Add timeouts to crt.sh and yandex enumerations

With the timeout set for the enum requests, dnsrecon may continue
running even if one of the services is temporarily down or not
reachable. crt.sh sometimes takes longer to respond, so a higher 30
second timeout was chosen here.

lib/crtenum.py

@@ -34,7 +34,7 @@ def scrape_crtsh(dom):
 
     req = Request(url=url, headers=headers)
     try:
-        resp = urlopen(req)
+        resp = urlopen(req, timeout=30)
         data = resp.read()
     except HTTPError as e:
         print_error(f'Bad http status from crt.sh: "{e.code}"')

lib/yandexenum.py

@@ -16,7 +16,6 @@
 #    along with this program; if not, write to the Free Software
 #    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
-
 import urllib
 import re
 import time
@@ -42,7 +41,7 @@ def scrape_yandex(dom):
     for _ in searches:
         url = "https://yandex.com/search/?text=site%3A" + dom
         try:
-            sock = urllib.request.urlopen(url)
+            sock = urllib.request.urlopen(url, timeout=10)
             data = sock.read().decode("utf-8")
             sock.close()
         except Exception as e: