" ]] && kill "$BASTION_PID"  2>/dev/null || true
+    sleep 1
+    ip link set "$TAP" down     2>/dev/null || true
+    ip link del "$TAP"          2>/dev/null || true
+    ip link set "$BRIDGE" down  2>/dev/null || true
+    ip link del "$BRIDGE"       2>/dev/null || true
+    log "Done. Logs: $BASTION_LOG  State: $TEST_DIR/bastion/state.json"
+}
+trap cleanup EXIT INT TERM
+
+# ──── Create isolated virtual network ─────────────────────────────
+log "Creating virtual network ${BOLD}${BRIDGE_NET}/24${NC} ..."
+
+# Clean up leftovers from previous runs
+ip link del "$TAP"    2>/dev/null || true
+ip link del "$BRIDGE" 2>/dev/null || true
+
+ip link add "$BRIDGE" type bridge
+ip addr add "$BRIDGE_CIDR" dev "$BRIDGE"
+ip link set "$BRIDGE" up
+
+ip tuntap add dev "$TAP" mode tap
+ip link set "$TAP" master "$BRIDGE"
+ip link set "$TAP" up
+
+log "Bridge ${BOLD}$BRIDGE${NC} at ${BOLD}$BRIDGE_IP${NC}, tap ${BOLD}$TAP${NC}"
+
+# ──── Start bastion ───────────────────────────────────────────────
+log "Starting bastion (full DHCP mode, aarch64)..."
+
+# Override ARCH to aarch64 for the test VM
+IFACE="$BRIDGE" \
+DHCP_MODE="full" \
+ARCH="aarch64" \
+BASTION_DIR="$TEST_DIR/bastion" \
+HTTP_PORT=8080 \
+    bash "$SCRIPT_DIR/bastion.sh" serve > "$BASTION_LOG" 2>&1 &
+BASTION_PID=$!
+
+# Tail bastion output
+sleep 1
+tail -f "$BASTION_LOG" --pid=$BASTION_PID 2>/dev/null &
+TAIL_PID=$!
+
+# Wait for bastion HTTP to be ready
+log "Waiting for bastion to start..."
+READY=false
+for i in $(seq 1 60); do
+    if curl -sf "http://${BRIDGE_IP}:8080/boot.ipxe" >/dev/null 2>&1; then
+        READY=true
+        break
+    fi
+    if ! kill -0 "$BASTION_PID" 2>/dev/null; then
+        echo ""
+        log "Bastion failed to start. Last 20 lines:"
+        tail -20 "$BASTION_LOG"
+        die "Bastion exited unexpectedly"
+    fi
+    sleep 1
+done
+
+$READY || die "Bastion HTTP not responding after 60s"
+log "Bastion is ready!"
+
+# ──── Prepare UEFI vars and disk ──────────────────────────────────
+if [[ ! -f "$OVMF_VARS" ]]; then
+    cp "$OVMF_VARS_TEMPLATE" "$OVMF_VARS"
+fi
+
+if [[ ! -f "$DISK" ]]; then
+    log "Creating 20G test disk..."
+    qemu-img create -f qcow2 "$DISK" 20G >/dev/null
+fi
+
+# ──── Boot QEMU VM ────────────────────────────────────────────────
+echo ""
+log "${BOLD}Booting QEMU VM (aarch64 + KVM — PXE network boot)${NC}"
+log "UEFI firmware will attempt PXE boot automatically."
+log "Watch for ${BOLD}'NEW MACHINE DISCOVERED'${NC} in bastion output."
+echo ""
+echo -e "${CYAN}──── QEMU console ────${NC}"
+echo ""
+
+# aarch64 UEFI PXE boot with KVM acceleration
+# - virtio-net-pci for networking (UEFI has PXE driver)
+# - pflash for UEFI firmware (code + vars)
+# - no disk boot priority → falls through to PXE
+qemu-system-aarch64 \
+    -machine virt,gic-version=3 \
+    -cpu host \
+    --enable-kvm \
+    -m 2048 \
+    -smp 2 \
+    -drive if=pflash,format=raw,readonly=on,file="$OVMF_CODE" \
+    -drive if=pflash,format=raw,file="$OVMF_VARS" \
+    -drive if=virtio,format=qcow2,file="$DISK" \
+    -netdev tap,id=net0,ifname="$TAP",script=no,downscript=no \
+    -device virtio-net-pci,netdev=net0 \
+    -boot n \
+    -nographic
+
+# ──── Post-test ───────────────────────────────────────────────────
+echo ""
+log "QEMU exited. Checking bastion state..."
+
+STATE=$(curl -sf "http://${BRIDGE_IP}:8080/api/machines" 2>/dev/null || echo '{}')
+DISCOVERED=$(echo "$STATE" | python3 -c "
+import sys, json
+state = json.load(sys.stdin)
+print(len(state.get('discovered', {})))
+" 2>/dev/null || echo "0")
+
+echo ""
+if [[ "$DISCOVERED" -gt 0 ]]; then
+    log "${GREEN}${BOLD}SUCCESS — $DISCOVERED machine(s) discovered!${NC}"
+    HTTP_PORT=8080 bash "$SCRIPT_DIR/bastion.sh" list 2>/dev/null || \
+        echo "$STATE" | python3 -m json.tool
+else
+    warn "No machines discovered. Check bastion log: $BASTION_LOG"
+fi
+
+# ──── Install phase (if requested) ────────────────────────────────
+if [[ "$MODE" == "--install" && "$DISCOVERED" -gt 0 ]]; then
+    MAC=$(echo "$STATE" | python3 -c "
+import sys, json
+state = json.load(sys.stdin)
+print(list(state.get('discovered', {}).keys())[0])
+" 2>/dev/null)
+
+    if [[ -n "$MAC" ]]; then
+        echo ""
+        log "Install mode: queuing ${BOLD}$MAC${NC} as ${BOLD}test-node${NC}..."
+        HTTP_PORT=8080 bash "$SCRIPT_DIR/bastion.sh" install "$MAC" test-node
+
+        # Reset UEFI vars so it PXE boots again (not from disk)
+        cp "$OVMF_VARS_TEMPLATE" "$OVMF_VARS"
+
+        echo ""
+        log "Re-booting QEMU for install phase..."
+        echo ""
+        echo -e "${CYAN}──── QEMU console (install phase) ────${NC}"
+        echo ""
+
+        qemu-system-aarch64 \
+            -machine virt,gic-version=3 \
+            -cpu host \
+            --enable-kvm \
+            -m 2048 \
+            -smp 2 \
+            -drive if=pflash,format=raw,readonly=on,file="$OVMF_CODE" \
+            -drive if=pflash,format=raw,file="$OVMF_VARS" \
+            -drive if=virtio,format=qcow2,file="$DISK" \
+            -netdev tap,id=net0,ifname="$TAP",script=no,downscript=no \
+            -device virtio-net-pci,netdev=net0 \
+            -boot n \
+            -nographic
+
+        echo ""
+        log "Install phase complete."
+    fi
+fi
+
+echo ""
+log "Test finished."