Refactor using Tauri (#278)

crates/openconnect/src/ffi/vpn.h

@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <openconnect.h>
+
+typedef void (*vpn_connected_callback)(int cmd_pipe_fd, void *user_data);
+
+typedef struct vpn_options
+{
+    void *user_data;
+    const char *server;
+    const char *cookie;
+    const char *user_agent;
+
+    const char *script;
+    const char *os;
+    const char *certificate;
+    const char *servercert;
+} vpn_options;
+
+int vpn_connect(const vpn_options *options, vpn_connected_callback callback);
+void vpn_disconnect();
+
+extern void vpn_log(int level, const char *msg);
+
+static char *format_message(const char *format, va_list args)
+{
+    va_list args_copy;
+    va_copy(args_copy, args);
+    int len = vsnprintf(NULL, 0, format, args_copy);
+    va_end(args_copy);
+
+    char *buffer = malloc(len + 1);
+    if (buffer == NULL)
+    {
+        return NULL;
+    }
+
+    vsnprintf(buffer, len + 1, format, args);
+    return buffer;
+}
+
+static void _log(int level, ...)
+{
+    va_list args;
+    va_start(args, level);
+
+    char *format = va_arg(args, char *);
+    char *message = format_message(format, args);
+
+    va_end(args);
+
+    if (message == NULL)
+    {
+        vpn_log(PRG_ERR, "Failed to format log message");
+    }
+    else
+    {
+        vpn_log(level, message);
+        free(message);
+    }
+}
+
+#define LOG(level, ...) _log(level, __VA_ARGS__)
+#define ERROR(...) LOG(PRG_ERR, __VA_ARGS__)
+#define INFO(...) LOG(PRG_INFO, __VA_ARGS__)
+#define DEBUG(...) LOG(PRG_DEBUG, __VA_ARGS__)
+#define TRACE(...) LOG(PRG_TRACE, __VA_ARGS__)