Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/redphone/NetworkUtil.cpp

@@ -0,0 +1,37 @@
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+
+#include <jni.h>
+#include <android/log.h>
+
+#include "NetworkUtil.h"
+
+#define TAG "NetworkUtil"
+
+int NetworkUtil::getAddressType(const char* serverIp) {
+  struct addrinfo hint, *res = NULL;
+  int result;
+
+  memset(&hint, 0, sizeof(hint));
+
+  hint.ai_family = PF_UNSPEC;
+  hint.ai_flags  = AI_NUMERICHOST;
+
+  if (getaddrinfo(serverIp, NULL, &hint, &res) != 0) {
+    __android_log_print(ANDROID_LOG_WARN, TAG, "getaddrinfo failed! %s", serverIp);
+    result = -1;
+  } else if (res->ai_family == AF_INET) {
+    result = 1;
+  } else if (res->ai_family == AF_INET6) {
+    result = 0;
+  } else {
+    __android_log_print(ANDROID_LOG_WARN, TAG, "getaddrinfo returned unknown type for %s", serverIp);
+    result = -1;
+  }
+
+  freeaddrinfo(res);
+
+  return result;
+}