Add wpa_msg_global_ctrl()

This is similar to wpa_msg_global() in the same way as wpa_msg_ctrl() is
to wpa_msg(). In other words, wpa_msg_global_ctrl() is used to send
global control interface events without printing them into the debug
log.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/utils/wpa_debug.c

@@ -685,6 +685,34 @@ void wpa_msg_global(void *ctx, int level, const char *fmt, ...)
 }
 
 
+void wpa_msg_global_ctrl(void *ctx, int level, const char *fmt, ...)
+{
+	va_list ap;
+	char *buf;
+	int buflen;
+	int len;
+
+	if (!wpa_msg_cb)
+		return;
+
+	va_start(ap, fmt);
+	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
+	va_end(ap);
+
+	buf = os_malloc(buflen);
+	if (buf == NULL) {
+		wpa_printf(MSG_ERROR,
+			   "wpa_msg_global_ctrl: Failed to allocate message buffer");
+		return;
+	}
+	va_start(ap, fmt);
+	len = vsnprintf(buf, buflen, fmt, ap);
+	va_end(ap);
+	wpa_msg_cb(ctx, level, 1, buf, len);
+	os_free(buf);
+}
+
+
 void wpa_msg_no_global(void *ctx, int level, const char *fmt, ...)
 {
 	va_list ap;

src/utils/wpa_debug.h

@@ -160,6 +160,7 @@ void wpa_hexdump_ascii_key(int level, const char *title, const void *buf,
 #define wpa_msg(args...) do { } while (0)
 #define wpa_msg_ctrl(args...) do { } while (0)
 #define wpa_msg_global(args...) do { } while (0)
+#define wpa_msg_global_ctrl(args...) do { } while (0)
 #define wpa_msg_no_global(args...) do { } while (0)
 #define wpa_msg_register_cb(f) do { } while (0)
 #define wpa_msg_register_ifname_cb(f) do { } while (0)
@@ -211,6 +212,21 @@ PRINTF_FORMAT(3, 4);
 void wpa_msg_global(void *ctx, int level, const char *fmt, ...)
 PRINTF_FORMAT(3, 4);
 
+/**
+ * wpa_msg_global_ctrl - Conditional global printf for ctrl_iface monitors
+ * @ctx: Pointer to context data; this is the ctx variable registered
+ *	with struct wpa_driver_ops::init()
+ * @level: priority level (MSG_*) of the message
+ * @fmt: printf format string, followed by optional arguments
+ *
+ * This function is used to print conditional debugging and error messages.
+ * This function is like wpa_msg_global(), but it sends the output only to the
+ * attached global ctrl_iface monitors. In other words, it can be used for
+ * frequent events that do not need to be sent to syslog.
+ */
+void wpa_msg_global_ctrl(void *ctx, int level, const char *fmt, ...)
+PRINTF_FORMAT(3, 4);
+
 /**
  * wpa_msg_no_global - Conditional printf for ctrl_iface monitors
  * @ctx: Pointer to context data; this is the ctx variable registered