[thirdparty/hostap.git] / wpa_supplicant / ctrl_iface_unix.c

/*
 * WPA Supplicant / UNIX domain socket -based control interface
 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"
#include <sys/un.h>
#include <sys/stat.h>
#include <grp.h>
#include <stddef.h>
#ifdef ANDROID
#include <cutils/sockets.h>
#endif /* ANDROID */

#include "utils/common.h"
#include "utils/eloop.h"
#include "utils/list.h"
#include "eapol_supp/eapol_supp_sm.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "ctrl_iface.h"

/* Per-interface ctrl_iface */

/**
 * struct wpa_ctrl_dst - Internal data structure of control interface monitors
 *
 * This structure is used to store information about registered control
 * interface monitors into struct wpa_supplicant. This data is private to
 * ctrl_iface_unix.c and should not be touched directly from other files.
 */
struct wpa_ctrl_dst {
	struct dl_list list;
	struct sockaddr_un addr;
	socklen_t addrlen;
	int debug_level;
	int errors;
};


struct ctrl_iface_priv {
	struct wpa_supplicant *wpa_s;
	int sock;
	struct dl_list ctrl_dst;
};


static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
					   int level, const char *buf,
					   size_t len);


static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
					    struct sockaddr_un *from,
					    socklen_t fromlen)
{
	struct wpa_ctrl_dst *dst;

	dst = os_zalloc(sizeof(*dst));
	if (dst == NULL)
		return -1;
	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));
	return 0;
}


static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
					    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) {
		if (fromlen == dst->addrlen &&
		    os_memcmp(from->sun_path, dst->addr.sun_path,
			      fromlen - offsetof(struct sockaddr_un, sun_path))
		    == 0) {
			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;
		}
	}
	return -1;
}


static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
					   struct sockaddr_un *from,
					   socklen_t fromlen,
					   char *level)
{
	struct wpa_ctrl_dst *dst;

	wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);

	dl_list_for_each(dst, &priv->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) {
			wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
				    "level", (u8 *) from->sun_path,
				    fromlen -
				    offsetof(struct sockaddr_un, sun_path));
			dst->debug_level = atoi(level);
			return 0;
		}
	}

	return -1;
}


static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
					      void *sock_ctx)
{
	struct wpa_supplicant *wpa_s = eloop_ctx;
	struct ctrl_iface_priv *priv = sock_ctx;
	char buf[4096];
	int res;
	struct sockaddr_un from;
	socklen_t fromlen = sizeof(from);
	char *reply = 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)");
		return;
	}
	buf[res] = '\0';

	if (os_strcmp(buf, "ATTACH") == 0) {
		if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
			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))
			reply_len = 1;
		else
			reply_len = 2;
	} else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
		if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
						    buf + 6))
			reply_len = 1;
		else
			reply_len = 2;
	} else {
		reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
							  &reply_len);
	}

	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 (new_attached)
		eapol_sm_notify_ctrl_attached(wpa_s->eapol);
}


static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
{
	char *buf;
	size_t len;
	char *pbuf, *dir = NULL, *gid_str = NULL;
	int res;

	if (wpa_s->conf->ctrl_interface == NULL)
		return NULL;

	pbuf = os_strdup(wpa_s->conf->ctrl_interface);
	if (pbuf == NULL)
		return NULL;
	if (os_strncmp(pbuf, "DIR=", 4) == 0) {
		dir = pbuf + 4;
		gid_str = os_strstr(dir, " GROUP=");
		if (gid_str) {
			*gid_str = '\0';
			gid_str += 7;
		}
	} else
		dir = pbuf;

	len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
	buf = os_malloc(len);
	if (buf == NULL) {
		os_free(pbuf);
		return NULL;
	}

	res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
	if (res < 0 || (size_t) res >= len) {
		os_free(pbuf);
		os_free(buf);
		return NULL;
	}
#ifdef __CYGWIN__
	{
		/* Windows/WinPcap uses interface names that are not suitable
		 * as a file name - convert invalid chars to underscores */
		char *pos = buf;
		while (*pos) {
			if (*pos == '\\')
				*pos = '_';
			pos++;
		}
	}
#endif /* __CYGWIN__ */
	os_free(pbuf);
	return buf;
}


static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
					     const char *txt, size_t len)
{
	struct wpa_supplicant *wpa_s = ctx;
	if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
		return;
	wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
}


struct ctrl_iface_priv *
wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
{
	struct ctrl_iface_priv *priv;
	struct sockaddr_un addr;
	char *fname = NULL;
	gid_t gid = 0;
	int gid_set = 0;
	char *buf, *dir = NULL, *gid_str = NULL;
	struct group *grp;
	char *endp;

	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;
#ifdef ANDROID
	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)
		goto havesock;
#endif /* ANDROID */
	if (os_strncmp(buf, "DIR=", 4) == 0) {
		dir = buf + 4;
		gid_str = os_strstr(dir, " GROUP=");
		if (gid_str) {
			*gid_str = '\0';
			gid_str += 7;
		}
	} else {
		dir = buf;
		gid_str = wpa_s->conf->ctrl_interface_group;
	}

	if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
		if (errno == EEXIST) {
			wpa_printf(MSG_DEBUG, "Using existing control "
				   "interface directory.");
		} else {
			perror("mkdir[ctrl_interface]");
			goto fail;
		}
	}

	if (gid_str) {
		grp = getgrnam(gid_str);
		if (grp) {
			gid = grp->gr_gid;
			gid_set = 1;
			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;
			}
			gid_set = 1;
			wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
				   (int) gid);
		}
	}

	if (gid_set && chown(dir, -1, gid) < 0) {
		perror("chown[ctrl_interface]");
		goto fail;
	}

	/* Make sure the group can enter and read the directory */
	if (gid_set &&
	    chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
		wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
			   strerror(errno));
		goto fail;
	}

	if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
	    sizeof(addr.sun_path)) {
		wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
		goto fail;
	}

	priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
	if (priv->sock < 0) {
		perror("socket(PF_UNIX)");
		goto fail;
	}

	os_memset(&addr, 0, sizeof(addr));
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
	addr.sun_len = sizeof(addr);
#endif /* __FreeBSD__ */
	addr.sun_family = AF_UNIX;
	fname = wpa_supplicant_ctrl_iface_path(wpa_s);
	if (fname == NULL)
		goto fail;
	os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
	if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
			   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(fname) < 0) {
				perror("unlink[ctrl_iface]");
				wpa_printf(MSG_ERROR, "Could not unlink "
					   "existing ctrl_iface socket '%s'",
					   fname);
				goto fail;
			}
			if (bind(priv->sock, (struct sockaddr *) &addr,
				 sizeof(addr)) < 0) {
				perror("bind(PF_UNIX)");
				goto fail;
			}
			wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
				   "ctrl_iface socket '%s'", fname);
		} 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", fname);
			os_free(fname);
			fname = NULL;
			goto fail;
		}
	}

	if (gid_set && chown(fname, -1, gid) < 0) {
		perror("chown[ctrl_interface/ifname]");
		goto fail;
	}

	if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
		perror("chmod[ctrl_interface/ifname]");
		goto fail;
	}
	os_free(fname);

#ifdef ANDROID
havesock:
#endif /* ANDROID */
	eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
				 wpa_s, priv);
	wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);

	os_free(buf);
	return priv;

fail:
	if (priv->sock >= 0)
		close(priv->sock);
	os_free(priv);
	if (fname) {
		unlink(fname);
		os_free(fname);
	}
	os_free(buf);
	return NULL;
}


void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
{
	struct wpa_ctrl_dst *dst, *prev;

	if (priv->sock > -1) {
		char *fname;
		char *buf, *dir = NULL, *gid_str = NULL;
		eloop_unregister_read_sock(priv->sock);
		if (!dl_list_empty(&priv->ctrl_dst)) {
			/*
			 * Wait a second 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);
		}
		close(priv->sock);
		priv->sock = -1;
		fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
		if (fname) {
			unlink(fname);
			os_free(fname);
		}

		buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
		if (buf == NULL)
			goto free_dst;
		if (os_strncmp(buf, "DIR=", 4) == 0) {
			dir = buf + 4;
			gid_str = os_strstr(dir, " GROUP=");
			if (gid_str) {
				*gid_str = '\0';
				gid_str += 7;
			}
		} else
			dir = buf;

		if (rmdir(dir) < 0) {
			if (errno == ENOTEMPTY) {
				wpa_printf(MSG_DEBUG, "Control interface "
					   "directory not empty - leaving it "
					   "behind");
			} else {
				perror("rmdir[ctrl_interface]");
			}
		}
		os_free(buf);
	}

free_dst:
	dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
			      list)
		os_free(dst);
	os_free(priv);
}


/**
 * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
 * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
 * @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,
					   int level, const char *buf,
					   size_t len)
{
	struct wpa_ctrl_dst *dst, *next;
	char levelstr[10];
	int idx, res;
	struct msghdr msg;
	struct iovec io[2];

	if (priv->sock < 0 || dl_list_empty(&priv->ctrl_dst))
		return;

	res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
	if (res < 0 || (size_t) res >= sizeof(levelstr))
		return;
	io[0].iov_base = levelstr;
	io[0].iov_len = os_strlen(levelstr);
	io[1].iov_base = (char *) buf;
	io[1].iov_len = len;
	os_memset(&msg, 0, sizeof(msg));
	msg.msg_iov = io;
	msg.msg_iovlen = 2;

	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;
		}
		idx++;
	}
}


void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
{
	char buf[256];
	int res;
	struct sockaddr_un from;
	socklen_t fromlen = sizeof(from);

	for (;;) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
			   "attach", priv->wpa_s->ifname);
		eloop_wait_for_read_sock(priv->sock);

		res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
			       (struct sockaddr *) &from, &fromlen);
		if (res < 0) {
			perror("recvfrom(ctrl_iface)");
			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);
				/* OK to continue */
				return;
			} else {
				sendto(priv->sock, "FAIL\n", 5, 0,
				       (struct sockaddr *) &from, fromlen);
			}
		} else {
			/* return FAIL for all other signals */
			sendto(priv->sock, "FAIL\n", 5, 0,
			       (struct sockaddr *) &from, fromlen);
		}
	}
}


/* 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];
	int res;
	struct sockaddr_un from;
	socklen_t fromlen = sizeof(from);
	char *reply;
	size_t reply_len;

	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
		       (struct sockaddr *) &from, &fromlen);
	if (res < 0) {
		perror("recvfrom(ctrl_iface)");
		return;
	}
	buf[res] = '\0';

	reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
							 &reply_len);

	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);
	}
}


struct ctrl_iface_global_priv *
wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
{
	struct ctrl_iface_global_priv *priv;
	struct sockaddr_un addr;

	priv = os_zalloc(sizeof(*priv));
	if (priv == NULL)
		return NULL;
	priv->global = global;
	priv->sock = -1;

	if (global->params.ctrl_interface == NULL)
		return priv;

#ifdef ANDROID
	priv->sock = android_get_control_socket(global->params.ctrl_interface);
	if (priv->sock >= 0)
		goto havesock;
#endif /* ANDROID */

	wpa_printf(MSG_DEBUG, "Global control interface '%s'",
		   global->params.ctrl_interface);

	priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
	if (priv->sock < 0) {
		perror("socket(PF_UNIX)");
		goto fail;
	}

	os_memset(&addr, 0, sizeof(addr));
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
	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 (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
		perror("bind(PF_UNIX)");
		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);
				goto fail;
			}
			if (bind(priv->sock, (struct sockaddr *) &addr,
				 sizeof(addr)) < 0) {
				perror("bind(PF_UNIX)");
				goto fail;
			}
			wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
				   "ctrl_iface socket '%s'",
				   global->params.ctrl_interface);
		} 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);
			goto fail;
		}
	}

#ifdef ANDROID
havesock:
#endif /* ANDROID */
	eloop_register_read_sock(priv->sock,
				 wpa_supplicant_global_ctrl_iface_receive,
				 global, NULL);

	return priv;

fail:
	if (priv->sock >= 0)
		close(priv->sock);
	os_free(priv);
	return NULL;
}


void
wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
{
	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);
	os_free(priv);
}
Commit	Line	Data
6fc6879b JM	1	/*
6fc6879b JM	2	* WPA Supplicant / UNIX domain socket -based control interface
09e47a07	3	* Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
6fc6879b JM	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* Alternatively, this software may be distributed under the terms of BSD
	10	* license.
	11	*
	12	* See README and COPYING for more details.
	13	*/
	14
	15	#include "includes.h"
	16	#include <sys/un.h>
	17	#include <sys/stat.h>
	18	#include <grp.h>
19b9436c	19	#include <stddef.h>
b3f3865e DS	20	#ifdef ANDROID
	21	#include <cutils/sockets.h>
	22	#endif /* ANDROID */
6fc6879b	23
09e47a07 JM	24	#include "utils/common.h"
	25	#include "utils/eloop.h"
	26	#include "utils/list.h"
6fc6879b	27	#include "eapol_supp/eapol_supp_sm.h"
09e47a07	28	#include "config.h"
6fc6879b JM	29	#include "wpa_supplicant_i.h"
	30	#include "ctrl_iface.h"
	31
	32	/* Per-interface ctrl_iface */
	33
	34	/**
	35	* struct wpa_ctrl_dst - Internal data structure of control interface monitors
	36	*
	37	* This structure is used to store information about registered control
	38	* interface monitors into struct wpa_supplicant. This data is private to
	39	* ctrl_iface_unix.c and should not be touched directly from other files.
	40	*/
	41	struct wpa_ctrl_dst {
09e47a07	42	struct dl_list list;
6fc6879b JM	43	struct sockaddr_un addr;
	44	socklen_t addrlen;
	45	int debug_level;
	46	int errors;
	47	};
	48
	49
	50	struct ctrl_iface_priv {
	51	struct wpa_supplicant *wpa_s;
	52	int sock;
09e47a07	53	struct dl_list ctrl_dst;
6fc6879b JM	54	};
	55
	56
	57	static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
	58	int level, const char *buf,
	59	size_t len);
	60
	61
	62	static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
	63	struct sockaddr_un *from,
	64	socklen_t fromlen)
	65	{
	66	struct wpa_ctrl_dst *dst;
	67
	68	dst = os_zalloc(sizeof(*dst));
	69	if (dst == NULL)
	70	return -1;
	71	os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
	72	dst->addrlen = fromlen;
	73	dst->debug_level = MSG_INFO;
09e47a07	74	dl_list_add(&priv->ctrl_dst, &dst->list);
6fc6879b	75	wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
19b9436c SL	76	(u8 *) from->sun_path,
19b9436c SL	77	fromlen - offsetof(struct sockaddr_un, sun_path));
6fc6879b JM	78	return 0;
	79	}
	80
	81
	82	static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
	83	struct sockaddr_un *from,
	84	socklen_t fromlen)
	85	{
09e47a07	86	struct wpa_ctrl_dst *dst;
6fc6879b	87
09e47a07	88	dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
6fc6879b JM	89	if (fromlen == dst->addrlen &&
6fc6879b JM	90	os_memcmp(from->sun_path, dst->addr.sun_path,
19b9436c SL	91	fromlen - offsetof(struct sockaddr_un, sun_path))
19b9436c SL	92	== 0) {
09e47a07	93	dl_list_del(&dst->list);
6fc6879b JM	94	os_free(dst);
	95	wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
	96	(u8 *) from->sun_path,
19b9436c SL	97	fromlen -
19b9436c SL	98	offsetof(struct sockaddr_un, sun_path));
6fc6879b JM	99	return 0;
6fc6879b JM	100	}
6fc6879b JM	101	}
	102	return -1;
	103	}
	104
	105
	106	static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
	107	struct sockaddr_un *from,
	108	socklen_t fromlen,
	109	char *level)
	110	{
	111	struct wpa_ctrl_dst *dst;
	112
	113	wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
	114
09e47a07	115	dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
6fc6879b JM	116	if (fromlen == dst->addrlen &&
6fc6879b JM	117	os_memcmp(from->sun_path, dst->addr.sun_path,
19b9436c SL	118	fromlen - offsetof(struct sockaddr_un, sun_path))
19b9436c SL	119	== 0) {
6fc6879b JM	120	wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
6fc6879b JM	121	"level", (u8 *) from->sun_path,
19b9436c SL	122	fromlen -
19b9436c SL	123	offsetof(struct sockaddr_un, sun_path));
6fc6879b JM	124	dst->debug_level = atoi(level);
	125	return 0;
	126	}
6fc6879b JM	127	}
	128
	129	return -1;
	130	}
	131
	132
	133	static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
	134	void *sock_ctx)
	135	{
	136	struct wpa_supplicant *wpa_s = eloop_ctx;
	137	struct ctrl_iface_priv *priv = sock_ctx;
b563b388	138	char buf[4096];
6fc6879b JM	139	int res;
	140	struct sockaddr_un from;
	141	socklen_t fromlen = sizeof(from);
	142	char *reply = NULL;
	143	size_t reply_len = 0;
	144	int new_attached = 0;
	145
	146	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
	147	(struct sockaddr *) &from, &fromlen);
	148	if (res < 0) {
	149	perror("recvfrom(ctrl_iface)");
	150	return;
	151	}
	152	buf[res] = '\0';
	153
	154	if (os_strcmp(buf, "ATTACH") == 0) {
	155	if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
	156	reply_len = 1;
	157	else {
	158	new_attached = 1;
	159	reply_len = 2;
	160	}
	161	} else if (os_strcmp(buf, "DETACH") == 0) {
	162	if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
	163	reply_len = 1;
	164	else
	165	reply_len = 2;
	166	} else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
	167	if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
	168	buf + 6))
	169	reply_len = 1;
	170	else
	171	reply_len = 2;
	172	} else {
	173	reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
	174	&reply_len);
	175	}
	176
	177	if (reply) {
	178	sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
	179	fromlen);
	180	os_free(reply);
	181	} else if (reply_len == 1) {
	182	sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
	183	fromlen);
	184	} else if (reply_len == 2) {
	185	sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
	186	fromlen);
	187	}
	188
	189	if (new_attached)
	190	eapol_sm_notify_ctrl_attached(wpa_s->eapol);
	191	}
	192
	193
	194	static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
	195	{
	196	char *buf;
	197	size_t len;
	198	char pbuf, dir = NULL, *gid_str = NULL;
	199	int res;
	200
	201	if (wpa_s->conf->ctrl_interface == NULL)
	202	return NULL;
203
204	pbuf = os_strdup(wpa_s->conf->ctrl_interface);
205	if (pbuf == NULL)
206	return NULL;
207	if (os_strncmp(pbuf, "DIR=", 4) == 0) {
208	dir = pbuf + 4;
209	gid_str = os_strstr(dir, " GROUP=");
210	if (gid_str) {
211	*gid_str = '\0';
212	gid_str += 7;
213	}
214	} else
215	dir = pbuf;
216
217	len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
218	buf = os_malloc(len);
219	if (buf == NULL) {
220	os_free(pbuf);
221	return NULL;
222	}
223
224	res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
225	if (res < 0 \|\| (size_t) res >= len) {
226	os_free(pbuf);
227	os_free(buf);
228	return NULL;
229	}
230	#ifdef __CYGWIN__
231	{
232	/* Windows/WinPcap uses interface names that are not suitable
233	* as a file name - convert invalid chars to underscores */
234	char *pos = buf;
235	while (*pos) {
236	if (*pos == '\\')
237	*pos = '_';
238	pos++;
239	}
240	}
241	#endif /* __CYGWIN__ */
242	os_free(pbuf);
243	return buf;
244	}
245
246
247	static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
248	const char *txt, size_t len)
249	{
250	struct wpa_supplicant *wpa_s = ctx;
251	if (wpa_s == NULL \|\| wpa_s->ctrl_iface == NULL)
252	return;
253	wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
254	}
255
256
257	struct ctrl_iface_priv *
258	wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
259	{
260	struct ctrl_iface_priv *priv;
261	struct sockaddr_un addr;
262	char *fname = NULL;
263	gid_t gid = 0;
264	int gid_set = 0;
265	char buf, dir = NULL, *gid_str = NULL;
266	struct group *grp;
267	char *endp;
268
269	priv = os_zalloc(sizeof(*priv));
270	if (priv == NULL)
271	return NULL;
09e47a07	272	dl_list_init(&priv->ctrl_dst);
6fc6879b JM	273	priv->wpa_s = wpa_s;
	274	priv->sock = -1;
	275
	276	if (wpa_s->conf->ctrl_interface == NULL)
	277	return priv;
	278
	279	buf = os_strdup(wpa_s->conf->ctrl_interface);
	280	if (buf == NULL)
	281	goto fail;
b3f3865e DS	282	#ifdef ANDROID
	283	os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
	284	wpa_s->conf->ctrl_interface);
	285	priv->sock = android_get_control_socket(addr.sun_path);
	286	if (priv->sock >= 0)
	287	goto havesock;
	288	#endif /* ANDROID */
6fc6879b JM	289	if (os_strncmp(buf, "DIR=", 4) == 0) {
	290	dir = buf + 4;
	291	gid_str = os_strstr(dir, " GROUP=");
	292	if (gid_str) {
	293	*gid_str = '\0';
	294	gid_str += 7;
	295	}
	296	} else {
	297	dir = buf;
	298	gid_str = wpa_s->conf->ctrl_interface_group;
	299	}
	300
	301	if (mkdir(dir, S_IRWXU \| S_IRWXG) < 0) {
	302	if (errno == EEXIST) {
	303	wpa_printf(MSG_DEBUG, "Using existing control "
	304	"interface directory.");
	305	} else {
	306	perror("mkdir[ctrl_interface]");
	307	goto fail;
	308	}
	309	}
	310
	311	if (gid_str) {
	312	grp = getgrnam(gid_str);
	313	if (grp) {
	314	gid = grp->gr_gid;
	315	gid_set = 1;
	316	wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
	317	" (from group name '%s')",
	318	(int) gid, gid_str);
	319	} else {
	320	/* Group name not found - try to parse this as gid */
	321	gid = strtol(gid_str, &endp, 10);
	322	if (gid_str == '\0' \|\| endp != '\0') {
8e888179	323	wpa_printf(MSG_ERROR, "CTRL: Invalid group "
6fc6879b JM	324	"'%s'", gid_str);
	325	goto fail;
	326	}
	327	gid_set = 1;
	328	wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
	329	(int) gid);
	330	}
	331	}
	332
	333	if (gid_set && chown(dir, -1, gid) < 0) {
	334	perror("chown[ctrl_interface]");
	335	goto fail;
	336	}
	337
3fd2a226 AAS	338	/* Make sure the group can enter and read the directory */
	339	if (gid_set &&
	340	chmod(dir, S_IRUSR \| S_IWUSR \| S_IXUSR \| S_IRGRP \| S_IXGRP) < 0) {
	341	wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
	342	strerror(errno));
	343	goto fail;
	344	}
	345
6fc6879b JM	346	if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
	347	sizeof(addr.sun_path)) {
	348	wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
	349	goto fail;
	350	}
	351
	352	priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
	353	if (priv->sock < 0) {
	354	perror("socket(PF_UNIX)");
	355	goto fail;
	356	}
	357
	358	os_memset(&addr, 0, sizeof(addr));
09bd6e8c	359	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
19b9436c SL	360	addr.sun_len = sizeof(addr);
19b9436c SL	361	#endif /* __FreeBSD__ */
6fc6879b JM	362	addr.sun_family = AF_UNIX;
	363	fname = wpa_supplicant_ctrl_iface_path(wpa_s);
	364	if (fname == NULL)
	365	goto fail;
	366	os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
	367	if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
	368	wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
	369	strerror(errno));
	370	if (connect(priv->sock, (struct sockaddr *) &addr,
	371	sizeof(addr)) < 0) {
	372	wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
	373	" allow connections - assuming it was left"
	374	"over from forced program termination");
	375	if (unlink(fname) < 0) {
	376	perror("unlink[ctrl_iface]");
	377	wpa_printf(MSG_ERROR, "Could not unlink "
	378	"existing ctrl_iface socket '%s'",
	379	fname);
	380	goto fail;
	381	}
	382	if (bind(priv->sock, (struct sockaddr *) &addr,
	383	sizeof(addr)) < 0) {
	384	perror("bind(PF_UNIX)");
	385	goto fail;
	386	}
	387	wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
	388	"ctrl_iface socket '%s'", fname);
	389	} else {
	390	wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
	391	"be in use - cannot override it");
	392	wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
	393	"not used anymore", fname);
	394	os_free(fname);
	395	fname = NULL;
	396	goto fail;
	397	}
	398	}
	399
	400	if (gid_set && chown(fname, -1, gid) < 0) {
	401	perror("chown[ctrl_interface/ifname]");
	402	goto fail;
	403	}
	404
	405	if (chmod(fname, S_IRWXU \| S_IRWXG) < 0) {
	406	perror("chmod[ctrl_interface/ifname]");
	407	goto fail;
	408	}
	409	os_free(fname);
	410
b3f3865e DS	411	#ifdef ANDROID
	412	havesock:
	413	#endif /* ANDROID */
6fc6879b JM	414	eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
	415	wpa_s, priv);
	416	wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
	417
	418	os_free(buf);
	419	return priv;
	420
	421	fail:
	422	if (priv->sock >= 0)
	423	close(priv->sock);
	424	os_free(priv);
	425	if (fname) {
	426	unlink(fname);
	427	os_free(fname);
	428	}
	429	os_free(buf);
	430	return NULL;
	431	}
	432
	433
	434	void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
	435	{
	436	struct wpa_ctrl_dst dst, prev;
	437
	438	if (priv->sock > -1) {
	439	char *fname;
	440	char buf, dir = NULL, *gid_str = NULL;
	441	eloop_unregister_read_sock(priv->sock);
09e47a07	442	if (!dl_list_empty(&priv->ctrl_dst)) {
6fc6879b JM	443	/*
	444	* Wait a second before closing the control socket if
	445	* there are any attached monitors in order to allow
	446	* them to receive any pending messages.
	447	*/
	448	wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
	449	"monitors to receive messages");
	450	os_sleep(1, 0);
	451	}
	452	close(priv->sock);
	453	priv->sock = -1;
	454	fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
	455	if (fname) {
	456	unlink(fname);
	457	os_free(fname);
	458	}
	459
	460	buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
	461	if (buf == NULL)
	462	goto free_dst;
	463	if (os_strncmp(buf, "DIR=", 4) == 0) {
	464	dir = buf + 4;
	465	gid_str = os_strstr(dir, " GROUP=");
	466	if (gid_str) {
	467	*gid_str = '\0';
	468	gid_str += 7;
	469	}
	470	} else
	471	dir = buf;
	472
	473	if (rmdir(dir) < 0) {
	474	if (errno == ENOTEMPTY) {
	475	wpa_printf(MSG_DEBUG, "Control interface "
	476	"directory not empty - leaving it "
	477	"behind");
	478	} else {
	479	perror("rmdir[ctrl_interface]");
	480	}
	481	}
	482	os_free(buf);
	483	}
	484
	485	free_dst:
09e47a07 JM	486	dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
	487	list)
	488	os_free(dst);
6fc6879b JM	489	os_free(priv);
	490	}
	491
	492
	493	/**
	494	* wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
	495	* @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
	496	* @level: Priority level of the message
	497	* @buf: Message data
	498	* @len: Message length
	499	*
	500	* Send a packet to all monitor programs attached to the control interface.
	501	*/
	502	static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
	503	int level, const char *buf,
	504	size_t len)
	505	{
	506	struct wpa_ctrl_dst dst, next;
	507	char levelstr[10];
	508	int idx, res;
	509	struct msghdr msg;
	510	struct iovec io[2];
	511
09e47a07	512	if (priv->sock < 0 \|\| dl_list_empty(&priv->ctrl_dst))
6fc6879b JM	513	return;
	514
	515	res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
	516	if (res < 0 \|\| (size_t) res >= sizeof(levelstr))
	517	return;
	518	io[0].iov_base = levelstr;
	519	io[0].iov_len = os_strlen(levelstr);
	520	io[1].iov_base = (char *) buf;
	521	io[1].iov_len = len;
	522	os_memset(&msg, 0, sizeof(msg));
	523	msg.msg_iov = io;
	524	msg.msg_iovlen = 2;
	525
	526	idx = 0;
09e47a07 JM	527	dl_list_for_each_safe(dst, next, &priv->ctrl_dst, struct wpa_ctrl_dst,
09e47a07 JM	528	list) {
6fc6879b JM	529	if (level >= dst->debug_level) {
	530	wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
	531	(u8 *) dst->addr.sun_path, dst->addrlen -
19b9436c	532	offsetof(struct sockaddr_un, sun_path));
6fc6879b JM	533	msg.msg_name = (void *) &dst->addr;
	534	msg.msg_namelen = dst->addrlen;
	535	if (sendmsg(priv->sock, &msg, 0) < 0) {
c5aaa015 JM	536	int _errno = errno;
	537	wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
	538	"%d - %s",
	539	idx, errno, strerror(errno));
6fc6879b	540	dst->errors++;
6700a277 JM	541	if (dst->errors > 1000 \|\|
	542	(_errno != ENOBUFS && dst->errors > 10) \|\|
	543	_errno == ENOENT) {
6fc6879b JM	544	wpa_supplicant_ctrl_iface_detach(
	545	priv, &dst->addr,
	546	dst->addrlen);
	547	}
	548	} else
	549	dst->errors = 0;
	550	}
	551	idx++;
6fc6879b JM	552	}
	553	}
	554
	555
	556	void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
	557	{
	558	char buf[256];
	559	int res;
	560	struct sockaddr_un from;
	561	socklen_t fromlen = sizeof(from);
	562
	563	for (;;) {
	564	wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
	565	"attach", priv->wpa_s->ifname);
	566	eloop_wait_for_read_sock(priv->sock);
	567
	568	res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
	569	(struct sockaddr *) &from, &fromlen);
	570	if (res < 0) {
	571	perror("recvfrom(ctrl_iface)");
	572	continue;
	573	}
	574	buf[res] = '\0';
	575
	576	if (os_strcmp(buf, "ATTACH") == 0) {
	577	/* handle ATTACH signal of first monitor interface */
	578	if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
	579	fromlen)) {
	580	sendto(priv->sock, "OK\n", 3, 0,
	581	(struct sockaddr *) &from, fromlen);
	582	/* OK to continue */
	583	return;
	584	} else {
	585	sendto(priv->sock, "FAIL\n", 5, 0,
	586	(struct sockaddr *) &from, fromlen);
	587	}
	588	} else {
	589	/* return FAIL for all other signals */
	590	sendto(priv->sock, "FAIL\n", 5, 0,
	591	(struct sockaddr *) &from, fromlen);
	592	}
	593	}
	594	}
	595
	596
	597	/* Global ctrl_iface */
	598
	599	struct ctrl_iface_global_priv {
	600	struct wpa_global *global;
	601	int sock;
	602	};
	603
	604
	605	static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
	606	void *sock_ctx)
	607	{
	608	struct wpa_global *global = eloop_ctx;
	609	char buf[256];
	610	int res;
	611	struct sockaddr_un from;
	612	socklen_t fromlen = sizeof(from);
	613	char *reply;
	614	size_t reply_len;
	615
616	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
617	(struct sockaddr *) &from, &fromlen);
618	if (res < 0) {
619	perror("recvfrom(ctrl_iface)");
620	return;
621	}
622	buf[res] = '\0';
623
624	reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
625	&reply_len);
626
627	if (reply) {
628	sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
629	fromlen);
630	os_free(reply);
631	} else if (reply_len) {
632	sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
633	fromlen);
634	}
635	}
636
637
638	struct ctrl_iface_global_priv *
639	wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
640	{
641	struct ctrl_iface_global_priv *priv;
642	struct sockaddr_un addr;
643
644	priv = os_zalloc(sizeof(*priv));
645	if (priv == NULL)
646	return NULL;
647	priv->global = global;
648	priv->sock = -1;
649
650	if (global->params.ctrl_interface == NULL)
651	return priv;
652
b3f3865e DS	653	#ifdef ANDROID
	654	priv->sock = android_get_control_socket(global->params.ctrl_interface);
	655	if (priv->sock >= 0)
	656	goto havesock;
	657	#endif /* ANDROID */
	658
6fc6879b JM	659	wpa_printf(MSG_DEBUG, "Global control interface '%s'",
	660	global->params.ctrl_interface);
	661
	662	priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
	663	if (priv->sock < 0) {
	664	perror("socket(PF_UNIX)");
	665	goto fail;
	666	}
	667
	668	os_memset(&addr, 0, sizeof(addr));
09bd6e8c	669	#if defined(__FreeBSD__) \|\| defined(__FreeBSD_kernel__)
19b9436c SL	670	addr.sun_len = sizeof(addr);
19b9436c SL	671	#endif /* __FreeBSD__ */
6fc6879b JM	672	addr.sun_family = AF_UNIX;
	673	os_strlcpy(addr.sun_path, global->params.ctrl_interface,
	674	sizeof(addr.sun_path));
	675	if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
	676	perror("bind(PF_UNIX)");
	677	if (connect(priv->sock, (struct sockaddr *) &addr,
	678	sizeof(addr)) < 0) {
	679	wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
	680	" allow connections - assuming it was left"
	681	"over from forced program termination");
	682	if (unlink(global->params.ctrl_interface) < 0) {
	683	perror("unlink[ctrl_iface]");
	684	wpa_printf(MSG_ERROR, "Could not unlink "
	685	"existing ctrl_iface socket '%s'",
	686	global->params.ctrl_interface);
	687	goto fail;
	688	}
	689	if (bind(priv->sock, (struct sockaddr *) &addr,
	690	sizeof(addr)) < 0) {
	691	perror("bind(PF_UNIX)");
	692	goto fail;
	693	}
	694	wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
	695	"ctrl_iface socket '%s'",
	696	global->params.ctrl_interface);
	697	} else {
	698	wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
	699	"be in use - cannot override it");
	700	wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
	701	"not used anymore",
	702	global->params.ctrl_interface);
	703	goto fail;
	704	}
	705	}
	706
b3f3865e DS	707	#ifdef ANDROID
	708	havesock:
	709	#endif /* ANDROID */
6fc6879b JM	710	eloop_register_read_sock(priv->sock,
	711	wpa_supplicant_global_ctrl_iface_receive,
	712	global, NULL);
	713
	714	return priv;
	715
	716	fail:
	717	if (priv->sock >= 0)
	718	close(priv->sock);
	719	os_free(priv);
	720	return NULL;
	721	}
	722
	723
	724	void
	725	wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
	726	{
	727	if (priv->sock >= 0) {
	728	eloop_unregister_read_sock(priv->sock);
	729	close(priv->sock);
	730	}
	731	if (priv->global->params.ctrl_interface)
	732	unlink(priv->global->params.ctrl_interface);
	733	os_free(priv);
	734	}