Add WASM sandbox, bench harness, and cache CDB at startup
Jaime Fournier <jaimef@linbsd.org>
94c84a634b09d4a2bcaabd0f92dedcda443d0e63
diff --git a/.gitignore b/.gitignore
index 42ca438..3b309bd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,7 @@
*.so
*.wpo
-# CDB data files
+# CDB data files (generated from .data via bench/gen-zone.sh)
*.cdb
# Static build artifacts
@@ -12,3 +12,13 @@ static/*.h
static/jdns
static/jdns-data
static/jdns-debug
+
+# Bench logs and server-stderr dumps (large, regenerable)
+bench/logs/
+bench/results/**/*-server.log
+bench/results/**/*-server.log.pid
+bench/results/**/*.pid
+
+# Rust wasm build artifacts (the lib/jerboa-dns/sandbox/*.wasm outputs
+# are committed; the intermediate target/ dir is not)
+wasm/target/
diff --git a/Makefile b/Makefile
index 0e79aea..183c050 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,15 @@ SCHEME ?= $(JERBOA_HOME)/.chez/bin/scheme
JERBOA ?= $(JERBOA_HOME)/lib
LIBDIRS = lib:$(JERBOA)
-.PHONY: all build test clean jdns jdns-data
+WASM_DIR = wasm
+WASM_DNS_OUT = lib/jerboa-dns/sandbox/dns_parser.wasm
+WASM_CDB_OUT = lib/jerboa-dns/sandbox/cdb_parser.wasm
+WASM_OUTPUTS = $(WASM_DNS_OUT) $(WASM_CDB_OUT)
+WASM_SOURCES = $(WASM_DIR)/Cargo.toml \
+ $(WASM_DIR)/dns/Cargo.toml $(WASM_DIR)/dns/src/lib.rs \
+ $(WASM_DIR)/cdb/Cargo.toml $(WASM_DIR)/cdb/src/lib.rs
+
+.PHONY: all build test clean jdns jdns-data wasm wasm-clean
all: build
@@ -11,6 +19,16 @@ build:
@echo "Compiling jerboa-dns libraries..."
@$(SCHEME) --libdirs "$(LIBDIRS)" --compile-imported-libraries --script build.ss
+# Build the sandboxed DNS parser and CDB lookup engine as WebAssembly
+# modules. Requires rustup with the wasm32-unknown-unknown target installed.
+wasm: $(WASM_OUTPUTS)
+
+$(WASM_OUTPUTS): $(WASM_SOURCES)
+ @$(WASM_DIR)/build.sh
+
+wasm-clean:
+ rm -rf $(WASM_DIR)/target $(WASM_OUTPUTS)
+
jdns: build
$(SCHEME) --libdirs "$(LIBDIRS)" --script bin/jdns.ss
@@ -19,8 +37,14 @@ jdns-data: build
test: build
@echo "Running tests..."
+ @# macOS strips DYLD_LIBRARY_PATH through sh; DYLD_FALLBACK_LIBRARY_PATH
+ @# is preserved and works for finding libjerboa_native.dylib so the
+ @# wasm sandbox tests can exercise the sandbox path. On Linux/BSD,
+ @# LD_LIBRARY_PATH is honored normally.
@for f in tests/*-test.ss; do \
echo " $$f"; \
+ DYLD_FALLBACK_LIBRARY_PATH="$(JERBOA)" \
+ LD_LIBRARY_PATH="$(JERBOA):$$LD_LIBRARY_PATH" \
$(SCHEME) --libdirs "$(LIBDIRS)" --script "$$f" || exit 1; \
done
@echo "All tests passed."
diff --git a/bench/gen-queries.sh b/bench/gen-queries.sh
new file mode 100755
index 0000000..4a743ad
--- /dev/null
+++ b/bench/gen-queries.sh
@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+# Generate dnsperf-format query files.
+#
+# Usage: bench/gen-queries.sh <max-host-index>
+# Produces (in bench/queries/):
+# hot.txt — A queries against host-1..N (all should hit)
+# nxdomain.txt — A queries against names that don't exist (still inside
+# the zone, so the server walks the auth chain)
+# wildcard.txt — A queries against names matched by *.bench.local
+# mixed.txt — 70% hot, 15% wildcard, 15% nxdomain
+#
+# Each line is "QNAME QTYPE" — dnsperf's input format.
+
+set -euo pipefail
+
+N="${1:-1000}"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+QDIR="$ROOT/bench/queries"
+
+mkdir -p "$QDIR"
+
+# 1) hot: 5 × N queries cycling through host-1..N, A
+{
+ for r in 1 2 3 4 5; do
+ for i in $(seq 1 "$N"); do
+ echo "host-${i}.bench.local A"
+ done
+ done
+} > "$QDIR/hot.txt"
+
+# 2) nxdomain: names with no exact match but inside the auth chain.
+# Use a label not used as wildcard target and not present as A.
+{
+ for r in 1 2 3 4 5; do
+ for i in $(seq 1 "$N"); do
+ echo "nx-${i}.bench.local A"
+ done
+ done
+} > "$QDIR/nxdomain.txt"
+
+# 3) wildcard: names that don't exist as exact records but DO match the
+# *.bench.local wildcard.
+{
+ for r in 1 2 3 4 5; do
+ for i in $(seq 1 "$N"); do
+ echo "wild-${i}.wild.bench.local A"
+ done
+ done
+} > "$QDIR/wildcard.txt"
+
+# 4) mixed: 70/15/15 hot/wild/nx — shuffled deterministically (sort -R
+# on macOS uses /dev/urandom; reproducible enough for our purposes).
+{
+ for r in 1 2 3 4 5 6 7; do
+ for i in $(seq 1 "$N"); do echo "host-${i}.bench.local A"; done
+ done
+ for r in 1 2; do
+ for i in $(seq 1 "$N"); do echo "wild-${i}.wild.bench.local A"; done
+ done
+ for r in 1 2; do
+ for i in $(seq 1 "$N"); do echo "nx-${i}.bench.local A"; done
+ done
+} | awk 'BEGIN{srand(42)} {print rand()"\t"$0}' | sort -k1,1n | cut -f2- > "$QDIR/mixed.txt"
+
+for f in hot.txt nxdomain.txt wildcard.txt mixed.txt; do
+ echo "$QDIR/$f: $(wc -l < "$QDIR/$f") queries"
+done
diff --git a/bench/gen-zone.sh b/bench/gen-zone.sh
new file mode 100755
index 0000000..f9368da
--- /dev/null
+++ b/bench/gen-zone.sh
@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+# Generate a tinydns-data zone for benchmarking.
+#
+# Usage: bench/gen-zone.sh <record-count>
+# Produces:
+# bench/zones/zone-<N>.data — tinydns-data source
+# bench/zones/zone-<N>.cdb — compiled CDB
+#
+# Zone layout:
+# bench.local — apex (SOA + NS)
+# *.bench.local — wildcard A
+# host-1.bench.local
+# ...
+# host-<N>.bench.local — A records
+# mx.bench.local — A used by MX
+# aaaa-1..N/10.bench.local — AAAA records (10% of N)
+# www.bench.local — CNAME → host-1.bench.local
+
+set -euo pipefail
+
+N="${1:-1000}"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+ZONES_DIR="$ROOT/bench/zones"
+
+DATA="$ZONES_DIR/zone-${N}.data"
+CDB="$ZONES_DIR/zone-${N}.cdb"
+
+mkdir -p "$ZONES_DIR"
+
+{
+ # Apex SOA + NS + glue
+ echo ".bench.local:10.0.0.1:ns1.bench.local:259200"
+ echo "&bench.local:10.0.0.2:ns2.bench.local:259200"
+ # MX + glue
+ echo "@bench.local:10.0.0.3:mx.bench.local:10:86400"
+ # CNAME
+ echo "Cwww.bench.local:host-1.bench.local:86400"
+ # Wildcard — confined to wild.bench.local so queries under the apex
+ # without an exact match cleanly return NXDOMAIN.
+ echo "+*.wild.bench.local:10.99.99.99:86400"
+
+ # Bulk A records
+ for i in $(seq 1 "$N"); do
+ # Spread across an /8 to avoid the same rdata for every host
+ a=$(( i / 65536 % 256 ))
+ b=$(( i / 256 % 256 ))
+ c=$(( i % 256 ))
+ echo "+host-${i}.bench.local:10.${a}.${b}.${c}:86400"
+ done
+
+ # AAAA records — 10% of N (rounded up, ≥1)
+ aaaa=$(( (N + 9) / 10 ))
+ for i in $(seq 1 "$aaaa"); do
+ # IPv6 32-hex: 2001:db8:0000:...:<i hex padded to 8>
+ h=$(printf "%08x" "$i")
+ echo "3aaaa-${i}.bench.local:20010db8000000000000000000${h}:86400"
+ done
+} > "$DATA"
+
+echo "Wrote $DATA ($(wc -l < "$DATA") lines)"
+
+# Compile via jdns-data. Needs JERBOA stdlib's native libs on the
+# loader path so the server.sls socket FFI bindings resolve at import.
+cd "$ROOT"
+echo "Compiling $DATA -> $CDB ..."
+DYLD_FALLBACK_LIBRARY_PATH="$HOME/mine/jerboa/lib" \
+LD_LIBRARY_PATH="$HOME/mine/jerboa/lib:${LD_LIBRARY_PATH:-}" \
+$HOME/mine/jerboa/.chez/bin/scheme \
+ --libdirs "lib:$HOME/mine/jerboa/lib" \
+ --script bin/jdns-data.ss "$DATA" "$CDB" 2>&1 | tail -3
+echo "CDB size: $(wc -c < "$CDB") bytes"
diff --git a/bench/percentiles.awk b/bench/percentiles.awk
new file mode 100644
index 0000000..a205b0e
--- /dev/null
+++ b/bench/percentiles.awk
@@ -0,0 +1,30 @@
+#!/usr/bin/awk -f
+# Extract latency percentiles from a dnsperf -O latency-histogram output.
+# Usage: awk -f percentiles.awk <dnsperf-output.txt>
+
+/^ +[0-9].*:.*[0-9]+$/ {
+ sub(/^ +/, "")
+ split($0, parts, ":")
+ split(parts[1], r, "-")
+ lat = (r[1] + r[2]) / 2.0
+ cnt = parts[2] + 0
+ n++
+ buckets[n] = lat
+ counts[n] = cnt
+ total += cnt
+}
+
+END {
+ if (total == 0) { print "no samples"; exit }
+ p50 = total * 0.50; p95 = total * 0.95
+ p99 = total * 0.99; p999 = total * 0.999
+ cum = 0
+ for (i = 1; i <= n; i++) {
+ cum += counts[i]
+ if (!s50 && cum >= p50) { v50 = buckets[i]; s50 = 1 }
+ if (!s95 && cum >= p95) { v95 = buckets[i]; s95 = 1 }
+ if (!s99 && cum >= p99) { v99 = buckets[i]; s99 = 1 }
+ if (!s999 && cum >= p999) { v999 = buckets[i]; s999 = 1 }
+ }
+ printf "p50=%.6f p95=%.6f p99=%.6f p99.9=%.6f n=%d\n", v50, v95, v99, v999, total
+}
diff --git a/bench/queries/hot.txt b/bench/queries/hot.txt
new file mode 100644
index 0000000..d727ce9
--- /dev/null
+++ b/bench/queries/hot.txt
@@ -0,0 +1,5000 @@
+host-1.bench.local A
+host-2.bench.local A
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