Add tcp syn packet fingerprinting to redbean

This change also fixes bugs in enoprotoopt reporting with setsockopt and
getsockopt error returns.

test/net/finger/test.mk

@@ -0,0 +1,46 @@
+#-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
+#───vi: set et ft=make ts=8 tw=8 fenc=utf-8 :vi───────────────────────┘
+
+PKGS += TEST_NET_FINGER
+
+TEST_NET_FINGER_SRCS := $(wildcard test/net/finger/*.c)
+TEST_NET_FINGER_SRCS_TEST = $(filter %_test.c,$(TEST_NET_FINGER_SRCS))
+TEST_NET_FINGER_BINS = $(TEST_NET_FINGER_COMS) $(TEST_NET_FINGER_COMS:%=%.dbg)
+
+TEST_NET_FINGER_OBJS =						\
+	$(TEST_NET_FINGER_SRCS:%.c=o/$(MODE)/%.o)
+
+TEST_NET_FINGER_COMS =						\
+	$(TEST_NET_FINGER_SRCS:%.c=o/$(MODE)/%.com)
+
+TEST_NET_FINGER_TESTS =						\
+	$(TEST_NET_FINGER_SRCS_TEST:%.c=o/$(MODE)/%.com.ok)
+
+TEST_NET_FINGER_CHECKS =					\
+	$(TEST_NET_FINGER_SRCS_TEST:%.c=o/$(MODE)/%.com.runs)
+
+TEST_NET_FINGER_DIRECTDEPS =					\
+	NET_FINGER						\
+	LIBC_LOG						\
+	LIBC_TESTLIB						\
+	THIRD_PARTY_MBEDTLS
+
+TEST_NET_FINGER_DEPS :=						\
+	$(call uniq,$(foreach x,$(TEST_NET_FINGER_DIRECTDEPS),$($(x))))
+
+o/$(MODE)/test/net/finger/finger.pkg:				\
+		$(TEST_NET_FINGER_OBJS)				\
+		$(foreach x,$(TEST_NET_FINGER_DIRECTDEPS),$($(x)_A).pkg)
+
+o/$(MODE)/test/net/finger/%.com.dbg:				\
+		$(TEST_NET_FINGER_DEPS)				\
+		o/$(MODE)/test/net/finger/%.o			\
+		$(LIBC_TESTMAIN)				\
+		$(CRT)						\
+		$(APE_NO_MODIFY_SELF)
+	@$(APELINK)
+
+.PHONY: o/$(MODE)/test/net/finger
+o/$(MODE)/test/net/finger:					\
+		$(TEST_NET_FINGER_BINS)				\
+		$(TEST_NET_FINGER_CHECKS)