check i/o errors

webserver/doskast-trigger-connect.c

@@ -112,8 +112,18 @@ main(){
 			}
 		}
 		FCGI_FILE *d = fopen(hex, "w");
+		if (d == NULL) {
+			fprintf(stderr, "Error openning file %s/%s for writing\n", DIR, hex);
+			http_code = HTTP_ERROR;
+			goto fcgi_out;
+		}
 		fprintf(d, "%s", ip);
-		fclose(d);
+		rc = fclose(d);
+		if (rc != 0) {
+			fprintf(stderr, "Error closing file %s/%s\n", DIR, hex);
+			http_code = HTTP_ERROR;
+			goto fcgi_out;
+		}
 		http_code = HTTP_OK;
 fcgi_out:
 		printf("Status: %d\n", http_code);