connect: Support AddressFamily option

* allow parsing of AddressFamily in config and cli
  * supports options "any", "inet" and "inet6"
* introduce SSH_OPTIONS_ADDRESS_FAMILY

Signed-off-by: Samir Benmendil <me@rmz.io>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

include/libssh/config.h

@@ -68,6 +68,7 @@ enum ssh_config_opcode_e {
     SOC_CONTROLPATH,
     SOC_CERTIFICATE,
     SOC_REQUIRED_RSA_SIZE,
+    SOC_ADDRESSFAMILY,
 
     SOC_MAX /* Keep this one last in the list */
 };

include/libssh/libssh.h

@@ -371,6 +371,12 @@ enum ssh_control_master_options_e {
   SSH_CONTROL_MASTER_AUTOASK
 };
 
+enum ssh_address_family_options_e {
+    SSH_ADDRESS_FAMILY_ANY,
+    SSH_ADDRESS_FAMILY_INET,
+    SSH_ADDRESS_FAMILY_INET6
+};
+
 enum ssh_options_e {
     SSH_OPTIONS_HOST,
     SSH_OPTIONS_PORT,
@@ -422,6 +428,7 @@ enum ssh_options_e {
     SSH_OPTIONS_PROXYJUMP,
     SSH_OPTIONS_PROXYJUMP_CB_LIST_APPEND,
     SSH_OPTIONS_PKI_CONTEXT,
+    SSH_OPTIONS_ADDRESS_FAMILY,
 };
 
 enum {

include/libssh/session.h

@@ -277,6 +277,7 @@ struct ssh_session_struct {
         bool identities_only;
         int control_master;
         char *control_path;
+        int address_family;
     } opts;
 
     /* server options */