Allow global ctrl_iface to be used for per-interface commands

"IFNAME=<ifname> " prefix can now be used on the wpa_supplicant global
control interface to direct a command to a specific interface instead of
having to use an interface specific control interface for this. This
allows a single socket to be used for controlling multiple virtual
interfaces.

Signed-hostap: Jouni Malinen <j@w1.fi>

wpa_supplicant/ctrl_iface.c

@@ -5798,6 +5798,30 @@ static int wpa_supplicant_global_iface_interfaces(struct wpa_global *global,
 }
 
 
+static char * wpas_global_ctrl_iface_ifname(struct wpa_global *global,
+					    const char *ifname,
+					    char *cmd, size_t *resp_len)
+{
+	struct wpa_supplicant *wpa_s;
+
+	for (wpa_s = global->ifaces; wpa_s; wpa_s = wpa_s->next) {
+		if (os_strcmp(ifname, wpa_s->ifname) == 0)
+			break;
+	}
+
+	if (wpa_s == NULL) {
+		char *resp = os_strdup("FAIL-NO-IFNAME-MATCH\n");
+		if (resp)
+			*resp_len = os_strlen(resp);
+		else
+			*resp_len = 1;
+		return resp;
+	}
+
+	return wpa_supplicant_ctrl_iface_process(wpa_s, cmd, resp_len);
+}
+
+
 char * wpa_supplicant_global_ctrl_iface_process(struct wpa_global *global,
 						char *buf, size_t *resp_len)
 {
@@ -5806,6 +5830,16 @@ char * wpa_supplicant_global_ctrl_iface_process(struct wpa_global *global,
 	int reply_len;
 	int level = MSG_DEBUG;
 
+	if (os_strncmp(buf, "IFNAME=", 7) == 0) {
+		char *pos = os_strchr(buf + 7, ' ');
+		if (pos) {
+			*pos++ = '\0';
+			return wpas_global_ctrl_iface_ifname(global,
+							     buf + 7, pos,
+							     resp_len);
+		}
+	}
+
 	if (os_strcmp(buf, "PING") == 0)
 		level = MSG_EXCESSIVE;
 	wpa_hexdump_ascii(level, "RX global ctrl_iface",