From aa1ad0a0802e9baf66f4df561ec07490c54d63f4 Mon Sep 17 00:00:00 2001
From: Cory McWilliams <cory@unprompted.com>
Date: Wed, 31 Jul 2024 20:50:41 -0400
Subject: [PATCH] The beginnings of "What would it look like if I used a DHT
 for peer discovery?"

---
 .gitmodules |  3 +++
 GNUmakefile |  5 +++++
 deps/dht    |  1 +
 src/dht.c   | 34 ++++++++++++++++++++++++++++++++++
 4 files changed, 43 insertions(+)
 create mode 160000 deps/dht
 create mode 100644 src/dht.c

diff --git a/.gitmodules b/.gitmodules
index c7527e40..3a4d75e3 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -22,3 +22,6 @@
 [submodule "deps/openssl_src"]
 	path = deps/openssl_src
 	url = https://github.com/openssl/openssl.git
+[submodule "deps/dht"]
+	path = deps/dht
+	url = https://github.com/jech/dht.git
diff --git a/GNUmakefile b/GNUmakefile
index e69eb4e2..7ad09ae0 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -250,6 +250,7 @@ APP_OBJS := $(call get_objs,APP_SOURCES)
 $(APP_OBJS): CFLAGS += \
 	-Ideps/base64c/include \
 	-Ideps/crypt_blowfish \
+	-Ideps/dht \
 	-Ideps/libbacktrace \
 	-Ideps/libsodium \
 	-Ideps/libsodium/src/libsodium/include \
@@ -587,6 +588,9 @@ $(MINIUNZIP_OBJS): CFLAGS += \
 	-Ideps/zlib \
 	-Wno-maybe-uninitialized
 
+DHT_SOURCES := deps/dht/dht.c
+DHT_OBJS := $(call get_objs,DHT_SOURCES)
+
 LDFLAGS += \
 	-pthread \
 	-lm
@@ -633,6 +637,7 @@ all: $(BUILD_TYPES)
 ALL_APP_OBJS := \
 	$(APP_OBJS) \
 	$(BLOWFISH_OBJS) \
+	$(DHT_OBJS) \
 	$(LIBBACKTRACE_OBJS) \
 	$(MINIUNZIP_OBJS) \
 	$(PICOHTTPPARSER_OBJS) \
diff --git a/deps/dht b/deps/dht
new file mode 160000
index 00000000..11123089
--- /dev/null
+++ b/deps/dht
@@ -0,0 +1 @@
+Subproject commit 111230894416d400c9a1e038a033586bfeaafc93
diff --git a/src/dht.c b/src/dht.c
new file mode 100644
index 00000000..07a67b9d
--- /dev/null
+++ b/src/dht.c
@@ -0,0 +1,34 @@
+#include <stddef.h>
+#include <stdio.h>
+
+#if defined(_WIN32)
+#define WIN32_LEAN_AND_MEAN
+#include <winsock2.h>
+#include <windows.h>
+#include <winsock.h>
+#include <ws2tcpip.h>
+#else
+#include <netinet/in.h>
+#include <sys/socket.h>
+#endif
+
+#include "dht.h"
+
+int dht_sendto(int sockfd, const void *buf, int len, int flags, const struct sockaddr *to, int tolen)
+{
+	return -1;
+}
+
+int dht_blacklisted(const struct sockaddr *sa, int salen)
+{
+	return 0;
+}
+
+void dht_hash(void *hash_return, int hash_size, const void *v1, int len1, const void *v2, int len2, const void *v3, int len3)
+{
+}
+
+int dht_random_bytes(void *buf, size_t size)
+{
+	return 0;
+}