wpa_supplicant: bgscan.c Source File

00001 /*
00002  * WPA Supplicant - background scan and roaming interface
00003  * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
00004  *
00005  * This program is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License version 2 as
00007  * published by the Free Software Foundation.
00008  *
00009  * Alternatively, this software may be distributed under the terms of BSD
00010  * license.
00011  *
00012  * See README and COPYING for more details.
00013  */
00014 
00015 #include "includes.h"
00016 
00017 #include "common.h"
00018 #include "wpa_supplicant_i.h"
00019 #include "config_ssid.h"
00020 #include "bgscan.h"
00021 
00022 #ifdef CONFIG_BGSCAN_SIMPLE
00023 extern const struct bgscan_ops bgscan_simple_ops;
00024 #endif /* CONFIG_BGSCAN_SIMPLE */
00025 
00026 static const struct bgscan_ops * bgscan_modules[] = {
00027 #ifdef CONFIG_BGSCAN_SIMPLE
00028         &bgscan_simple_ops,
00029 #endif /* CONFIG_BGSCAN_SIMPLE */
00030         NULL
00031 };
00032 
00033 
00034 int bgscan_init(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
00035 {
00036         const char *name = ssid->bgscan;
00037         const char *params;
00038         size_t nlen;
00039         int i;
00040         const struct bgscan_ops *ops = NULL;
00041 
00042         bgscan_deinit(wpa_s);
00043         if (name == NULL)
00044                 return 0;
00045 
00046         params = os_strchr(name, ':');
00047         if (params == NULL) {
00048                 params = "";
00049                 nlen = os_strlen(name);
00050         } else {
00051                 nlen = params - name;
00052                 params++;
00053         }
00054 
00055         for (i = 0; bgscan_modules[i]; i++) {
00056                 if (os_strncmp(name, bgscan_modules[i]->name, nlen) == 0) {
00057                         ops = bgscan_modules[i];
00058                         break;
00059                 }
00060         }
00061 
00062         if (ops == NULL) {
00063                 wpa_printf(MSG_ERROR, "bgscan: Could not find module "
00064                            "matching the parameter '%s'", name);
00065                 return -1;
00066         }
00067 
00068         wpa_s->bgscan_priv = ops->init(wpa_s, params, ssid);
00069         if (wpa_s->bgscan_priv == NULL)
00070                 return -1;
00071         wpa_s->bgscan = ops;
00072         wpa_printf(MSG_DEBUG, "bgscan: Initialized module '%s' with "
00073                    "parameters '%s'", ops->name, params);
00074 
00075         return 0;
00076 }
00077 
00078 
00079 void bgscan_deinit(struct wpa_supplicant *wpa_s)
00080 {
00081         if (wpa_s->bgscan && wpa_s->bgscan_priv) {
00082                 wpa_printf(MSG_DEBUG, "bgscan: Deinitializing module '%s'",
00083                            wpa_s->bgscan->name);
00084                 wpa_s->bgscan->deinit(wpa_s->bgscan_priv);
00085                 wpa_s->bgscan = NULL;
00086                 wpa_s->bgscan_priv = NULL;
00087         }
00088 }
00089 
00090 
00091 int bgscan_notify_scan(struct wpa_supplicant *wpa_s)
00092 {
00093         if (wpa_s->bgscan && wpa_s->bgscan_priv)
00094                 return wpa_s->bgscan->notify_scan(wpa_s->bgscan_priv);
00095         return 0;
00096 }
00097 
00098 
00099 void bgscan_notify_beacon_loss(struct wpa_supplicant *wpa_s)
00100 {
00101         if (wpa_s->bgscan && wpa_s->bgscan_priv)
00102                 wpa_s->bgscan->notify_beacon_loss(wpa_s->bgscan_priv);
00103 }
00104 
00105 
00106 void bgscan_notify_signal_change(struct wpa_supplicant *wpa_s, int above)
00107 {
00108         if (wpa_s->bgscan && wpa_s->bgscan_priv)
00109                 wpa_s->bgscan->notify_signal_change(wpa_s->bgscan_priv, above);
00110 }