Mention address if not unspecific on DNS failure

With the recent changes breaking configs that included lport 0, it became
apparent that having  the address family in the error message when
resolving fails, would have made diagnosis in this case and probably others
much easier.

Change-Id: I1c8fcd5bb6e1fa0020d52879eefbafdb2630e7b5
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20250325195750.7899-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg31237.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>

diff --git a/src/openvpn/socket.c b/src/openvpn/socket.c
index 6b32e303369a05ed3201b0dcb1dfb8201b952073..09de1b0b02496bb233ee444773ef04f8b0a4cc91 100644 (file)
--- a/src/openvpn/socket.c
+++ b/src/openvpn/socket.c
@@ -445,6 +445,22 @@ err:
     throw_signal_soft(SIGHUP, "Preresolving failed");
 }
 
+/**
+ * Small helper function for openvpn_getaddrinfo to print the address
+ * family when resolving fails
+ */
+static const char *
+getaddrinfo_addr_family_name(int af)
+{
+    switch (af)
+    {
+        case AF_INET:  return "[AF_INET]";
+
+        case AF_INET6: return "[AF_INET6]";
+    }
+    return "";
+}
+
 /*
  * Translate IPv4/IPv6 addr or hostname into struct addrinfo
  * If resolve error, try again for resolve_retry_seconds seconds.
@@ -545,11 +561,11 @@ openvpn_getaddrinfo(unsigned int flags,
             print_hostname = "undefined";
         }
 
-        fmt = "RESOLVE: Cannot resolve host address: %s:%s (%s)";
+        fmt = "RESOLVE: Cannot resolve host address: %s:%s%s (%s)";
         if ((flags & GETADDR_MENTION_RESOLVE_RETRY)
             && !resolve_retry_seconds)
         {
-            fmt = "RESOLVE: Cannot resolve host address: %s:%s (%s) "
+            fmt = "RESOLVE: Cannot resolve host address: %s:%s%s (%s)"
                   "(I would have retried this name query if you had "
                   "specified the --resolv-retry option.)";
         }
@@ -639,6 +655,7 @@ openvpn_getaddrinfo(unsigned int flags,
                 fmt,
                 print_hostname,
                 print_servname,
+                getaddrinfo_addr_family_name(ai_family),
                 gai_strerror(status));
 
             if (--resolve_retries <= 0)