2 * WPA Supplicant / UNIX domain socket -based control interface
3 * Copyright (c) 2004-2014, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
17 #include <sys/ioctl.h>
18 #include <linux/sockios.h>
19 #endif /* __linux__ */
21 #include <cutils/sockets.h>
24 #include "utils/common.h"
25 #include "utils/eloop.h"
26 #include "utils/list.h"
27 #include "common/ctrl_iface_common.h"
28 #include "eapol_supp/eapol_supp_sm.h"
30 #include "wpa_supplicant_i.h"
31 #include "ctrl_iface.h"
33 /* Per-interface ctrl_iface */
35 struct ctrl_iface_priv {
36 struct wpa_supplicant *wpa_s;
38 struct dl_list ctrl_dst;
39 int android_control_socket;
40 struct dl_list msg_queue;
41 unsigned int throttle_count;
45 struct ctrl_iface_global_priv {
46 struct wpa_global *global;
48 struct dl_list ctrl_dst;
49 int android_control_socket;
50 struct dl_list msg_queue;
51 unsigned int throttle_count;
54 struct ctrl_iface_msg {
56 struct wpa_supplicant *wpa_s;
58 enum wpa_msg_type type;
64 static void wpa_supplicant_ctrl_iface_send(struct wpa_supplicant *wpa_s,
65 const char *ifname, int sock,
66 struct dl_list *ctrl_dst,
67 int level, const char *buf,
69 struct ctrl_iface_priv *priv,
70 struct ctrl_iface_global_priv *gp);
71 static int wpas_ctrl_iface_reinit(struct wpa_supplicant *wpa_s,
72 struct ctrl_iface_priv *priv);
73 static int wpas_ctrl_iface_global_reinit(struct wpa_global *global,
74 struct ctrl_iface_global_priv *priv);
77 static void wpas_ctrl_sock_debug(const char *title, int sock, const char *buf,
83 int level = MSG_MSGDUMP;
85 if (len >= 5 && os_strncmp(buf, "PONG\n", 5) == 0)
86 level = MSG_EXCESSIVE;
88 optlen = sizeof(sndbuf);
90 if (getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &sndbuf, &optlen) < 0)
93 if (ioctl(sock, SIOCOUTQ, &outq) < 0)
97 "CTRL-DEBUG: %s: sock=%d sndbuf=%d outq=%d send_len=%d",
98 title, sock, sndbuf, outq, (int) len);
99 #endif /* __linux__ */
103 static int wpa_supplicant_ctrl_iface_attach(struct dl_list *ctrl_dst,
104 struct sockaddr_un *from,
105 socklen_t fromlen, int global)
107 return ctrl_iface_attach(ctrl_dst, from, fromlen);
111 static int wpa_supplicant_ctrl_iface_detach(struct dl_list *ctrl_dst,
112 struct sockaddr_un *from,
115 return ctrl_iface_detach(ctrl_dst, from, fromlen);
119 static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
120 struct sockaddr_un *from,
124 wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
126 return ctrl_iface_level(&priv->ctrl_dst, from, fromlen, level);
130 static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
133 struct wpa_supplicant *wpa_s = eloop_ctx;
134 struct ctrl_iface_priv *priv = sock_ctx;
137 struct sockaddr_un from;
138 socklen_t fromlen = sizeof(from);
139 char *reply = NULL, *reply_buf = NULL;
140 size_t reply_len = 0;
141 int new_attached = 0;
143 res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
144 (struct sockaddr *) &from, &fromlen);
146 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
152 if (os_strcmp(buf, "ATTACH") == 0) {
153 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
160 } else if (os_strcmp(buf, "DETACH") == 0) {
161 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
166 } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
167 if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
173 reply_buf = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
178 * There could be some password/key material in the command, so
179 * clear the buffer explicitly now that it is not needed
182 os_memset(buf, 0, res);
185 if (!reply && reply_len == 1) {
188 } else if (!reply && reply_len == 2) {
194 wpas_ctrl_sock_debug("ctrl_sock-sendto", sock, reply,
196 if (sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
199 wpa_dbg(wpa_s, MSG_DEBUG,
200 "ctrl_iface sendto failed: %d - %s",
201 _errno, strerror(_errno));
202 if (_errno == ENOBUFS || _errno == EAGAIN) {
204 * The socket send buffer could be full. This
205 * may happen if client programs are not
206 * receiving their pending messages. Close and
207 * reopen the socket as a workaround to avoid
208 * getting stuck being unable to send any new
211 sock = wpas_ctrl_iface_reinit(wpa_s, priv);
213 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to reinitialize ctrl_iface socket");
217 wpa_dbg(wpa_s, MSG_DEBUG, "Failed to send response to ATTACH - detaching");
219 wpa_supplicant_ctrl_iface_detach(
220 &priv->ctrl_dst, &from, fromlen);
227 eapol_sm_notify_ctrl_attached(wpa_s->eapol);
231 static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
235 char *pbuf, *dir = NULL;
238 if (wpa_s->conf->ctrl_interface == NULL)
241 pbuf = os_strdup(wpa_s->conf->ctrl_interface);
244 if (os_strncmp(pbuf, "DIR=", 4) == 0) {
247 gid_str = os_strstr(dir, " GROUP=");
253 len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
254 buf = os_malloc(len);
260 res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
261 if (os_snprintf_error(len, res)) {
268 /* Windows/WinPcap uses interface names that are not suitable
269 * as a file name - convert invalid chars to underscores */
277 #endif /* __CYGWIN__ */
283 static int wpas_ctrl_iface_throttle(int sock)
289 optlen = sizeof(sndbuf);
291 if (getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &sndbuf, &optlen) < 0 ||
292 ioctl(sock, SIOCOUTQ, &outq) < 0 ||
293 sndbuf <= 0 || outq < 0)
295 return outq > sndbuf / 2;
296 #else /* __linux__ */
298 #endif /* __linux__ */
302 static void wpas_ctrl_msg_send_pending_global(struct wpa_global *global)
304 struct ctrl_iface_global_priv *gpriv;
305 struct ctrl_iface_msg *msg;
307 gpriv = global->ctrl_iface;
308 while (gpriv && !dl_list_empty(&gpriv->msg_queue) &&
309 !wpas_ctrl_iface_throttle(gpriv->sock)) {
310 msg = dl_list_first(&gpriv->msg_queue, struct ctrl_iface_msg,
314 dl_list_del(&msg->list);
315 wpa_supplicant_ctrl_iface_send(
317 msg->type != WPA_MSG_PER_INTERFACE ?
318 NULL : msg->wpa_s->ifname,
319 gpriv->sock, &gpriv->ctrl_dst, msg->level,
320 msg->txt, msg->len, NULL, gpriv);
326 static void wpas_ctrl_msg_send_pending_iface(struct wpa_supplicant *wpa_s)
328 struct ctrl_iface_priv *priv;
329 struct ctrl_iface_msg *msg;
331 priv = wpa_s->ctrl_iface;
332 while (priv && !dl_list_empty(&priv->msg_queue) &&
333 !wpas_ctrl_iface_throttle(priv->sock)) {
334 msg = dl_list_first(&priv->msg_queue, struct ctrl_iface_msg,
338 dl_list_del(&msg->list);
339 wpa_supplicant_ctrl_iface_send(wpa_s, NULL, priv->sock,
340 &priv->ctrl_dst, msg->level,
341 msg->txt, msg->len, priv, NULL);
347 static void wpas_ctrl_msg_queue_timeout(void *eloop_ctx, void *timeout_ctx)
349 struct wpa_supplicant *wpa_s = eloop_ctx;
350 struct ctrl_iface_priv *priv;
351 struct ctrl_iface_global_priv *gpriv;
352 int sock = -1, gsock = -1;
354 wpas_ctrl_msg_send_pending_global(wpa_s->global);
355 wpas_ctrl_msg_send_pending_iface(wpa_s);
357 priv = wpa_s->ctrl_iface;
358 if (priv && !dl_list_empty(&priv->msg_queue))
361 gpriv = wpa_s->global->ctrl_iface;
362 if (gpriv && !dl_list_empty(&gpriv->msg_queue))
365 if (sock > -1 || gsock > -1) {
366 /* Continue pending message transmission from a timeout */
367 wpa_printf(MSG_MSGDUMP,
368 "CTRL: Had to throttle pending event message transmission for (sock %d gsock %d)",
370 eloop_register_timeout(0, 20000, wpas_ctrl_msg_queue_timeout,
376 static void wpas_ctrl_msg_queue(struct dl_list *queue,
377 struct wpa_supplicant *wpa_s, int level,
378 enum wpa_msg_type type,
379 const char *txt, size_t len)
381 struct ctrl_iface_msg *msg;
383 msg = os_zalloc(sizeof(*msg) + len);
390 os_memcpy(msg + 1, txt, len);
391 msg->txt = (const char *) (msg + 1);
393 dl_list_add_tail(queue, &msg->list);
394 eloop_cancel_timeout(wpas_ctrl_msg_queue_timeout, wpa_s, NULL);
395 eloop_register_timeout(0, 0, wpas_ctrl_msg_queue_timeout, wpa_s, NULL);
399 static void wpas_ctrl_msg_queue_limit(unsigned int throttle_count,
400 struct dl_list *queue)
402 struct ctrl_iface_msg *msg;
404 if (throttle_count < 2000)
407 msg = dl_list_first(queue, struct ctrl_iface_msg, list);
409 wpa_printf(MSG_DEBUG, "CTRL: Dropped oldest pending message");
410 dl_list_del(&msg->list);
416 static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
417 enum wpa_msg_type type,
418 const char *txt, size_t len)
420 struct wpa_supplicant *wpa_s = ctx;
421 struct ctrl_iface_priv *priv;
422 struct ctrl_iface_global_priv *gpriv;
427 gpriv = wpa_s->global->ctrl_iface;
429 if (type != WPA_MSG_NO_GLOBAL && gpriv &&
430 !dl_list_empty(&gpriv->ctrl_dst)) {
431 if (!dl_list_empty(&gpriv->msg_queue) ||
432 wpas_ctrl_iface_throttle(gpriv->sock)) {
433 if (gpriv->throttle_count == 0) {
434 wpa_printf(MSG_MSGDUMP,
435 "CTRL: Had to throttle global event message for sock %d",
438 gpriv->throttle_count++;
439 wpas_ctrl_msg_queue_limit(gpriv->throttle_count,
441 wpas_ctrl_msg_queue(&gpriv->msg_queue, wpa_s, level,
444 if (gpriv->throttle_count) {
445 wpa_printf(MSG_MSGDUMP,
446 "CTRL: Had to throttle %u global event message(s) for sock %d",
447 gpriv->throttle_count, gpriv->sock);
449 gpriv->throttle_count = 0;
450 wpa_supplicant_ctrl_iface_send(
452 type != WPA_MSG_PER_INTERFACE ?
453 NULL : wpa_s->ifname,
454 gpriv->sock, &gpriv->ctrl_dst, level,
455 txt, len, NULL, gpriv);
459 priv = wpa_s->ctrl_iface;
461 if (type != WPA_MSG_ONLY_GLOBAL && priv) {
462 if (!dl_list_empty(&priv->msg_queue) ||
463 wpas_ctrl_iface_throttle(priv->sock)) {
464 if (priv->throttle_count == 0) {
465 wpa_printf(MSG_MSGDUMP,
466 "CTRL: Had to throttle event message for sock %d",
469 priv->throttle_count++;
470 wpas_ctrl_msg_queue_limit(priv->throttle_count,
472 wpas_ctrl_msg_queue(&priv->msg_queue, wpa_s, level,
475 if (priv->throttle_count) {
476 wpa_printf(MSG_MSGDUMP,
477 "CTRL: Had to throttle %u event message(s) for sock %d",
478 priv->throttle_count, priv->sock);
480 priv->throttle_count = 0;
481 wpa_supplicant_ctrl_iface_send(wpa_s, NULL, priv->sock,
482 &priv->ctrl_dst, level,
483 txt, len, priv, NULL);
489 static int wpas_ctrl_iface_open_sock(struct wpa_supplicant *wpa_s,
490 struct ctrl_iface_priv *priv)
492 struct sockaddr_un addr;
496 char *buf, *dir = NULL, *gid_str = NULL;
501 buf = os_strdup(wpa_s->conf->ctrl_interface);
505 os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
506 wpa_s->conf->ctrl_interface);
507 priv->sock = android_get_control_socket(addr.sun_path);
508 if (priv->sock >= 0) {
509 priv->android_control_socket = 1;
513 if (os_strncmp(buf, "DIR=", 4) == 0) {
515 gid_str = os_strstr(dir, " GROUP=");
522 gid_str = wpa_s->conf->ctrl_interface_group;
525 if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
526 if (errno == EEXIST) {
527 wpa_printf(MSG_DEBUG, "Using existing control "
528 "interface directory.");
530 wpa_printf(MSG_ERROR, "mkdir[ctrl_interface=%s]: %s",
531 dir, strerror(errno));
538 * wpa_supplicant is started from /init.*.rc on Android and that seems
539 * to be using umask 0077 which would leave the control interface
540 * directory without group access. This breaks things since Wi-Fi
541 * framework assumes that this directory can be accessed by other
542 * applications in the wifi group. Fix this by adding group access even
543 * if umask value would prevent this.
545 if (chmod(dir, S_IRWXU | S_IRWXG) < 0) {
546 wpa_printf(MSG_ERROR, "CTRL: Could not chmod directory: %s",
548 /* Try to continue anyway */
553 grp = getgrnam(gid_str);
557 wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
558 " (from group name '%s')",
561 /* Group name not found - try to parse this as gid */
562 gid = strtol(gid_str, &endp, 10);
563 if (*gid_str == '\0' || *endp != '\0') {
564 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
569 wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
574 if (gid_set && chown(dir, -1, gid) < 0) {
575 wpa_printf(MSG_ERROR, "chown[ctrl_interface=%s,gid=%d]: %s",
576 dir, (int) gid, strerror(errno));
580 /* Make sure the group can enter and read the directory */
582 chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
583 wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
588 if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
589 sizeof(addr.sun_path)) {
590 wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
594 priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
595 if (priv->sock < 0) {
596 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
600 os_memset(&addr, 0, sizeof(addr));
601 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
602 addr.sun_len = sizeof(addr);
603 #endif /* __FreeBSD__ */
604 addr.sun_family = AF_UNIX;
605 fname = wpa_supplicant_ctrl_iface_path(wpa_s);
608 os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
609 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
610 wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
612 if (connect(priv->sock, (struct sockaddr *) &addr,
614 wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
615 " allow connections - assuming it was left"
616 "over from forced program termination");
617 if (unlink(fname) < 0) {
618 wpa_printf(MSG_ERROR,
619 "Could not unlink existing ctrl_iface socket '%s': %s",
620 fname, strerror(errno));
623 if (bind(priv->sock, (struct sockaddr *) &addr,
625 wpa_printf(MSG_ERROR, "supp-ctrl-iface-init: bind(PF_UNIX): %s",
629 wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
630 "ctrl_iface socket '%s'", fname);
632 wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
633 "be in use - cannot override it");
634 wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
635 "not used anymore", fname);
642 if (gid_set && chown(fname, -1, gid) < 0) {
643 wpa_printf(MSG_ERROR, "chown[ctrl_interface=%s,gid=%d]: %s",
644 fname, (int) gid, strerror(errno));
648 if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
649 wpa_printf(MSG_ERROR, "chmod[ctrl_interface=%s]: %s",
650 fname, strerror(errno));
660 * Make socket non-blocking so that we don't hang forever if
661 * target dies unexpectedly.
663 flags = fcntl(priv->sock, F_GETFL);
666 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
667 wpa_printf(MSG_INFO, "fcntl(ctrl, O_NONBLOCK): %s",
669 /* Not fatal, continue on.*/
673 eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
675 wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
681 if (priv->sock >= 0) {
694 struct ctrl_iface_priv *
695 wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
697 struct ctrl_iface_priv *priv;
699 priv = os_zalloc(sizeof(*priv));
702 dl_list_init(&priv->ctrl_dst);
703 dl_list_init(&priv->msg_queue);
707 if (wpa_s->conf->ctrl_interface == NULL)
711 if (wpa_s->global->params.ctrl_interface) {
714 if (wpa_s->global->params.ctrl_interface[0] == '/') {
715 if (os_strcmp(wpa_s->global->params.ctrl_interface,
716 wpa_s->conf->ctrl_interface) == 0)
718 } else if (os_strncmp(wpa_s->global->params.ctrl_interface,
719 "@android:", 9) == 0 ||
720 os_strncmp(wpa_s->global->params.ctrl_interface,
721 "@abstract:", 10) == 0) {
725 * Currently, Android uses @android:wpa_* as the naming
726 * convention for the global ctrl interface. This logic
727 * needs to be revisited if the above naming convention
730 pos = os_strchr(wpa_s->global->params.ctrl_interface,
734 wpa_s->conf->ctrl_interface) == 0)
740 * The invalid configuration combination might be
741 * possible to hit in an Android OTA upgrade case, so
742 * instead of refusing to start the wpa_supplicant
743 * process, do not open the per-interface ctrl_iface
744 * and continue with the global control interface that
745 * was set from the command line since the Wi-Fi
746 * framework will use it for operations.
748 wpa_printf(MSG_ERROR,
749 "global ctrl interface %s matches ctrl interface %s - do not open per-interface ctrl interface",
750 wpa_s->global->params.ctrl_interface,
751 wpa_s->conf->ctrl_interface);
757 if (wpas_ctrl_iface_open_sock(wpa_s, priv) < 0) {
766 static int wpas_ctrl_iface_reinit(struct wpa_supplicant *wpa_s,
767 struct ctrl_iface_priv *priv)
775 * On Android, the control socket being used may be the socket
776 * that is created when wpa_supplicant is started as a /init.*.rc
777 * service. Such a socket is maintained as a key-value pair in
778 * Android's environment. Closing this control socket would leave us
779 * in a bad state with an invalid socket descriptor.
781 if (priv->android_control_socket)
784 eloop_unregister_read_sock(priv->sock);
787 res = wpas_ctrl_iface_open_sock(wpa_s, priv);
794 void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
796 struct wpa_ctrl_dst *dst, *prev;
797 struct ctrl_iface_msg *msg, *prev_msg;
798 struct ctrl_iface_global_priv *gpriv;
800 if (priv->sock > -1) {
802 char *buf, *dir = NULL;
803 eloop_unregister_read_sock(priv->sock);
804 if (!dl_list_empty(&priv->ctrl_dst)) {
806 * Wait before closing the control socket if
807 * there are any attached monitors in order to allow
808 * them to receive any pending messages.
810 wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
811 "monitors to receive messages");
816 fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
822 if (priv->wpa_s->conf->ctrl_interface == NULL)
824 buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
827 if (os_strncmp(buf, "DIR=", 4) == 0) {
830 gid_str = os_strstr(dir, " GROUP=");
836 if (rmdir(dir) < 0) {
837 if (errno == ENOTEMPTY) {
838 wpa_printf(MSG_DEBUG, "Control interface "
839 "directory not empty - leaving it "
842 wpa_printf(MSG_ERROR,
843 "rmdir[ctrl_interface=%s]: %s",
844 dir, strerror(errno));
851 dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
853 dl_list_del(&dst->list);
856 dl_list_for_each_safe(msg, prev_msg, &priv->msg_queue,
857 struct ctrl_iface_msg, list) {
858 dl_list_del(&msg->list);
861 gpriv = priv->wpa_s->global->ctrl_iface;
863 dl_list_for_each_safe(msg, prev_msg, &gpriv->msg_queue,
864 struct ctrl_iface_msg, list) {
865 if (msg->wpa_s == priv->wpa_s) {
866 dl_list_del(&msg->list);
871 eloop_cancel_timeout(wpas_ctrl_msg_queue_timeout, priv->wpa_s, NULL);
877 * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
878 * @ifname: Interface name for global control socket or %NULL
879 * @sock: Local socket fd
880 * @ctrl_dst: List of attached listeners
881 * @level: Priority level of the message
883 * @len: Message length
885 * Send a packet to all monitor programs attached to the control interface.
887 static void wpa_supplicant_ctrl_iface_send(struct wpa_supplicant *wpa_s,
888 const char *ifname, int sock,
889 struct dl_list *ctrl_dst,
890 int level, const char *buf,
892 struct ctrl_iface_priv *priv,
893 struct ctrl_iface_global_priv *gp)
895 struct wpa_ctrl_dst *dst, *next;
901 if (sock < 0 || dl_list_empty(ctrl_dst))
904 res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
905 if (os_snprintf_error(sizeof(levelstr), res))
909 io[idx].iov_base = "IFNAME=";
912 io[idx].iov_base = (char *) ifname;
913 io[idx].iov_len = os_strlen(ifname);
915 io[idx].iov_base = " ";
919 io[idx].iov_base = levelstr;
920 io[idx].iov_len = os_strlen(levelstr);
922 io[idx].iov_base = (char *) buf;
923 io[idx].iov_len = len;
925 os_memset(&msg, 0, sizeof(msg));
927 msg.msg_iovlen = idx;
929 dl_list_for_each_safe(dst, next, ctrl_dst, struct wpa_ctrl_dst, list) {
933 if (level < dst->debug_level)
936 printf_encode(addr_txt, sizeof(addr_txt),
937 (u8 *) dst->addr.sun_path, dst->addrlen -
938 offsetof(struct sockaddr_un, sun_path));
939 msg.msg_name = (void *) &dst->addr;
940 msg.msg_namelen = dst->addrlen;
941 wpas_ctrl_sock_debug("ctrl_sock-sendmsg", sock, buf, len);
942 if (sendmsg(sock, &msg, MSG_DONTWAIT) >= 0) {
943 wpa_printf(MSG_MSGDUMP,
944 "CTRL_IFACE monitor sent successfully to %s",
951 wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor[%s]: %d - %s",
952 addr_txt, errno, strerror(errno));
955 if (dst->errors > 10 || _errno == ENOENT || _errno == EPERM) {
956 wpa_printf(MSG_INFO, "CTRL_IFACE: Detach monitor %s that cannot receive messages",
958 wpa_supplicant_ctrl_iface_detach(ctrl_dst, &dst->addr,
962 if (_errno == ENOBUFS || _errno == EAGAIN) {
964 * The socket send buffer could be full. This may happen
965 * if client programs are not receiving their pending
966 * messages. Close and reopen the socket as a workaround
967 * to avoid getting stuck being unable to send any new
971 sock = wpas_ctrl_iface_reinit(wpa_s, priv);
973 sock = wpas_ctrl_iface_global_reinit(
978 wpa_dbg(wpa_s, MSG_DEBUG,
979 "Failed to reinitialize ctrl_iface socket");
987 void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
991 struct sockaddr_un from;
992 socklen_t fromlen = sizeof(from);
994 if (priv->sock == -1)
998 wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
999 "attach", priv->wpa_s->ifname);
1000 eloop_wait_for_read_sock(priv->sock);
1002 res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
1003 (struct sockaddr *) &from, &fromlen);
1005 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
1011 if (os_strcmp(buf, "ATTACH") == 0) {
1012 /* handle ATTACH signal of first monitor interface */
1013 if (!wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst,
1016 if (sendto(priv->sock, "OK\n", 3, 0,
1017 (struct sockaddr *) &from, fromlen) <
1019 wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
1022 /* OK to continue */
1025 if (sendto(priv->sock, "FAIL\n", 5, 0,
1026 (struct sockaddr *) &from, fromlen) <
1028 wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
1033 /* return FAIL for all other signals */
1034 if (sendto(priv->sock, "FAIL\n", 5, 0,
1035 (struct sockaddr *) &from, fromlen) < 0) {
1036 wpa_printf(MSG_DEBUG,
1037 "ctrl_iface sendto failed: %s",
1045 /* Global ctrl_iface */
1047 static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
1050 struct wpa_global *global = eloop_ctx;
1051 struct ctrl_iface_global_priv *priv = sock_ctx;
1054 struct sockaddr_un from;
1055 socklen_t fromlen = sizeof(from);
1056 char *reply = NULL, *reply_buf = NULL;
1059 res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
1060 (struct sockaddr *) &from, &fromlen);
1062 wpa_printf(MSG_ERROR, "recvfrom(ctrl_iface): %s",
1068 if (os_strcmp(buf, "ATTACH") == 0) {
1069 if (wpa_supplicant_ctrl_iface_attach(&priv->ctrl_dst, &from,
1074 } else if (os_strcmp(buf, "DETACH") == 0) {
1075 if (wpa_supplicant_ctrl_iface_detach(&priv->ctrl_dst, &from,
1081 reply_buf = wpa_supplicant_global_ctrl_iface_process(
1082 global, buf, &reply_len);
1086 * There could be some password/key material in the command, so
1087 * clear the buffer explicitly now that it is not needed
1090 os_memset(buf, 0, res);
1093 if (!reply && reply_len == 1) {
1096 } else if (!reply && reply_len == 2) {
1102 wpas_ctrl_sock_debug("global_ctrl_sock-sendto",
1103 sock, reply, reply_len);
1104 if (sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
1106 wpa_printf(MSG_DEBUG, "ctrl_iface sendto failed: %s",
1114 static int wpas_global_ctrl_iface_open_sock(struct wpa_global *global,
1115 struct ctrl_iface_global_priv *priv)
1117 struct sockaddr_un addr;
1118 const char *ctrl = global->params.ctrl_interface;
1121 wpa_printf(MSG_DEBUG, "Global control interface '%s'", ctrl);
1124 if (os_strncmp(ctrl, "@android:", 9) == 0) {
1125 priv->sock = android_get_control_socket(ctrl + 9);
1126 if (priv->sock < 0) {
1127 wpa_printf(MSG_ERROR, "Failed to open Android control "
1128 "socket '%s'", ctrl + 9);
1131 wpa_printf(MSG_DEBUG, "Using Android control socket '%s'",
1133 priv->android_control_socket = 1;
1137 if (os_strncmp(ctrl, "@abstract:", 10) != 0) {
1139 * Backwards compatibility - try to open an Android control
1140 * socket and if that fails, assume this was a UNIX domain
1143 priv->sock = android_get_control_socket(ctrl);
1144 if (priv->sock >= 0) {
1145 wpa_printf(MSG_DEBUG,
1146 "Using Android control socket '%s'",
1148 priv->android_control_socket = 1;
1152 #endif /* ANDROID */
1154 priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
1155 if (priv->sock < 0) {
1156 wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
1160 os_memset(&addr, 0, sizeof(addr));
1161 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1162 addr.sun_len = sizeof(addr);
1163 #endif /* __FreeBSD__ */
1164 addr.sun_family = AF_UNIX;
1166 if (os_strncmp(ctrl, "@abstract:", 10) == 0) {
1167 addr.sun_path[0] = '\0';
1168 os_strlcpy(addr.sun_path + 1, ctrl + 10,
1169 sizeof(addr.sun_path) - 1);
1170 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) <
1172 wpa_printf(MSG_ERROR, "supp-global-ctrl-iface-init: "
1173 "bind(PF_UNIX;%s) failed: %s",
1174 ctrl, strerror(errno));
1177 wpa_printf(MSG_DEBUG, "Using Abstract control socket '%s'",
1182 os_strlcpy(addr.sun_path, ctrl, sizeof(addr.sun_path));
1183 if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
1184 wpa_printf(MSG_INFO, "supp-global-ctrl-iface-init(%s) (will try fixup): bind(PF_UNIX): %s",
1185 ctrl, strerror(errno));
1186 if (connect(priv->sock, (struct sockaddr *) &addr,
1187 sizeof(addr)) < 0) {
1188 wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
1189 " allow connections - assuming it was left"
1190 "over from forced program termination");
1191 if (unlink(ctrl) < 0) {
1192 wpa_printf(MSG_ERROR,
1193 "Could not unlink existing ctrl_iface socket '%s': %s",
1194 ctrl, strerror(errno));
1197 if (bind(priv->sock, (struct sockaddr *) &addr,
1198 sizeof(addr)) < 0) {
1199 wpa_printf(MSG_ERROR, "supp-glb-iface-init: bind(PF_UNIX;%s): %s",
1200 ctrl, strerror(errno));
1203 wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
1204 "ctrl_iface socket '%s'",
1207 wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
1208 "be in use - cannot override it");
1209 wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
1216 wpa_printf(MSG_DEBUG, "Using UNIX control socket '%s'", ctrl);
1218 if (global->params.ctrl_interface_group) {
1219 char *gid_str = global->params.ctrl_interface_group;
1224 grp = getgrnam(gid_str);
1227 wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
1228 " (from group name '%s')",
1229 (int) gid, gid_str);
1231 /* Group name not found - try to parse this as gid */
1232 gid = strtol(gid_str, &endp, 10);
1233 if (*gid_str == '\0' || *endp != '\0') {
1234 wpa_printf(MSG_ERROR, "CTRL: Invalid group "
1238 wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
1241 if (chown(ctrl, -1, gid) < 0) {
1242 wpa_printf(MSG_ERROR,
1243 "chown[global_ctrl_interface=%s,gid=%d]: %s",
1244 ctrl, (int) gid, strerror(errno));
1248 if (chmod(ctrl, S_IRWXU | S_IRWXG) < 0) {
1249 wpa_printf(MSG_ERROR,
1250 "chmod[global_ctrl_interface=%s]: %s",
1251 ctrl, strerror(errno));
1255 if (chmod(ctrl, S_IRWXU) < 0) {
1256 wpa_printf(MSG_DEBUG,
1257 "chmod[global_ctrl_interface=%s](S_IRWXU): %s",
1258 ctrl, strerror(errno));
1259 /* continue anyway since group change was not required
1267 * Make socket non-blocking so that we don't hang forever if
1268 * target dies unexpectedly.
1270 flags = fcntl(priv->sock, F_GETFL);
1272 flags |= O_NONBLOCK;
1273 if (fcntl(priv->sock, F_SETFL, flags) < 0) {
1274 wpa_printf(MSG_INFO, "fcntl(ctrl, O_NONBLOCK): %s",
1276 /* Not fatal, continue on.*/
1280 eloop_register_read_sock(priv->sock,
1281 wpa_supplicant_global_ctrl_iface_receive,
1287 if (priv->sock >= 0) {
1295 struct ctrl_iface_global_priv *
1296 wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
1298 struct ctrl_iface_global_priv *priv;
1300 priv = os_zalloc(sizeof(*priv));
1303 dl_list_init(&priv->ctrl_dst);
1304 dl_list_init(&priv->msg_queue);
1305 priv->global = global;
1308 if (global->params.ctrl_interface == NULL)
1311 if (wpas_global_ctrl_iface_open_sock(global, priv) < 0) {
1316 wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
1322 static int wpas_ctrl_iface_global_reinit(struct wpa_global *global,
1323 struct ctrl_iface_global_priv *priv)
1327 if (priv->sock <= 0)
1331 * On Android, the control socket being used may be the socket
1332 * that is created when wpa_supplicant is started as a /init.*.rc
1333 * service. Such a socket is maintained as a key-value pair in
1334 * Android's environment. Closing this control socket would leave us
1335 * in a bad state with an invalid socket descriptor.
1337 if (priv->android_control_socket)
1340 eloop_unregister_read_sock(priv->sock);
1343 res = wpas_global_ctrl_iface_open_sock(global, priv);
1351 wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
1353 struct wpa_ctrl_dst *dst, *prev;
1354 struct ctrl_iface_msg *msg, *prev_msg;
1356 if (priv->sock >= 0) {
1357 eloop_unregister_read_sock(priv->sock);
1360 if (priv->global->params.ctrl_interface)
1361 unlink(priv->global->params.ctrl_interface);
1362 dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
1364 dl_list_del(&dst->list);
1367 dl_list_for_each_safe(msg, prev_msg, &priv->msg_queue,
1368 struct ctrl_iface_msg, list) {
1369 dl_list_del(&msg->list);