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      1 /*
      2  * UPnP for WPS / internal definitions
      3  * Copyright (c) 2000-2003 Intel Corporation
      4  * Copyright (c) 2006-2007 Sony Corporation
      5  * Copyright (c) 2008-2009 Atheros Communications
      6  * Copyright (c) 2009, Jouni Malinen <j (at) w1.fi>
      7  *
      8  * See wps_upnp.c for more details on licensing and code history.
      9  */
     10 
     11 #ifndef WPS_UPNP_I_H
     12 #define WPS_UPNP_I_H
     13 
     14 #include "utils/list.h"
     15 #include "http.h"
     16 
     17 #define UPNP_MULTICAST_ADDRESS  "239.255.255.250" /* for UPnP multicasting */
     18 #define UPNP_MULTICAST_PORT 1900 /* UDP port to monitor for UPnP */
     19 
     20 /* min subscribe time per UPnP standard */
     21 #define UPNP_SUBSCRIBE_SEC_MIN 1800
     22 /* subscribe time we use */
     23 #define UPNP_SUBSCRIBE_SEC (UPNP_SUBSCRIBE_SEC_MIN + 1)
     24 
     25 /* "filenames" used in URLs that we service via our "web server": */
     26 #define UPNP_WPS_DEVICE_XML_FILE "wps_device.xml"
     27 #define UPNP_WPS_SCPD_XML_FILE   "wps_scpd.xml"
     28 #define UPNP_WPS_DEVICE_CONTROL_FILE "wps_control"
     29 #define UPNP_WPS_DEVICE_EVENT_FILE "wps_event"
     30 
     31 #define MULTICAST_MAX_READ 1600 /* max bytes we'll read for UPD request */
     32 
     33 
     34 struct upnp_wps_device_sm;
     35 struct wps_registrar;
     36 
     37 
     38 enum advertisement_type_enum {
     39 	ADVERTISE_UP = 0,
     40 	ADVERTISE_DOWN = 1,
     41 	MSEARCH_REPLY = 2
     42 };
     43 
     44 /*
     45  * Advertisements are broadcast via UDP NOTIFYs, and are also the essence of
     46  * the reply to UDP M-SEARCH requests. This struct handles both cases.
     47  *
     48  * A state machine is needed because a number of variant forms must be sent in
     49  * separate packets and spread out in time to avoid congestion.
     50  */
     51 struct advertisement_state_machine {
     52 	struct dl_list list;
     53 	enum advertisement_type_enum type;
     54 	int state;
     55 	int nerrors;
     56 	struct sockaddr_in client; /* for M-SEARCH replies */
     57 };
     58 
     59 
     60 /*
     61  * An address of a subscriber (who may have multiple addresses). We are
     62  * supposed to send (via TCP) updates to each subscriber, trying each address
     63  * for a subscriber until we find one that seems to work.
     64  */
     65 struct subscr_addr {
     66 	struct dl_list list;
     67 	char *domain_and_port; /* domain and port part of url */
     68 	char *path; /* "filepath" part of url (from "mem") */
     69 	struct sockaddr_in saddr; /* address for doing connect */
     70 	unsigned num_failures;
     71 };
     72 
     73 
     74 /*
     75  * Subscribers to our events are recorded in this struct. This includes a max
     76  * of one outgoing connection (sending an "event message") per subscriber. We
     77  * also have to age out subscribers unless they renew.
     78  */
     79 struct subscription {
     80 	struct dl_list list;
     81 	struct upnp_wps_device_sm *sm; /* parent */
     82 	time_t timeout_time; /* when to age out the subscription */
     83 	unsigned next_subscriber_sequence; /* number our messages */
     84 	/*
     85 	 * This uuid identifies the subscription and is randomly generated by
     86 	 * us and given to the subscriber when the subscription is accepted;
     87 	 * and is then included with each event sent to the subscriber.
     88 	 */
     89 	u8 uuid[UUID_LEN];
     90 	/* Linked list of address alternatives (rotate through on failure) */
     91 	struct dl_list addr_list;
     92 	struct dl_list event_queue; /* Queued event messages. */
     93 	struct wps_event_ *current_event; /* non-NULL if being sent (not in q)
     94 					   */
     95 	int last_event_failed; /* Whether delivery of last event failed */
     96 
     97 	/* Information from SetSelectedRegistrar action */
     98 	u8 selected_registrar;
     99 	u16 dev_password_id;
    100 	u16 config_methods;
    101 	u8 authorized_macs[WPS_MAX_AUTHORIZED_MACS][ETH_ALEN];
    102 	struct wps_registrar *reg;
    103 };
    104 
    105 
    106 struct upnp_wps_device_interface {
    107 	struct dl_list list;
    108 	struct upnp_wps_device_ctx *ctx; /* callback table */
    109 	struct wps_context *wps;
    110 	void *priv;
    111 
    112 	/* FIX: maintain separate structures for each UPnP peer */
    113 	struct upnp_wps_peer peer;
    114 };
    115 
    116 /*
    117  * Our instance data corresponding to the AP device. Note that there may be
    118  * multiple wireless interfaces sharing the same UPnP device instance. Each
    119  * such interface is stored in the list of struct upnp_wps_device_interface
    120  * instances.
    121  *
    122  * This is known as an opaque struct declaration to users of the WPS UPnP code.
    123  */
    124 struct upnp_wps_device_sm {
    125 	struct dl_list interfaces; /* struct upnp_wps_device_interface */
    126 	char *root_dir;
    127 	char *desc_url;
    128 	int started; /* nonzero if we are active */
    129 	u8 mac_addr[ETH_ALEN]; /* mac addr of network i.f. we use */
    130 	char *ip_addr_text; /* IP address of network i.f. we use */
    131 	unsigned ip_addr; /* IP address of network i.f. we use (host order) */
    132 	int multicast_sd; /* send multicast messages over this socket */
    133 	int ssdp_sd; /* receive discovery UPD packets on socket */
    134 	int ssdp_sd_registered; /* nonzero if we must unregister */
    135 	unsigned advertise_count; /* how many advertisements done */
    136 	struct advertisement_state_machine advertisement;
    137 	struct dl_list msearch_replies;
    138 	int web_port; /* our port that others get xml files from */
    139 	struct http_server *web_srv;
    140 	/* Note: subscriptions are kept in expiry order */
    141 	struct dl_list subscriptions;
    142 	int event_send_all_queued; /* if we are scheduled to send events soon
    143 				    */
    144 
    145 	char *wlanevent; /* the last WLANEvent data */
    146 	enum upnp_wps_wlanevent_type wlanevent_type;
    147 	os_time_t last_event_sec;
    148 	unsigned int num_events_in_sec;
    149 };
    150 
    151 /* wps_upnp.c */
    152 void format_date(struct wpabuf *buf);
    153 struct subscription * subscription_start(struct upnp_wps_device_sm *sm,
    154 					 const char *callback_urls);
    155 struct subscription * subscription_renew(struct upnp_wps_device_sm *sm,
    156 					 const u8 uuid[UUID_LEN]);
    157 void subscription_destroy(struct subscription *s);
    158 struct subscription * subscription_find(struct upnp_wps_device_sm *sm,
    159 					const u8 uuid[UUID_LEN]);
    160 void subscr_addr_delete(struct subscr_addr *a);
    161 int send_wpabuf(int fd, struct wpabuf *buf);
    162 int get_netif_info(const char *net_if, unsigned *ip_addr, char **ip_addr_text,
    163 		   u8 mac[ETH_ALEN]);
    164 
    165 /* wps_upnp_ssdp.c */
    166 void msearchreply_state_machine_stop(struct advertisement_state_machine *a);
    167 int advertisement_state_machine_start(struct upnp_wps_device_sm *sm);
    168 void advertisement_state_machine_stop(struct upnp_wps_device_sm *sm,
    169 				      int send_byebye);
    170 void ssdp_listener_stop(struct upnp_wps_device_sm *sm);
    171 int ssdp_listener_start(struct upnp_wps_device_sm *sm);
    172 int ssdp_listener_open(void);
    173 int add_ssdp_network(const char *net_if);
    174 int ssdp_open_multicast_sock(u32 ip_addr);
    175 int ssdp_open_multicast(struct upnp_wps_device_sm *sm);
    176 
    177 /* wps_upnp_web.c */
    178 int web_listener_start(struct upnp_wps_device_sm *sm);
    179 void web_listener_stop(struct upnp_wps_device_sm *sm);
    180 
    181 /* wps_upnp_event.c */
    182 int event_add(struct subscription *s, const struct wpabuf *data, int probereq);
    183 void event_delete_all(struct subscription *s);
    184 void event_send_all_later(struct upnp_wps_device_sm *sm);
    185 void event_send_stop_all(struct upnp_wps_device_sm *sm);
    186 
    187 /* wps_upnp_ap.c */
    188 int upnp_er_set_selected_registrar(struct wps_registrar *reg,
    189 				   struct subscription *s,
    190 				   const struct wpabuf *msg);
    191 void upnp_er_remove_notification(struct wps_registrar *reg,
    192 				 struct subscription *s);
    193 
    194 #endif /* WPS_UPNP_I_H */
    195