Add wpa_cli reconnect command

[Daniel Drake]

reconnect is like reassociate but it only actually performs
reassociation if the interface is in disconnected state.

This is useful for the environment where we want to disable/enable
wireless at various times but would prefer not to wait for each up/down
operation to complete.

There is a possibility of harmless "races" here, where a disconnect command
would be recieved when the interface is already disconnected -- nothing
happens (this is what we want - great!). However, if we were to use
"reassociate" and we were to send that command when the system was
already connected, we'd prefer for it not to actually reassociate.

IOW, reconnect is effectively "reassociate only if disconnected"

I'll happily take suggestions for better command naming here.
Semantically I would expect a reconnect command to be unconditional
(like reassociate is), but at the same time, "reconnect" is nice because
it pairs nicely with "disconnect".
---
 wpa_supplicant/ctrl_iface.c |    6 ++++++
 wpa_supplicant/wpa_cli.c    |   14 ++++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/wpa_supplicant/ctrl_iface.c b/wpa_supplicant/ctrl_iface.c
index 30ca369..ae17511 100644
--- a/wpa_supplicant/ctrl_iface.c
+++ b/wpa_supplicant/ctrl_iface.c
@@ -1225,6 +1225,12 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 		wpa_s->disconnected = 0;
 		wpa_s->reassociate = 1;
 		wpa_supplicant_req_scan(wpa_s, 0, 0);
+	} else if (os_strcmp(buf, "RECONNECT") == 0) {
+		if (wpa_s->disconnected) {
+			wpa_s->disconnected = 0;
+			wpa_s->reassociate = 1;
+			wpa_supplicant_req_scan(wpa_s, 0, 0);
+		}
 	} else if (os_strncmp(buf, "PREAUTH ", 8) == 0) {
 		if (wpa_supplicant_ctrl_iface_preauth(wpa_s, buf + 8))
 			reply_len = -1;
diff --git a/wpa_supplicant/wpa_cli.c b/wpa_supplicant/wpa_cli.c
index a0e226a..4779a4c 100644
--- a/wpa_supplicant/wpa_cli.c
+++ b/wpa_supplicant/wpa_cli.c
@@ -120,8 +120,10 @@ static const char *commands_help =
 "    list of variables when run without arguments)\n"
 "  get_network <network id> <variable> = get network variables\n"
 "  save_config = save the current configuration\n"
-"  disconnect = disconnect and wait for reassociate command before "
-"connecting\n"
+"  disconnect = disconnect and wait for reassociate/reconnect command before\n "
+"    connecting\n"
+"  reconnect = like reassociate, but only takes effect if already "
+"disconnected\n"
 "  scan = request new BSS scan\n"
 "  scan_results = get latest scan results\n"
 "  get_capability <eap/pairwise/group/key_mgmt/proto/auth_alg> = "
@@ -865,6 +867,13 @@ static int wpa_cli_cmd_disconnect(struct wpa_ctrl *ctrl, int argc,
 }
 
 
+static int wpa_cli_cmd_reconnect(struct wpa_ctrl *ctrl, int argc,
+				  char *argv[])
+{
+	return wpa_ctrl_command(ctrl, "RECONNECT");
+}
+
+
 static int wpa_cli_cmd_save_config(struct wpa_ctrl *ctrl, int argc,
 				   char *argv[])
 {
@@ -1049,6 +1058,7 @@ static struct wpa_cli_cmd wpa_cli_commands[] = {
 	{ "get_network", wpa_cli_cmd_get_network },
 	{ "save_config", wpa_cli_cmd_save_config },
 	{ "disconnect", wpa_cli_cmd_disconnect },
+	{ "reconnect", wpa_cli_cmd_reconnect },
 	{ "scan", wpa_cli_cmd_scan },
 	{ "scan_results", wpa_cli_cmd_scan_results },
 	{ "get_capability", wpa_cli_cmd_get_capability },
-- 
1.5.2.2