Fix device scan.

.github/workflows/build.yml

@@ -154,6 +154,7 @@ jobs:
 
       - name: Configure
         run: |
+          xmake lua private.xrepo clean
           xmake f ${{ matrix.plat.extra-configure-flags }} -a ${{ matrix.plat.arch }} -m ${{ matrix.mode }} -p ${{ matrix.plat.os }} --toolchain=${{ matrix.plat.toolchain }} -vD -y
 
       - name: Build

src/tools/nfc-staticnested/main.cpp

@@ -12,6 +12,8 @@
 
 #include "pwn_host.h"
 
+#include "utility.h"
+
 using namespace nfcpp;
 using namespace nfcpp::mifare;
 
@@ -20,6 +22,10 @@ auto load_args(int argc, char* argv[]) {
 
     InputArguments args;
 
+    program.add_argument("-c", "--connstring")
+        .default_value("")
+        .store_into(args.connstring)
+        .help("Specify the device's connstring.");
     program.add_argument("-m", "--mifare-classic")
         .default_value("1k")
         .choices("mini", "1k", "2k", "4k")
@@ -98,10 +104,39 @@ int main(int argc, char* argv[]) CPPTRACE_TRY {
     // Start libnfc lifecycle
     NfcContext context;
 
-    auto device = context.open_device();
+    auto hack_ctx = reinterpret_cast<libhack::nfc_context*>(context.get());
+
+    // We do not want to scan for new devices in nfc_open.
+    hack_ctx->allow_autoscan = false;
+
+    auto device = context.open_device(args.connstring);
+    if (!device && args.connstring.empty()) {
+        std::println("Scanning device...");
+
+        // Re-enable it.
+        hack_ctx->allow_autoscan       = true;
+        hack_ctx->allow_intrusive_scan = true;
+
+        auto connstrings = context.list_devices();
+        if (connstrings.empty()) {
+            throw std::runtime_error("No device found.");
+        }
+        // TODO: Libc++ does not yet support C++23 std::views::enumerate
+        for (auto i : std::views::iota(0uz, connstrings.size())) {
+            std::println("{} {}", i == 0 ? "*" : "-", connstrings[i]);
+        }
+        args.connstring = connstrings[0];
+        std::println(
+            "You can use '--connstring \"{}\"' or add it to libnfc.conf to "
+            "avoid duplicated scanning.",
+            args.connstring
+        );
+        device = context.open_device(args.connstring);
+    }
     if (!device) {
-        throw std::runtime_error("No device found.");
+        throw std::runtime_error("Failed to open device!");
     }
+
     std::println("NFC device opened: {}", device->get_name());
 
     auto initiator = device->as_initiator();

src/tools/nfc-staticnested/pwn_host.h

@@ -16,6 +16,7 @@
 namespace nfcpp {
 
 struct InputArguments {
+    std::string                      connstring;
     mifare::MifareCard               type;
     bool                             force_detect_distance;
     std::string                      dump_keys;

src/utility.h

@@ -85,4 +85,24 @@ constexpr auto start_block_sequence(MifareCard type) {
 
 } // namespace mifare
 
+namespace libhack {
+
+typedef char nfc_connstring[1024];
+
+struct nfc_user_defined_device {
+    char           name[256];
+    nfc_connstring connstring;
+    bool           optional;
+};
+
+struct nfc_context {
+    bool                           allow_autoscan;
+    bool                           allow_intrusive_scan;
+    uint32_t                       log_level;
+    struct nfc_user_defined_device user_defined_devices[4];
+    unsigned int                   user_defined_device_count;
+};
+
+} // namespace libhack
+
 } // namespace nfcpp