Add fuzzing infrastructure for improved security testing

- Initialize cargo-fuzz with 5 fuzz targets
- Target critical protocol parsing areas (MySQL, PostgreSQL)
- Focus on RUSTSEC-2024-0363 vulnerability area
- Add fuzzing helper scripts for development
- Configure workspace to exclude fuzz directory

Fuzzing targets:
- fuzz_mysql_lenenc: MySQL length-encoded integer parsing
- fuzz_mysql_row_binary: Binary protocol row parsing
- fuzz_mysql_handshake: Connection handshake parsing
- fuzz_postgres_data_row: PostgreSQL data row parsing
- fuzz_postgres_response: Error/notice response parsing

This infrastructure enables continuous fuzzing to discover
security vulnerabilities and protocol misinterpretation issues.

Contributed by: Jared Reyes

Author: jrey8343

Cargo.toml

@@ -25,6 +25,7 @@ members = [
     "examples/sqlite/todos",
     "examples/sqlite/extension",
 ]
+exclude = ["fuzz"]
 
 [workspace.package]
 version = "0.9.0-alpha.1"

check_fuzzing_status.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+LOG_DIR="$SCRIPT_DIR/fuzz_logs"
+
+echo "🔍 Fuzzing Status Check"
+echo "======================="
+echo ""
+
+TARGETS=(
+    "fuzz_arg_parser"
+    "fuzz_shell_completion"
+    "fuzz_help_generator"
+    "fuzz_value_parser"
+    "fuzz_subcommand_parser"
+    "fuzz_env_parser"
+)
+
+RUNNING_COUNT=0
+for TARGET in "${TARGETS[@]}"; do
+    PID=$(pgrep -f "cargo-fuzz.*$TARGET" || true)
+    if [ -n "$PID" ]; then
+        echo "✅ Fuzzer $((++RUNNING_COUNT)) (PID $PID): RUNNING"
+    else
+        echo "❌ Fuzzer for $TARGET: NOT RUNNING"
+    fi
+done
+
+echo ""
+echo "Summary: $RUNNING_COUNT/6 fuzzers running"
+echo ""
+
+echo "📊 Latest Stats:"
+echo "==============="
+echo ""
+
+for TARGET in "${TARGETS[@]}"; do
+    LOG_FILE=$(ls -t "$LOG_DIR/${TARGET}_"*.log 2>/dev/null | head -1)
+    if [ -n "$LOG_FILE" ] && [ -f "$LOG_FILE" ]; then
+        echo "$TARGET:"
+        tail -100 "$LOG_FILE" | grep "^#" | tail -3 || echo "  No stats yet"
+        echo ""
+    fi
+done
+
+echo "💥 Crashes Found:"
+echo "================="
+
+CRASH_DIR="$SCRIPT_DIR/fuzz/artifacts"
+if [ -d "$CRASH_DIR" ]; then
+    CRASH_COUNT=$(find "$CRASH_DIR" -type f -name "crash-*" -o -name "leak-*" -o -name "timeout-*" 2>/dev/null | wc -l | tr -d ' ')
+    if [ "$CRASH_COUNT" -gt 0 ]; then
+        echo "  Found $CRASH_COUNT crash(es)!"
+        find "$CRASH_DIR" -type f \( -name "crash-*" -o -name "leak-*" -o -name "timeout-*" \) 2>/dev/null
+    else
+        echo "  None found yet (keep running!)"
+    fi
+else
+    echo "  None found yet (keep running!)"
+fi

fuzz/.gitignore

@@ -0,0 +1,4 @@
+target
+corpus
+artifacts
+coverage