P2PS: Add option to specify seek strings into P2P_FIND

P2PS seek strings can now be specified in the P2P_FIND control interface
command with one or more optional "seek=<str>" parameters.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/p2p/p2p.c

@@ -13,6 +13,8 @@
 #include "common/ieee802_11_defs.h"
 #include "common/ieee802_11_common.h"
 #include "common/wpa_ctrl.h"
+#include "crypto/sha256.h"
+#include "crypto/crypto.h"
 #include "wps/wps_i.h"
 #include "p2p_i.h"
 #include "p2p.h"
@@ -1083,10 +1085,44 @@ static void p2p_free_req_dev_types(struct p2p_data *p2p)
 }
 
 
+static int p2ps_gen_hash(struct p2p_data *p2p, const char *str, u8 *hash)
+{
+	u8 buf[SHA256_MAC_LEN];
+	char str_buf[256];
+	const u8 *adv_array;
+	size_t i, adv_len;
+
+	if (!str || !hash)
+		return 0;
+
+	if (!str[0]) {
+		os_memcpy(hash, p2p->wild_card_hash, P2PS_HASH_LEN);
+		return 1;
+	}
+
+	adv_array = (u8 *) str_buf;
+	adv_len = os_strlen(str);
+
+	for (i = 0; str[i] && i < adv_len; i++) {
+		if (str[i] >= 'A' && str[i] <= 'Z')
+			str_buf[i] = str[i] - 'A' + 'a';
+		else
+			str_buf[i] = str[i];
+	}
+
+	if (sha256_vector(1, &adv_array, &adv_len, buf))
+		return 0;
+
+	os_memcpy(hash, buf, P2PS_HASH_LEN);
+	return 1;
+}
+
+
 int p2p_find(struct p2p_data *p2p, unsigned int timeout,
 	     enum p2p_discovery_type type,
 	     unsigned int num_req_dev_types, const u8 *req_dev_types,
-	     const u8 *dev_id, unsigned int search_delay)
+	     const u8 *dev_id, unsigned int search_delay,
+	     u8 seek_count, const char **seek)
 {
 	int res;
 
@@ -1113,6 +1149,47 @@ int p2p_find(struct p2p_data *p2p, unsigned int timeout,
 	} else
 		p2p->find_dev_id = NULL;
 
+	if (seek_count == 0 || !seek) {
+		/* Not an ASP search */
+		p2p->p2ps_seek = 0;
+	} else if (seek_count == 1 && seek && (!seek[0] || !seek[0][0])) {
+		/*
+		 * An empty seek string means no hash values, but still an ASP
+		 * search.
+		 */
+		p2p->p2ps_seek_count = 0;
+		p2p->p2ps_seek = 1;
+	} else if (seek && seek_count <= P2P_MAX_QUERY_HASH) {
+		u8 buf[P2PS_HASH_LEN];
+		int i;
+
+		p2p->p2ps_seek_count = seek_count;
+		for (i = 0; i < seek_count; i++) {
+			if (!p2ps_gen_hash(p2p, seek[i], buf))
+				continue;
+
+			/* If asking for wildcard, don't do others */
+			if (os_memcmp(buf, p2p->wild_card_hash,
+				      P2PS_HASH_LEN) == 0) {
+				p2p->p2ps_seek_count = 0;
+				break;
+			}
+
+			os_memcpy(&p2p->query_hash[i * P2PS_HASH_LEN], buf,
+				  P2PS_HASH_LEN);
+		}
+		p2p->p2ps_seek = 1;
+	} else {
+		p2p->p2ps_seek_count = 0;
+		p2p->p2ps_seek = 1;
+	}
+
+	/* Special case to perform wildcard search */
+	if (p2p->p2ps_seek_count == 0 && p2p->p2ps_seek) {
+		p2p->p2ps_seek_count = 1;
+		os_memcpy(&p2p->query_hash, p2p->wild_card_hash, P2PS_HASH_LEN);
+	}
+
 	p2p->start_after_scan = P2P_AFTER_SCAN_NOTHING;
 	p2p_clear_timeout(p2p);
 	p2p->cfg->stop_listen(p2p->cfg->cb_ctx);
@@ -1165,6 +1242,9 @@ void p2p_stop_find_for_freq(struct p2p_data *p2p, int freq)
 	p2p_clear_timeout(p2p);
 	if (p2p->state == P2P_SEARCH)
 		p2p->cfg->find_stopped(p2p->cfg->cb_ctx);
+
+	p2p->p2ps_seek_count = 0;
+
 	p2p_set_state(p2p, P2P_IDLE);
 	p2p_free_req_dev_types(p2p);
 	p2p->start_after_scan = P2P_AFTER_SCAN_NOTHING;
@@ -2508,6 +2588,8 @@ struct p2p_data * p2p_init(const struct p2p_config *cfg)
 			p2p->cfg->num_pref_chan = 0;
 	}
 
+	p2ps_gen_hash(p2p, P2PS_WILD_HASH_STR, p2p->wild_card_hash);
+
 	p2p->min_disc_int = 1;
 	p2p->max_disc_int = 3;
 	p2p->max_disc_tu = -1;

src/p2p/p2p.h

@@ -11,7 +11,9 @@
 
 #include "wps/wps_defs.h"
 
+#define P2PS_WILD_HASH_STR "org.wi-fi.wfds"
 #define P2PS_HASH_LEN 6
+#define P2P_MAX_QUERY_HASH 6
 
 /**
  * P2P_MAX_REG_CLASSES - Maximum number of regulatory classes
@@ -943,12 +945,15 @@ enum p2p_discovery_type {
  *	requested device types.
  * @dev_id: Device ID to search for or %NULL to find all devices
  * @search_delay: Extra delay in milliseconds between search iterations
+ * @seek_count: Number of ASP Service Strings in the seek_string array
+ * @seek_string: ASP Service Strings to query for in Probe Requests
  * Returns: 0 on success, -1 on failure
  */
 int p2p_find(struct p2p_data *p2p, unsigned int timeout,
 	     enum p2p_discovery_type type,
 	     unsigned int num_req_dev_types, const u8 *req_dev_types,
-	     const u8 *dev_id, unsigned int search_delay);
+	     const u8 *dev_id, unsigned int search_delay,
+	     u8 seek_count, const char **seek_string);
 
 /**
  * p2p_notify_scan_trigger_status - Indicate scan trigger status

src/p2p/p2p_i.h

@@ -492,6 +492,12 @@ struct p2p_data {
 	u8 pending_channel;
 	u8 pending_channel_forced;
 
+	/* ASP Support */
+	u8 wild_card_hash[P2PS_HASH_LEN];
+	u8 query_hash[P2P_MAX_QUERY_HASH * P2PS_HASH_LEN];
+	u8 p2ps_seek;
+	u8 p2ps_seek_count;
+
 #ifdef CONFIG_WIFI_DISPLAY
 	struct wpabuf *wfd_ie_beacon;
 	struct wpabuf *wfd_ie_probe_req;

wpa_supplicant/ctrl_iface.c

@@ -4483,6 +4483,8 @@ static int p2p_ctrl_find(struct wpa_supplicant *wpa_s, char *cmd)
 	u8 dev_type[WPS_DEV_TYPE_LEN], *_dev_type = NULL;
 	char *pos;
 	unsigned int search_delay;
+	const char *seek[P2P_MAX_QUERY_HASH + 1];
+	u8 seek_count = 0;
 
 	if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
 		wpa_dbg(wpa_s, MSG_INFO,
@@ -4517,8 +4519,33 @@ static int p2p_ctrl_find(struct wpa_supplicant *wpa_s, char *cmd)
 	} else
 		search_delay = wpas_p2p_search_delay(wpa_s);
 
+	/* Must be searched for last, because it adds nul termination */
+	pos = os_strstr(cmd, " seek=");
+	while (pos && seek_count < P2P_MAX_QUERY_HASH + 1) {
+		char *term;
+
+		term = os_strchr(pos + 1, ' ');
+		seek[seek_count++] = pos + 6;
+		pos = os_strstr(pos + 6, " seek=");
+
+		if (term)
+			*term = '\0';
+	}
+
+	if (!seek_count)
+		return wpas_p2p_find(wpa_s, timeout, type, _dev_type != NULL,
+				     _dev_type, _dev_id,
+				     search_delay, 0, NULL);
+
+	if (seek_count > P2P_MAX_QUERY_HASH) {
+		seek[0] = NULL;
+		return wpas_p2p_find(wpa_s, timeout, type, _dev_type != NULL,
+				     _dev_type, _dev_id,
+				     search_delay, 1, seek);
+	}
+
 	return wpas_p2p_find(wpa_s, timeout, type, _dev_type != NULL, _dev_type,
-			     _dev_id, search_delay);
+			     _dev_id, search_delay, seek_count, seek);
 }
 
 
@@ -7654,7 +7681,7 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 #endif /* CONFIG_MESH */
 #ifdef CONFIG_P2P
 	} else if (os_strncmp(buf, "P2P_FIND ", 9) == 0) {
-		if (p2p_ctrl_find(wpa_s, buf + 9))
+		if (p2p_ctrl_find(wpa_s, buf + 8))
 			reply_len = -1;
 	} else if (os_strcmp(buf, "P2P_FIND") == 0) {
 		if (p2p_ctrl_find(wpa_s, ""))

wpa_supplicant/dbus/dbus_new_handlers_p2p.c

@@ -131,7 +131,7 @@ DBusMessage * wpas_dbus_handler_p2p_find(DBusMessage *message,
 		wpa_s = wpa_s->p2p_dev;
 
 	wpas_p2p_find(wpa_s, timeout, type, num_req_dev_types, req_dev_types,
-		      NULL, 0);
+		      NULL, 0, 0, NULL);
 	os_free(req_dev_types);
 	return reply;
 

wpa_supplicant/p2p_supplicant.c

@@ -5912,7 +5912,8 @@ static void wpas_p2p_clear_pending_action_tx(struct wpa_supplicant *wpa_s)
 int wpas_p2p_find(struct wpa_supplicant *wpa_s, unsigned int timeout,
 		  enum p2p_discovery_type type,
 		  unsigned int num_req_dev_types, const u8 *req_dev_types,
-		  const u8 *dev_id, unsigned int search_delay)
+		  const u8 *dev_id, unsigned int search_delay,
+		  u8 seek_cnt, const char **seek_string)
 {
 	wpas_p2p_clear_pending_action_tx(wpa_s);
 	wpa_s->p2p_long_listen = 0;
@@ -5925,7 +5926,7 @@ int wpas_p2p_find(struct wpa_supplicant *wpa_s, unsigned int timeout,
 
 	return p2p_find(wpa_s->global->p2p, timeout, type,
 			num_req_dev_types, req_dev_types, dev_id,
-			search_delay);
+			search_delay, seek_cnt, seek_string);
 }
 
 

wpa_supplicant/p2p_supplicant.h

@@ -55,7 +55,8 @@ enum p2p_discovery_type;
 int wpas_p2p_find(struct wpa_supplicant *wpa_s, unsigned int timeout,
 		  enum p2p_discovery_type type,
 		  unsigned int num_req_dev_types, const u8 *req_dev_types,
-		  const u8 *dev_id, unsigned int search_delay);
+		  const u8 *dev_id, unsigned int search_delay,
+		  u8 seek_cnt, const char **seek_string);
 void wpas_p2p_stop_find(struct wpa_supplicant *wpa_s);
 int wpas_p2p_listen(struct wpa_supplicant *wpa_s, unsigned int timeout);
 int wpas_p2p_listen_start(struct wpa_supplicant *wpa_s, unsigned int timeout);