feat(nncs): Add DNS patches for NNCS hook

src/patches/dns_hooks.cpp

@@ -0,0 +1,36 @@
+#include <wups.h>
+#include <netdb.h>
+
+#include "utils/logger.h"
+#include "config.h"
+#include <array>
+
+const std::pair<const char *, const char *> dns_replacements[] = {
+        // NNCS servers. TODO use Pretendo instead of borrowing Nintendo's
+        { "nncs1.app.nintendowifi.net", "nncs1-lp1.n.n.srv.nintendo.net" },
+        { "nncs2.app.nintendowifi.net", "nncs2-lp1.n.n.srv.nintendo.net" },
+};
+
+static const char * replace_dns_name(const char *dns_name) {
+    DEBUG_FUNCTION_LINE("DNS request for %s", dns_name);
+
+//    if (!Config::connect_to_network) return dns_name;
+
+    for (auto [original, replacement] : dns_replacements) {
+        if (strcmp(original, dns_name) == 0)
+            return replacement;
+    }
+
+    return dns_name;
+}
+
+DECL_FUNCTION(struct hostent *, gethostbyname, const char *dns_name) {
+    return real_gethostbyname(replace_dns_name(dns_name));
+}
+// might need a WUPS_MUST_REPLACE_FOR_PROCESS for Friends
+WUPS_MUST_REPLACE(gethostbyname, WUPS_LOADER_LIBRARY_NSYSNET, gethostbyname);
+
+DECL_FUNCTION(int, getaddrinfo, const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res) {
+    return real_getaddrinfo(replace_dns_name(node), service, hints, res);
+}
+WUPS_MUST_REPLACE(getaddrinfo, WUPS_LOADER_LIBRARY_NSYSNET, getaddrinfo);