Added ability for SDLTCPTransport to check hostname before we attempt to connect, and correctly errors out if the hostname is invalid/unreachable.

1 files changed, 10 insertions, 1 deletions

diff --git a/SmartDeviceLink-iOS/SmartDeviceLink/SDLTCPTransport.m b/SmartDeviceLink-iOS/SmartDeviceLink/SDLTCPTransport.m
index 9a2501a1e..b80bf93dd 100644
--- a/SmartDeviceLink-iOS/SmartDeviceLink/SDLTCPTransport.m
+++ b/SmartDeviceLink-iOS/SmartDeviceLink/SDLTCPTransport.m
@@ -14,6 +14,7 @@
 #import <sys/wait.h>
 #import <netinet/in.h>
 #import <netdb.h>
+#import <SystemConfiguration/SystemConfiguration.h>
 
 
 // C function forward declarations.
@@ -127,7 +128,15 @@ int call_socket(const char *hostname, const char *port) {
         gethostname(localhost, sizeof localhost);
         hostname = (const char *)&localhost;
     }
-
+    
+    // check if hostname address is valid before we attempt to connect.
+    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr *)hostname);
+    if (reachability == NULL) {
+        return (-1);
+    } else {
+        CFRelease(reachability);
+    }
+    
     //getaddrinfo setup
     if ((status = getaddrinfo(hostname, port, &hints, &servinfo)) != 0) {
         fprintf(stderr, "getaddrinfo error: %s\n", gai_strerror(status));