From 601be011e18098dcda1306eeacb02fe4d3eee9ba Mon Sep 17 00:00:00 2001
From: Maurice Heumann <mauriceheumann@gmail.com>
Date: Mon, 10 Apr 2023 15:05:23 +0200
Subject: [PATCH] Prepare sendpacket fixes

---
 src/client/component/network.cpp | 35 ++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/src/client/component/network.cpp b/src/client/component/network.cpp
index 9a722405..c517e862 100644
--- a/src/client/component/network.cpp
+++ b/src/client/component/network.cpp
@@ -256,6 +256,38 @@ namespace network
 		return a.port == b.port && a.addr == b.addr;
 	}
 
+	int net_sendpacket_stub(const game::netsrc_t sock, const int length, const char* data, const game::netadr_t* to)
+	{
+		printf("Sending packet of size: %X\n", length);
+
+		if (to->type != game::NA_RAWIP)
+		{
+			printf("NET_SendPacket: bad address type\n");
+			return 0;
+		}
+
+		const auto s = *game::ip_socket;
+		if (!s || sock > game::NS_MAXCLIENTS)
+		{
+			return 0;
+		}
+
+		sockaddr_in address{};
+		address.sin_family = AF_INET;
+		address.sin_port = htons(to->port);
+		address.sin_addr.s_addr = htonl(((to->ipv4.c | ((to->ipv4.b | (to->ipv4.a << 8)) << 8)) << 8) | to->ipv4.d);
+
+		const auto size = static_cast<size_t>(length);
+
+		std::vector<char> buffer{};
+		buffer.resize(size + 1);
+		buffer[0] = static_cast<char>((static_cast<uint32_t>(sock) & 0xF) | ((to->localNetID & 0xF) << 4));
+		memcpy(buffer.data() + 1, data, size);
+
+		return sendto(s, buffer.data(), static_cast<int>(buffer.size()), 0, reinterpret_cast<sockaddr*>(&address),
+		              sizeof(address));
+	}
+
 	struct component final : generic_component
 	{
 		void post_unpack() override
@@ -268,6 +300,9 @@ namespace network
 			// skip checksum verification
 			utils::hook::set<uint8_t>(game::select(0x14233249E, 0x140596F2E), 0); // don't add checksum to packet
 
+			// Recreate NET_SendPacket to increase max packet size
+			utils::hook::jump(game::select(0x1423323B0, 0x140596E40), net_sendpacket_stub);
+
 			utils::hook::set<uint32_t>(game::select(0x14134C6E0, 0x14018E574), 5);
 			// set initial connection state to challenging