soul: Add network hooks

games/soulhook/dllmain.c

@@ -40,6 +40,7 @@
 #include "soulhook/io4.h"
 #include "soulhook/soul-dll.h"
 #include "soulhook/soul-gfx.h"
+#include "soulhook/network.h"
 
 #include "platform/platform.h"
 
@@ -68,6 +69,7 @@ static DWORD CALLBACK soul_pre_startup(void)
     touch_screen_hook_init(&soul_hook_cfg.touch, soul_hook_mod);
     serial_hook_init();
     soulgfx_hook_init();
+    network_hook_init(&soul_hook_cfg.platform);
 
     /* Hook external DLL APIs */
 

games/soulhook/meson.build

@@ -24,6 +24,8 @@ shared_library(
         'dllmain.c',
         'io4.c',
         'io4.h',
+        'network.c',
+        'network.h',
         'soul-dll.c',
         'soul-dll.h',
         'soul-gfx.c',

games/soulhook/network.c

@@ -0,0 +1,53 @@
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ws2tcpip.h>
+
+#include "hook/table.h"
+
+#include "hooklib/dll.h"
+
+#include "util/dprintf.h"
+
+#include "platform/platform.h"
+
+#include "network.h"
+
+static int hook_bind(SOCKET s, const struct sockaddr* addr, int namelen);
+static int (*next_bind)(SOCKET s, const struct sockaddr* addr, int namelen);
+static int local_ip;
+
+static const struct hook_symbol network_syms[] = {{
+    .name       = "bind",
+    .ordinal    = 2,
+    .patch      = hook_bind,
+    .link       = (void**)&next_bind,
+}};
+
+void network_hook_init(struct platform_config* config)
+{
+    if (config->netenv.enable) {
+        dprintf("Network: Hooks enabled.\n");
+
+        local_ip = htonl(config->nusec.subnet | config->netenv.addr_suffix);
+
+        hook_table_apply(
+            NULL,
+            "ws2_32.dll",
+            network_syms,
+            _countof(network_syms));
+    }
+}
+
+static int hook_bind(SOCKET s, const struct sockaddr* addr, int namelen) {
+    if (addr->sa_family == AF_INET) {
+        struct sockaddr_in* addr_in = (struct sockaddr_in*)addr;
+
+        if (!memcmp(&addr_in->sin_addr, &local_ip, 4)) {
+            ZeroMemory(&addr_in->sin_addr, sizeof(struct in_addr));
+        }
+    }
+
+    return next_bind(s, addr, namelen);
+}

games/soulhook/network.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <windows.h>
+
+void network_hook_init(struct platform_config* config);