1 files changed, 534 insertions, 176 deletions

diff --git a/contrib/wpa/wpa_supplicant/ctrl_iface_unix.c b/contrib/wpa/wpa_supplicant/ctrl_iface_unix.c
index f792863..b1ac766 100644
--- a/contrib/wpa/wpa_supplicant/ctrl_iface_unix.c
+++ b/contrib/wpa/wpa_supplicant/ctrl_iface_unix.c
@@ -1,6 +1,6 @@
 /*
  * WPA Supplicant / UNIX domain socket -based control interface
- * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
+ * Copyright (c) 2004-2014, Jouni Malinen <j@w1.fi>
  *
  * This software may be distributed under the terms of the BSD license.
  * See README for more details.
@@ -47,19 +47,37 @@ struct ctrl_iface_priv {
 	struct wpa_supplicant *wpa_s;
 	int sock;
 	struct dl_list ctrl_dst;
+	int android_control_socket;
 };
 
 
-static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
+struct ctrl_iface_global_priv {
+	struct wpa_global *global;
+	int sock;
+	struct dl_list ctrl_dst;
+	int android_control_socket;
+};
+
+
+static void wpa_supplicant_ctrl_iface_send(struct wpa_supplicant *wpa_s,
+					   const char *ifname, int sock,
+					   struct dl_list *ctrl_dst,
 					   int level, const char *buf,
-					   size_t len);
+					   size_t len,
+					   struct ctrl_iface_priv *priv,
+					   struct ctrl_iface_global_priv *gp);
+static int wpas_ctrl_iface_reinit(struct wpa_supplicant *wpa_s,
+				  struct ctrl_iface_priv *priv);
+static int wpas_ctrl_iface_global_reinit(struct wpa_global *global,
+					 struct ctrl_iface_global_priv *priv);
 
 
-static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
+static int wpa_supplicant_ctrl_iface_attach(struct dl_list *ctrl_dst,
 					    struct sockaddr_un *from,
-					    socklen_t fromlen)
+					    socklen_t fromlen, int global)
 {
 	struct wpa_ctrl_dst *dst;
+	char addr_txt[200];
 
 	dst = os_zalloc(sizeof(*dst));
 	if (dst == NULL)
@@ -67,31 +85,36 @@ static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
 	os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
 	dst->addrlen = fromlen;
 	dst->debug_level = MSG_INFO;
-	dl_list_add(&priv->ctrl_dst, &dst->list);
-	wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
-		    (u8 *) from->sun_path,
-		    fromlen - offsetof(struct sockaddr_un, sun_path));
+	dl_list_add(ctrl_dst, &dst->list);
+	printf_encode(addr_txt, sizeof(addr_txt),
+		      (u8 *) from->sun_path,
+		      fromlen - offsetof(struct sockaddr_un, sun_path));
+	wpa_printf(MSG_DEBUG, "CTRL_IFACE %smonitor attached %s",
+		   global ? "global " : "", addr_txt);
 	return 0;
 }
 
 
-static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
+static int wpa_supplicant_ctrl_iface_detach(struct dl_list *ctrl_dst,
 					    struct sockaddr_un *from,
 					    socklen_t fromlen)
 {
 	struct wpa_ctrl_dst *dst;
 
-	dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
+	dl_list_for_each(dst, ctrl_dst, struct wpa_ctrl_dst, list) {
 		if (fromlen == dst->addrlen &&
 		    os_memcmp(from->sun_path, dst->addr.sun_path,
 			      fromlen - offsetof(struct sockaddr_un, sun_path))
 		    == 0) {
+			char addr_txt[200];
+			printf_encode(addr_txt, sizeof(addr_txt),
+				      (u8 *) from->sun_path,
+				      fromlen -
+				      offsetof(struct sockaddr_un, sun_path));
+			wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached %s",
+				   addr_txt);
 			dl_list_del(&dst->list);
 			os_free(dst);
-			wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
-				    (u8 *) from->sun_path,
-				    fromlen -
-				    offsetof(struct sockaddr_un, sun_path));
 			return 0;
 		}
 	}
@@ -113,11 +136,13 @@ static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
 		    os_memcmp(from->sun_path, dst->addr.sun_path,
 			      fromlen - offsetof(struct sockaddr_un, sun_path))
 		    == 0) {
-			wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
-				    "level", (u8 *) from->sun_path,
-				    fromlen -
-				    offsetof(struct sockaddr_un, sun_path));
+			char addr_txt[200];
 			dst->debug_level = atoi(level);
+			printf_encode(addr_txt, sizeof(addr_txt),
+				      (u8 *) from->sun_path, fromlen -
+				      offsetof(struct sockaddr_un, sun_path));
+			wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor level to %d for %s",
+				   dst->debug_level, addr_txt);
 			return 0;
 		}
 	}
@@ -135,27 +160,30 @@ static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 	int res;
 	struct sockaddr_un from;
 	socklen_t fromlen = sizeof(from);
-	char *reply = NULL;
+	char *reply = NULL, *reply_buf = NULL;
 	size_t reply_len = 0;
 	int new_attached = 0;
 
 	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 		       (struct sockaddr *) &from, &fromlen);
 	if (res < 0) {
-		perror("recvfrom(ctrl_iface)");
+		wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
+			   strerror(errno));
 		return;
 	}
 	buf[res] = '\0';
 
 	if (os_strcmp(buf, "ATTACH") == 0) {
-		if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
+		if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
+						     fromlen, 0))
 			reply_len = 1;
 		else {
 			new_attached = 1;
 			reply_len = 2;
 		}
 	} else if (os_strcmp(buf, "DETACH") == 0) {
-		if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
+		if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
+						     fromlen))
 			reply_len = 1;
 		else
 			reply_len = 2;
@@ -166,21 +194,49 @@ static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
 		else
 			reply_len = 2;
 	} else {
-		reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
-							  &reply_len);
+		reply_buf = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
+							      &reply_len);
+		reply = reply_buf;
+	}
+
+	if (!reply && reply_len == 1) {
+		reply = "FAIL\n";
+		reply_len = 5;
+	} else if (!reply && reply_len == 2) {
+		reply = "OK\n";
+		reply_len = 3;
 	}
 
 	if (reply) {
-		sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
-		       fromlen);
-		os_free(reply);
-	} else if (reply_len == 1) {
-		sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
-		       fromlen);
-	} else if (reply_len == 2) {
-		sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
-		       fromlen);
+		if (sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
+			   fromlen) < 0) {
+			int _errno = errno;
+			wpa_dbg(wpa_s, MSG_DEBUG,
+				"ctrl_iface sendto failed: %d - %s",
+				_errno, strerror(_errno));
+			if (_errno == ENOBUFS || _errno == EAGAIN) {
+				/*
+				 * The socket send buffer could be full. This
+				 * may happen if client programs are not
+				 * receiving their pending messages. Close and
+				 * reopen the socket as a workaround to avoid
+				 * getting stuck being unable to send any new
+				 * responses.
+				 */
+				sock = wpas_ctrl_iface_reinit(wpa_s, priv);
+				if (sock < 0) {
+					wpa_dbg(wpa_s, MSG_DEBUG, "Failed to reinitialize ctrl_iface socket");
+				}
+			}
+			if (new_attached) {
+				wpa_dbg(wpa_s, MSG_DEBUG, "Failed to send response to ATTACH - detaching");
+				new_attached = 0;
+				wpa_supplicant_ctrl_iface_detach(
+					&priv->ctrl_dst, &from, fromlen);
+			}
+		}
 	}
+	os_free(reply_buf);
 
 	if (new_attached)
 		eapol_sm_notify_ctrl_attached(wpa_s->eapol);
@@ -191,7 +247,7 @@ static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 {
 	char *buf;
 	size_t len;
-	char *pbuf, *dir = NULL, *gid_str = NULL;
+	char *pbuf, *dir = NULL;
 	int res;
 
 	if (wpa_s->conf->ctrl_interface == NULL)
@@ -201,12 +257,11 @@ static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 	if (pbuf == NULL)
 		return NULL;
 	if (os_strncmp(pbuf, "DIR=", 4) == 0) {
+		char *gid_str;
 		dir = pbuf + 4;
 		gid_str = os_strstr(dir, " GROUP=");
-		if (gid_str) {
+		if (gid_str)
 			*gid_str = '\0';
-			gid_str += 7;
-		}
 	} else
 		dir = pbuf;
 
@@ -218,7 +273,7 @@ static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 	}
 
 	res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
-	if (res < 0 || (size_t) res >= len) {
+	if (os_snprintf_error(len, res)) {
 		os_free(pbuf);
 		os_free(buf);
 		return NULL;
@@ -240,20 +295,38 @@ static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
 }
 
 
-static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
+static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level, int global,
 					     const char *txt, size_t len)
 {
 	struct wpa_supplicant *wpa_s = ctx;
-	if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
+
+	if (wpa_s == NULL)
 		return;
-	wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
+
+	if (global != 2 && wpa_s->global->ctrl_iface) {
+		struct ctrl_iface_global_priv *priv = wpa_s->global->ctrl_iface;
+		if (!dl_list_empty(&priv->ctrl_dst)) {
+			wpa_supplicant_ctrl_iface_send(wpa_s, global ? NULL :
+						       wpa_s->ifname,
+						       priv->sock,
+						       &priv->ctrl_dst,
+						       level, txt, len, NULL,
+						       priv);
+		}
+	}
+
+	if (wpa_s->ctrl_iface == NULL)
+		return;
+	wpa_supplicant_ctrl_iface_send(wpa_s, NULL, wpa_s->ctrl_iface->sock,
+				       &wpa_s->ctrl_iface->ctrl_dst,
+				       level, txt, len, wpa_s->ctrl_iface,
+				       NULL);
 }
 
 
-struct ctrl_iface_priv *
-wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
+static int wpas_ctrl_iface_open_sock(struct wpa_supplicant *wpa_s,
+				     struct ctrl_iface_priv *priv)
 {
-	struct ctrl_iface_priv *priv;
 	struct sockaddr_un addr;
 	char *fname = NULL;
 	gid_t gid = 0;
@@ -263,16 +336,6 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 	char *endp;
 	int flags;
 
-	priv = os_zalloc(sizeof(*priv));
-	if (priv == NULL)
-		return NULL;
-	dl_list_init(&priv->ctrl_dst);
-	priv->wpa_s = wpa_s;
-	priv->sock = -1;
-
-	if (wpa_s->conf->ctrl_interface == NULL)
-		return priv;
-
 	buf = os_strdup(wpa_s->conf->ctrl_interface);
 	if (buf == NULL)
 		goto fail;
@@ -280,8 +343,10 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 	os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
 		    wpa_s->conf->ctrl_interface);
 	priv->sock = android_get_control_socket(addr.sun_path);
-	if (priv->sock >= 0)
+	if (priv->sock >= 0) {
+		priv->android_control_socket = 1;
 		goto havesock;
+	}
 #endif /* ANDROID */
 	if (os_strncmp(buf, "DIR=", 4) == 0) {
 		dir = buf + 4;
@@ -300,7 +365,8 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 			wpa_printf(MSG_DEBUG, "Using existing control "
 				   "interface directory.");
 		} else {
-			perror("mkdir[ctrl_interface]");
+			wpa_printf(MSG_ERROR, "mkdir[ctrl_interface=%s]: %s",
+				   dir, strerror(errno));
 			goto fail;
 		}
 	}
@@ -344,7 +410,8 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 	}
 
 	if (gid_set && chown(dir, -1, gid) < 0) {
-		perror("chown[ctrl_interface]");
+		wpa_printf(MSG_ERROR, "chown[ctrl_interface=%s,gid=%d]: %s",
+			   dir, (int) gid, strerror(errno));
 		goto fail;
 	}
 
@@ -364,7 +431,7 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 
 	priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 	if (priv->sock < 0) {
-		perror("socket(PF_UNIX)");
+		wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
 		goto fail;
 	}
 
@@ -386,15 +453,15 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 				   " allow connections - assuming it was left"
 				   "over from forced program termination");
 			if (unlink(fname) < 0) {
-				perror("unlink[ctrl_iface]");
-				wpa_printf(MSG_ERROR, "Could not unlink "
-					   "existing ctrl_iface socket '%s'",
-					   fname);
+				wpa_printf(MSG_ERROR,
+					   "Could not unlink existing ctrl_iface socket '%s': %s",
+					   fname, strerror(errno));
 				goto fail;
 			}
 			if (bind(priv->sock, (struct sockaddr *) &addr,
 				 sizeof(addr)) < 0) {
-				perror("supp-ctrl-iface-init: bind(PF_UNIX)");
+				wpa_printf(MSG_ERROR, "supp-ctrl-iface-init: bind(PF_UNIX): %s",
+					   strerror(errno));
 				goto fail;
 			}
 			wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
@@ -411,12 +478,14 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 	}
 
 	if (gid_set && chown(fname, -1, gid) < 0) {
-		perror("chown[ctrl_interface/ifname]");
+		wpa_printf(MSG_ERROR, "chown[ctrl_interface=%s,gid=%d]: %s",
+			   fname, (int) gid, strerror(errno));
 		goto fail;
 	}
 
 	if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
-		perror("chmod[ctrl_interface/ifname]");
+		wpa_printf(MSG_ERROR, "chmod[ctrl_interface=%s]: %s",
+			   fname, strerror(errno));
 		goto fail;
 	}
 	os_free(fname);
@@ -433,7 +502,8 @@ havesock:
 	if (flags >= 0) {
 		flags |= O_NONBLOCK;
 		if (fcntl(priv->sock, F_SETFL, flags) < 0) {
-			perror("fcntl(ctrl, O_NONBLOCK)");
+			wpa_printf(MSG_INFO, "fcntl(ctrl, O_NONBLOCK): %s",
+				   strerror(errno));
 			/* Not fatal, continue on.*/
 		}
 	}
@@ -443,18 +513,71 @@ havesock:
 	wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
 
 	os_free(buf);
-	return priv;
+	return 0;
 
 fail:
-	if (priv->sock >= 0)
+	if (priv->sock >= 0) {
 		close(priv->sock);
-	os_free(priv);
+		priv->sock = -1;
+	}
 	if (fname) {
 		unlink(fname);
 		os_free(fname);
 	}
 	os_free(buf);
-	return NULL;
+	return -1;
+}
+
+
+struct ctrl_iface_priv *
+wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
+{
+	struct ctrl_iface_priv *priv;
+
+	priv = os_zalloc(sizeof(*priv));
+	if (priv == NULL)
+		return NULL;
+	dl_list_init(&priv->ctrl_dst);
+	priv->wpa_s = wpa_s;
+	priv->sock = -1;
+
+	if (wpa_s->conf->ctrl_interface == NULL)
+		return priv;
+
+	if (wpas_ctrl_iface_open_sock(wpa_s, priv) < 0) {
+		os_free(priv);
+		return NULL;
+	}
+
+	return priv;
+}
+
+
+static int wpas_ctrl_iface_reinit(struct wpa_supplicant *wpa_s,
+				  struct ctrl_iface_priv *priv)
+{
+	int res;
+
+	if (priv->sock <= 0)
+		return -1;
+
+	/*
+	 * On Android, the control socket being used may be the socket
+	 * that is created when wpa_supplicant is started as a /init.*.rc
+	 * service. Such a socket is maintained as a key-value pair in
+	 * Android's environment. Closing this control socket would leave us
+	 * in a bad state with an invalid socket descriptor.
+	 */
+	if (priv->android_control_socket)
+		return priv->sock;
+
+	eloop_unregister_read_sock(priv->sock);
+	close(priv->sock);
+	priv->sock = -1;
+	res = wpas_ctrl_iface_open_sock(wpa_s, priv);
+	if (res < 0)
+		return -1;
+	return priv->sock;
 }
 
 
@@ -464,17 +587,17 @@ void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 
 	if (priv->sock > -1) {
 		char *fname;
-		char *buf, *dir = NULL, *gid_str = NULL;
+		char *buf, *dir = NULL;
 		eloop_unregister_read_sock(priv->sock);
 		if (!dl_list_empty(&priv->ctrl_dst)) {
 			/*
-			 * Wait a second before closing the control socket if
+			 * Wait before closing the control socket if
 			 * there are any attached monitors in order to allow
 			 * them to receive any pending messages.
 			 */
 			wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
 				   "monitors to receive messages");
-			os_sleep(1, 0);
+			os_sleep(0, 100000);
 		}
 		close(priv->sock);
 		priv->sock = -1;
@@ -484,16 +607,17 @@ void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 			os_free(fname);
 		}
 
+		if (priv->wpa_s->conf->ctrl_interface == NULL)
+			goto free_dst;
 		buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
 		if (buf == NULL)
 			goto free_dst;
 		if (os_strncmp(buf, "DIR=", 4) == 0) {
+			char *gid_str;
 			dir = buf + 4;
 			gid_str = os_strstr(dir, " GROUP=");
-			if (gid_str) {
+			if (gid_str)
 				*gid_str = '\0';
-				gid_str += 7;
-			}
 		} else
 			dir = buf;
 
@@ -503,7 +627,9 @@ void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
 					   "directory not empty - leaving it "
 					   "behind");
 			} else {
-				perror("rmdir[ctrl_interface]");
+				wpa_printf(MSG_ERROR,
+					   "rmdir[ctrl_interface=%s]: %s",
+					   dir, strerror(errno));
 			}
 		}
 		os_free(buf);
@@ -519,63 +645,109 @@ free_dst:
 
 /**
  * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
- * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
+ * @ifname: Interface name for global control socket or %NULL
+ * @sock: Local socket fd
+ * @ctrl_dst: List of attached listeners
  * @level: Priority level of the message
  * @buf: Message data
  * @len: Message length
  *
  * Send a packet to all monitor programs attached to the control interface.
  */
-static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
+static void wpa_supplicant_ctrl_iface_send(struct wpa_supplicant *wpa_s,
+					   const char *ifname, int sock,
+					   struct dl_list *ctrl_dst,
 					   int level, const char *buf,
-					   size_t len)
+					   size_t len,
+					   struct ctrl_iface_priv *priv,
+					   struct ctrl_iface_global_priv *gp)
 {
 	struct wpa_ctrl_dst *dst, *next;
 	char levelstr[10];
 	int idx, res;
 	struct msghdr msg;
-	struct iovec io[2];
+	struct iovec io[5];
 
-	if (priv->sock < 0 || dl_list_empty(&priv->ctrl_dst))
+	if (sock < 0 || dl_list_empty(ctrl_dst))
 		return;
 
 	res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
-	if (res < 0 || (size_t) res >= sizeof(levelstr))
+	if (os_snprintf_error(sizeof(levelstr), res))
 		return;
-	io[0].iov_base = levelstr;
-	io[0].iov_len = os_strlen(levelstr);
-	io[1].iov_base = (char *) buf;
-	io[1].iov_len = len;
+	idx = 0;
+	if (ifname) {
+		io[idx].iov_base = "IFNAME=";
+		io[idx].iov_len = 7;
+		idx++;
+		io[idx].iov_base = (char *) ifname;
+		io[idx].iov_len = os_strlen(ifname);
+		idx++;
+		io[idx].iov_base = " ";
+		io[idx].iov_len = 1;
+		idx++;
+	}
+	io[idx].iov_base = levelstr;
+	io[idx].iov_len = os_strlen(levelstr);
+	idx++;
+	io[idx].iov_base = (char *) buf;
+	io[idx].iov_len = len;
+	idx++;
 	os_memset(&msg, 0, sizeof(msg));
 	msg.msg_iov = io;
-	msg.msg_iovlen = 2;
+	msg.msg_iovlen = idx;
 
-	idx = 0;
-	dl_list_for_each_safe(dst, next, &priv->ctrl_dst, struct wpa_ctrl_dst,
-			      list) {
-		if (level >= dst->debug_level) {
-			wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
-				    (u8 *) dst->addr.sun_path, dst->addrlen -
-				    offsetof(struct sockaddr_un, sun_path));
-			msg.msg_name = (void *) &dst->addr;
-			msg.msg_namelen = dst->addrlen;
-			if (sendmsg(priv->sock, &msg, 0) < 0) {
-				int _errno = errno;
-				wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
-					   "%d - %s",
-					   idx, errno, strerror(errno));
-				dst->errors++;
-				if (dst->errors > 1000 ||
-				    (_errno != ENOBUFS && dst->errors > 10) ||
-				    _errno == ENOENT) {
-					wpa_supplicant_ctrl_iface_detach(
-						priv, &dst->addr,
-						dst->addrlen);
-				}
-			} else
-				dst->errors = 0;
+	dl_list_for_each_safe(dst, next, ctrl_dst, struct wpa_ctrl_dst, list) {
+		int _errno;
+		char addr_txt[200];
+
+		if (level < dst->debug_level)
+			continue;
+
+		printf_encode(addr_txt, sizeof(addr_txt),
+			      (u8 *) dst->addr.sun_path, dst->addrlen -
+			      offsetof(struct sockaddr_un, sun_path));
+		msg.msg_name = (void *) &dst->addr;
+		msg.msg_namelen = dst->addrlen;
+		if (sendmsg(sock, &msg, MSG_DONTWAIT) >= 0) {
+			wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor sent successfully to %s",
+				   addr_txt);
+			dst->errors = 0;
+			continue;
+		}
+
+		_errno = errno;
+		wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor[%s]: %d - %s",
+			   addr_txt, errno, strerror(errno));
+		dst->errors++;
+
+		if (dst->errors > 10 || _errno == ENOENT || _errno == EPERM) {
+			wpa_printf(MSG_INFO, "CTRL_IFACE: Detach monitor %s that cannot receive messages",
+				addr_txt);
+			wpa_supplicant_ctrl_iface_detach(ctrl_dst, &dst->addr,
+							 dst->addrlen);
+		}
+
+		if (_errno == ENOBUFS || _errno == EAGAIN) {
+			/*
+			 * The socket send buffer could be full. This may happen
+			 * if client programs are not receiving their pending
+			 * messages. Close and reopen the socket as a workaround
+			 * to avoid getting stuck being unable to send any new
+			 * responses.
+			 */
+			if (priv)
+				sock = wpas_ctrl_iface_reinit(wpa_s, priv);
+			else if (gp)
+				sock = wpas_ctrl_iface_global_reinit(
+					wpa_s->global, gp);
+			else
+				break;
+			if (sock < 0) {
+				wpa_dbg(wpa_s, MSG_DEBUG,
+					"Failed to reinitialize ctrl_iface socket");
+				break;
+			}
 		}
-		idx++;
 	}
 }
 
@@ -595,27 +767,41 @@ void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 		res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
 			       (struct sockaddr *) &from, &fromlen);
 		if (res < 0) {
-			perror("recvfrom(ctrl_iface)");
+			wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
+				   strerror(errno));
 			continue;
 		}
 		buf[res] = '\0';
 
 		if (os_strcmp(buf, "ATTACH") == 0) {
 			/* handle ATTACH signal of first monitor interface */
-			if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
-							      fromlen)) {
-				sendto(priv->sock, "OK\n", 3, 0,
-				       (struct sockaddr *) &from, fromlen);
+			if (!wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst,
+							      &from, fromlen,
+							      0)) {
+				if (sendto(priv->sock, "OK\n", 3, 0,
+					   (struct sockaddr *) &from, fromlen) <
+				    0) {
+					wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
+						   strerror(errno));
+				}
 				/* OK to continue */
 				return;
 			} else {
-				sendto(priv->sock, "FAIL\n", 5, 0,
-				       (struct sockaddr *) &from, fromlen);
+				if (sendto(priv->sock, "FAIL\n", 5, 0,
+					   (struct sockaddr *) &from, fromlen) <
+				    0) {
+					wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
+						   strerror(errno));
+				}
 			}
 		} else {
 			/* return FAIL for all other signals */
-			sendto(priv->sock, "FAIL\n", 5, 0,
-			       (struct sockaddr *) &from, fromlen);
+			if (sendto(priv->sock, "FAIL\n", 5, 0,
+				   (struct sockaddr *) &from, fromlen) < 0) {
+				wpa_printf(MSG_DEBUG,
+					   "ctrl_iface sendto failed: %s",
+					   strerror(errno));
+			}
 		}
 	}
 }
@@ -623,72 +809,107 @@ void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
 
 /* Global ctrl_iface */
 
-struct ctrl_iface_global_priv {
-	struct wpa_global *global;
-	int sock;
-};
-
-
 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
 						     void *sock_ctx)
 {
 	struct wpa_global *global = eloop_ctx;
-	char buf[256];
+	struct ctrl_iface_global_priv *priv = sock_ctx;
+	char buf[4096];
 	int res;
 	struct sockaddr_un from;
 	socklen_t fromlen = sizeof(from);
-	char *reply;
+	char *reply = NULL, *reply_buf = NULL;
 	size_t reply_len;
 
 	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
 		       (struct sockaddr *) &from, &fromlen);
 	if (res < 0) {
-		perror("recvfrom(ctrl_iface)");
+		wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
+			   strerror(errno));
 		return;
 	}
 	buf[res] = '\0';
 
-	reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
-							 &reply_len);
+	if (os_strcmp(buf, "ATTACH") == 0) {
+		if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
+						     fromlen, 1))
+			reply_len = 1;
+		else
+			reply_len = 2;
+	} else if (os_strcmp(buf, "DETACH") == 0) {
+		if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
+						     fromlen))
+			reply_len = 1;
+		else
+			reply_len = 2;
+	} else {
+		reply_buf = wpa_supplicant_global_ctrl_iface_process(
+			global, buf, &reply_len);
+		reply = reply_buf;
+	}
+
+	if (!reply && reply_len == 1) {
+		reply = "FAIL\n";
+		reply_len = 5;
+	} else if (!reply && reply_len == 2) {
+		reply = "OK\n";
+		reply_len = 3;
+	}
 
 	if (reply) {
-		sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
-		       fromlen);
-		os_free(reply);
-	} else if (reply_len) {
-		sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
-		       fromlen);
+		if (sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
+			   fromlen) < 0) {
+			wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
+				strerror(errno));
+		}
 	}
+	os_free(reply_buf);
 }
 
 
-struct ctrl_iface_global_priv *
-wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
+static int wpas_global_ctrl_iface_open_sock(struct wpa_global *global,
+					    struct ctrl_iface_global_priv *priv)
 {
-	struct ctrl_iface_global_priv *priv;
 	struct sockaddr_un addr;
+	const char *ctrl = global->params.ctrl_interface;
+	int flags;
 
-	priv = os_zalloc(sizeof(*priv));
-	if (priv == NULL)
-		return NULL;
-	priv->global = global;
-	priv->sock = -1;
-
-	if (global->params.ctrl_interface == NULL)
-		return priv;
+	wpa_printf(MSG_DEBUG, "Global control interface '%s'", ctrl);
 
 #ifdef ANDROID
-	priv->sock = android_get_control_socket(global->params.ctrl_interface);
-	if (priv->sock >= 0)
+	if (os_strncmp(ctrl, "@android:", 9) == 0) {
+		priv->sock = android_get_control_socket(ctrl + 9);
+		if (priv->sock < 0) {
+			wpa_printf(MSG_ERROR, "Failed to open Android control "
+				   "socket '%s'", ctrl + 9);
+			goto fail;
+		}
+		wpa_printf(MSG_DEBUG, "Using Android control socket '%s'",
+			   ctrl + 9);
+		priv->android_control_socket = 1;
 		goto havesock;
-#endif /* ANDROID */
+	}
 
-	wpa_printf(MSG_DEBUG, "Global control interface '%s'",
-		   global->params.ctrl_interface);
+	if (os_strncmp(ctrl, "@abstract:", 10) != 0) {
+		/*
+		 * Backwards compatibility - try to open an Android control
+		 * socket and if that fails, assume this was a UNIX domain
+		 * socket instead.
+		 */
+		priv->sock = android_get_control_socket(ctrl);
+		if (priv->sock >= 0) {
+			wpa_printf(MSG_DEBUG,
+				   "Using Android control socket '%s'",
+				   ctrl);
+			priv->android_control_socket = 1;
+			goto havesock;
+		}
+	}
+#endif /* ANDROID */
 
 	priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
 	if (priv->sock < 0) {
-		perror("socket(PF_UNIX)");
+		wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
 		goto fail;
 	}
 
@@ -697,66 +918,203 @@ wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 	addr.sun_len = sizeof(addr);
 #endif /* __FreeBSD__ */
 	addr.sun_family = AF_UNIX;
-	os_strlcpy(addr.sun_path, global->params.ctrl_interface,
-		   sizeof(addr.sun_path));
+
+	if (os_strncmp(ctrl, "@abstract:", 10) == 0) {
+		addr.sun_path[0] = '\0';
+		os_strlcpy(addr.sun_path + 1, ctrl + 10,
+			   sizeof(addr.sun_path) - 1);
+		if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) <
+		    0) {
+			wpa_printf(MSG_ERROR, "supp-global-ctrl-iface-init: "
+				   "bind(PF_UNIX;%s) failed: %s",
+				   ctrl, strerror(errno));
+			goto fail;
+		}
+		wpa_printf(MSG_DEBUG, "Using Abstract control socket '%s'",
+			   ctrl + 10);
+		goto havesock;
+	}
+
+	os_strlcpy(addr.sun_path, ctrl, sizeof(addr.sun_path));
 	if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
-		perror("supp-global-ctrl-iface-init (will try fixup): "
-		       "bind(PF_UNIX)");
+		wpa_printf(MSG_INFO, "supp-global-ctrl-iface-init(%s) (will try fixup): bind(PF_UNIX): %s",
+			   ctrl, strerror(errno));
 		if (connect(priv->sock, (struct sockaddr *) &addr,
 			    sizeof(addr)) < 0) {
 			wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
 				   " allow connections - assuming it was left"
 				   "over from forced program termination");
-			if (unlink(global->params.ctrl_interface) < 0) {
-				perror("unlink[ctrl_iface]");
-				wpa_printf(MSG_ERROR, "Could not unlink "
-					   "existing ctrl_iface socket '%s'",
-					   global->params.ctrl_interface);
+			if (unlink(ctrl) < 0) {
+				wpa_printf(MSG_ERROR,
+					   "Could not unlink existing ctrl_iface socket '%s': %s",
+					   ctrl, strerror(errno));
 				goto fail;
 			}
 			if (bind(priv->sock, (struct sockaddr *) &addr,
 				 sizeof(addr)) < 0) {
-				perror("supp-glb-iface-init: bind(PF_UNIX)");
+				wpa_printf(MSG_ERROR, "supp-glb-iface-init: bind(PF_UNIX;%s): %s",
+					   ctrl, strerror(errno));
 				goto fail;
 			}
 			wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
 				   "ctrl_iface socket '%s'",
-				   global->params.ctrl_interface);
+				   ctrl);
 		} else {
 			wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
 				   "be in use - cannot override it");
 			wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
 				   "not used anymore",
-				   global->params.ctrl_interface);
+				   ctrl);
 			goto fail;
 		}
 	}
 
-#ifdef ANDROID
+	wpa_printf(MSG_DEBUG, "Using UNIX control socket '%s'", ctrl);
+
+	if (global->params.ctrl_interface_group) {
+		char *gid_str = global->params.ctrl_interface_group;
+		gid_t gid = 0;
+		struct group *grp;
+		char *endp;
+
+		grp = getgrnam(gid_str);
+		if (grp) {
+			gid = grp->gr_gid;
+			wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
+				   " (from group name '%s')",
+				   (int) gid, gid_str);
+		} else {
+			/* Group name not found - try to parse this as gid */
+			gid = strtol(gid_str, &endp, 10);
+			if (*gid_str == '\0' || *endp != '\0') {
+				wpa_printf(MSG_ERROR, "CTRL: Invalid group "
+					   "'%s'", gid_str);
+				goto fail;
+			}
+			wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
+				   (int) gid);
+		}
+		if (chown(ctrl, -1, gid) < 0) {
+			wpa_printf(MSG_ERROR,
+				   "chown[global_ctrl_interface=%s,gid=%d]: %s",
+				   ctrl, (int) gid, strerror(errno));
+			goto fail;
+		}
+
+		if (chmod(ctrl, S_IRWXU | S_IRWXG) < 0) {
+			wpa_printf(MSG_ERROR,
+				   "chmod[global_ctrl_interface=%s]: %s",
+				   ctrl, strerror(errno));
+			goto fail;
+		}
+	} else {
+		if (chmod(ctrl, S_IRWXU) < 0) {
+			wpa_printf(MSG_DEBUG,
+				   "chmod[global_ctrl_interface=%s](S_IRWXU): %s",
+				   ctrl, strerror(errno));
+			/* continue anyway since group change was not required
+			 */
+		}
+	}
+
 havesock:
-#endif /* ANDROID */
+
+	/*
+	 * Make socket non-blocking so that we don't hang forever if
+	 * target dies unexpectedly.
+	 */
+	flags = fcntl(priv->sock, F_GETFL);
+	if (flags >= 0) {
+		flags |= O_NONBLOCK;
+		if (fcntl(priv->sock, F_SETFL, flags) < 0) {
+			wpa_printf(MSG_INFO, "fcntl(ctrl, O_NONBLOCK): %s",
+				   strerror(errno));
+			/* Not fatal, continue on.*/
+		}
+	}
+
 	eloop_register_read_sock(priv->sock,
 				 wpa_supplicant_global_ctrl_iface_receive,
-				 global, NULL);
+				 global, priv);
 
-	return priv;
+	return 0;
 
 fail:
-	if (priv->sock >= 0)
+	if (priv->sock >= 0) {
 		close(priv->sock);
-	os_free(priv);
-	return NULL;
+		priv->sock = -1;
+	}
+	return -1;
+}
+
+
+struct ctrl_iface_global_priv *
+wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
+{
+	struct ctrl_iface_global_priv *priv;
+
+	priv = os_zalloc(sizeof(*priv));
+	if (priv == NULL)
+		return NULL;
+	dl_list_init(&priv->ctrl_dst);
+	priv->global = global;
+	priv->sock = -1;
+
+	if (global->params.ctrl_interface == NULL)
+		return priv;
+
+	if (wpas_global_ctrl_iface_open_sock(global, priv) < 0) {
+		os_free(priv);
+		return NULL;
+	}
+
+	wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
+
+	return priv;
+}
+
+
+static int wpas_ctrl_iface_global_reinit(struct wpa_global *global,
+					 struct ctrl_iface_global_priv *priv)
+{
+	int res;
+
+	if (priv->sock <= 0)
+		return -1;
+
+	/*
+	 * On Android, the control socket being used may be the socket
+	 * that is created when wpa_supplicant is started as a /init.*.rc
+	 * service. Such a socket is maintained as a key-value pair in
+	 * Android's environment. Closing this control socket would leave us
+	 * in a bad state with an invalid socket descriptor.
+	 */
+	if (priv->android_control_socket)
+		return priv->sock;
+
+	eloop_unregister_read_sock(priv->sock);
+	close(priv->sock);
+	priv->sock = -1;
+	res = wpas_global_ctrl_iface_open_sock(global, priv);
+	if (res < 0)
+		return -1;
+	return priv->sock;
 }
 
 
 void
 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
 {
+	struct wpa_ctrl_dst *dst, *prev;
+
 	if (priv->sock >= 0) {
 		eloop_unregister_read_sock(priv->sock);
 		close(priv->sock);
 	}
 	if (priv->global->params.ctrl_interface)
 		unlink(priv->global->params.ctrl_interface);
+	dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
+			      list)
+		os_free(dst);
 	os_free(priv);
 }