router: add BIRD2 config auto-generation from per-list tables

router/route-update.sh

@@ -17,6 +17,9 @@ ROUTES6_DIR=routes6.d
 STATE_DIR=.state
 HISTORY_SIZE=10
 
+BIRD_AS=65000
+BIRD_CONF="/etc/bird/route-tables.conf"
+
 FORCE=
 RESOLVE=
 SHOW=
@@ -661,6 +664,98 @@ cleanup_state()
     done
 }
 
+# --- Generate BIRD2 config for BGP route distribution ---
+# Creates /etc/bird/route-tables.conf with protocol kernel blocks
+# for each per-list routing table, tagged with BGP community = table number.
+# Only runs if birdc is installed.
+generate_bird_config()
+{
+    command -v birdc >/dev/null 2>&1 || return 0
+
+    local tmp_conf=$(mktemp)
+    local seen=""
+
+    echo "# Auto-generated by route-update.sh — do not edit" > "$tmp_conf"
+
+    # IPv4 tables: each gets own BIRD table + pipe to master4
+    for state_dir in "$STATE_DIR/$ROUTES_DIR"/*/*/ ; do
+        [ -d "$state_dir" ] || continue
+        [ -f "$state_dir/table" ] || continue
+        local name=$(basename "$state_dir")
+        # Skip duplicates (same list in multiple groups shares table)
+        echo "$seen" | grep -q " ${name}4 " && continue
+        seen="$seen ${name}4 "
+        local table_num
+        read -r table_num < "$state_dir/table"
+        cat >> "$tmp_conf" <<EOF
+
+ipv4 table t_${name}4;
+
+protocol kernel k_${name}4 {
+    ipv4 { table t_${name}4; import filter { bgp_community.add(($BIRD_AS, $table_num)); accept; }; export none; };
+    kernel table $table_num;
+    scan time 30;
+    learn;
+}
+
+protocol pipe p_${name}4 {
+    table master4;
+    peer table t_${name}4;
+    import all;
+    export none;
+}
+EOF
+    done
+
+    # IPv6 tables: each gets own BIRD table + pipe to master6
+    for state_dir in "$STATE_DIR/$ROUTES6_DIR"/*/*/ ; do
+        [ -d "$state_dir" ] || continue
+        [ -f "$state_dir/table" ] || continue
+        local name=$(basename "$state_dir")
+        echo "$seen" | grep -q " ${name}6 " && continue
+        seen="$seen ${name}6 "
+        local table_num
+        read -r table_num < "$state_dir/table"
+        cat >> "$tmp_conf" <<EOF
+
+ipv6 table t_${name}6;
+
+protocol kernel k_${name}6 {
+    ipv6 { table t_${name}6; import filter { bgp_community.add(($BIRD_AS, $table_num)); accept; }; export none; };
+    kernel table $table_num;
+    scan time 30;
+    learn;
+}
+
+protocol pipe p_${name}6 {
+    table master6;
+    peer table t_${name}6;
+    import all;
+    export none;
+}
+EOF
+    done
+
+    if [ -n "$SHOW" ] ; then
+        log "Generated BIRD config ($BIRD_CONF):"
+        cat "$tmp_conf" >&2
+        rm -f "$tmp_conf"
+        return 0
+    fi
+
+    # Compare and replace only if changed
+    if [ -f "$BIRD_CONF" ] && diff -q "$tmp_conf" "$BIRD_CONF" >/dev/null 2>&1 ; then
+        vlog "BIRD config unchanged"
+        rm -f "$tmp_conf"
+        return 0
+    fi
+
+    mv "$tmp_conf" "$BIRD_CONF"
+    chmod 644 "$BIRD_CONF"
+    log "BIRD config updated: $BIRD_CONF"
+    birdc configure >/dev/null 2>&1 && log "BIRD reconfigured" || log "WARNING: birdc configure failed"
+}
+
 # --- Main ---
 [ -n "$SHOW" ] && log "Dry-run mode (no changes will be made)"
 [ -n "$VERBOSE" ] && log "Verbose mode, state_dir=$STATE_DIR"
@@ -671,5 +766,6 @@ check_extra_dns
 process_routes "$ROUTES_DIR" get_ipv4_list_bulk "ip" ""
 process_routes "$ROUTES6_DIR" get_ipv6_list_bulk "ip -6" " (v6)"
 cleanup_state
+generate_bird_config
 
 [ -n "$SHOW" ] || log "All done"