Add lab-01-trace-request

2026-09-22 17:32:15 +00:00
1 parent 576d56d39b
commit 101095d35a
@@ -0,0 +1,149 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+LAB_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
+REPO_ROOT="$(cd "$LAB_DIR/../.." && pwd)"
+
+source "$SCRIPT_DIR/config.sh"
+source "$REPO_ROOT/shared/minicorp/lib/minicorp.sh"
+source "$REPO_ROOT/shared/minicorp/topologies/client-router-server.sh"
+
+printf '\n'
+mc_log "Setting up $LAB_NAME"
+
+if [[ "$LAB_TOPOLOGY" != "client-router-server" ]]; then
+    mc_error "Unsupported topology: $LAB_TOPOLOGY"
+    exit 1
+fi
+
+# Verify the tools required by this lab.
+for command_name in python3 dnsmasq ss curl getent dig; do
+    mc_require_command "$command_name"
+done
+
+# Build the MiniCorp network from a known state.
+# Suppress topology details so setup does not reveal investigation answers.
+mc_log "Building MiniCorp virtual network"
+mc_topology_client_router_server_up >/dev/null
+
+# Verify the topology without exposing the investigation answers.
+if ! mc_topology_client_router_server_check >/dev/null; then
+    mc_error "MiniCorp topology validation failed."
+    exit 1
+fi
+
+# Remove stale service output from a previous run.
+sudo rm -f \
+    "$LAB_WEB_STDOUT" \
+    "$LAB_DNS_STDOUT"
+
+#
+# Web service
+#
+
+mc_log "Starting MiniCorp web service"
+
+sudo ip netns exec "$MC_SERVER_NS" env \
+    MINICORP_WEB_HOST="$MC_SERVER_ADDR" \
+    MINICORP_WEB_PORT="$LAB_WEB_PORT" \
+    python3 -u "$SCRIPT_DIR/web_server.py" \
+    >"$LAB_WEB_STDOUT" 2>&1 &
+
+web_ready=0
+
+for attempt in {1..20}; do
+    if mc_exec "$MC_SERVER_NS" ss -ltn |
+        grep -F "$MC_SERVER_ADDR:$LAB_WEB_PORT" >/dev/null
+    then
+        web_ready=1
+        break
+    fi
+
+    sleep 0.1
+done
+
+if [[ "$web_ready" -ne 1 ]]; then
+    mc_error "Web service failed to start."
+
+    if [[ -f "$LAB_WEB_STDOUT" ]]; then
+        cat "$LAB_WEB_STDOUT" >&2
+    fi
+
+    exit 1
+fi
+
+#
+# DNS service
+#
+
+mc_log "Starting MiniCorp DNS service"
+
+sudo ip netns exec "$MC_ROUTER_NS" dnsmasq \
+    --no-daemon \
+    --interface="$MC_ROUTER_CLIENT_IF" \
+    --listen-address="$MC_ROUTER_CLIENT_ADDR" \
+    --bind-interfaces \
+    --no-resolv \
+    --no-hosts \
+    --local=/minicorp.test/ \
+    --host-record="$LAB_WEB_HOSTNAME,$MC_SERVER_ADDR" \
+    --log-facility=- \
+    >"$LAB_DNS_STDOUT" 2>&1 &
+
+dns_ready=0
+
+for attempt in {1..20}; do
+    if mc_exec "$MC_ROUTER_NS" ss -lun |
+        grep -F "$MC_ROUTER_CLIENT_ADDR:53" >/dev/null
+    then
+        dns_ready=1
+        break
+    fi
+
+    sleep 0.1
+done
+
+if [[ "$dns_ready" -ne 1 ]]; then
+    mc_error "DNS service failed to start."
+
+    if [[ -f "$LAB_DNS_STDOUT" ]]; then
+        cat "$LAB_DNS_STDOUT" >&2
+    fi
+
+    exit 1
+fi
+
+#
+# Client resolver
+#
+
+mc_log "Configuring client DNS resolver"
+
+sudo mkdir -p "$LAB_CLIENT_RESOLV_DIR"
+
+printf 'nameserver %s\n' "$MC_ROUTER_CLIENT_ADDR" |
+    sudo tee "$LAB_CLIENT_RESOLV_CONF" >/dev/null
+
+#
+# Final health check
+#
+
+if ! mc_exec "$MC_CLIENT_NS" \
+    getent ahostsv4 "$LAB_WEB_HOSTNAME" >/dev/null
+then
+    mc_error "Client name resolution check failed."
+    exit 1
+fi
+
+if ! mc_exec "$MC_CLIENT_NS" \
+    curl --noproxy '*' -fsS \
+    "http://$LAB_WEB_HOSTNAME:$LAB_WEB_PORT/" >/dev/null
+then
+    mc_error "Client web request check failed."
+    exit 1
+fi
+
+printf '\n'
+mc_log "$LAB_NAME is ready."