/*
* WPA Supplicant / UNIX domain socket -based control interface
* 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.
*/
#include "includes.h"
#include <sys/un.h>
#include <sys/stat.h>
#include <grp.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef __linux__
#include <sys/ioctl.h>
#include <linux/sockios.h>
#endif /* __linux__ */
#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;
int android_control_socket;
struct dl_list msg_queue;
unsigned int throttle_count;
};
struct ctrl_iface_global_priv {
struct wpa_global *global;
int sock;
struct dl_list ctrl_dst;
int android_control_socket;
struct dl_list msg_queue;
unsigned int throttle_count;
};
struct ctrl_iface_msg {
struct dl_list list;
struct wpa_supplicant *wpa_s;
int level;
enum wpa_msg_type type;
const char *txt;
size_t len;
};
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,
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 void wpas_ctrl_sock_debug(const char *title, int sock, const char *buf,
size_t len)
{
#ifdef __linux__
socklen_t optlen;
int sndbuf, outq;
int level = MSG_DEBUG;
if (len >= 5 && os_strncmp(buf, "PONG\n", 5) == 0)
level = MSG_EXCESSIVE;
optlen = sizeof(sndbuf);
sndbuf = 0;
if (getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &sndbuf, &optlen) < 0)
sndbuf = -1;
if (ioctl(sock, SIOCOUTQ, &outq) < 0)
outq = -1;
wpa_printf(level,
"CTRL-DEBUG: %s: sock=%d sndbuf=%d outq=%d send_len=%d",
title, sock, sndbuf, outq, (int) len);
#endif /* __linux__ */
}
static int wpa_supplicant_ctrl_iface_attach(struct dl_list *ctrl_dst,
struct sockaddr_un *from,
socklen_t fromlen, int global)
{
struct wpa_ctrl_dst *dst;
char addr_txt[200];
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(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 dl_list *ctrl_dst,
struct sockaddr_un *from,
socklen_t fromlen)
{
struct wpa_ctrl_dst *dst;
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);
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) {
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;
}
}
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, *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) {
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->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->ctrl_dst, &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_buf = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
&reply_len);
reply = reply_buf;
/*
* There could be some password/key material in the command, so
* clear the buffer explicitly now that it is not needed
* anymore.
*/
os_memset(buf, 0, res);
}
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) {
wpas_ctrl_sock_debug("ctrl_sock-sendto", sock, reply,
reply_len);
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);
}
static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
{
char *buf;
size_t len;
char *pbuf, *dir = 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) {
char *gid_str;
dir = pbuf + 4;
gid_str = os_strstr(dir, " GROUP=");
if (gid_str)
*gid_str = '\0';
} 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 (os_snprintf_error(len, res)) {
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 int wpas_ctrl_iface_throttle(int sock)
{
#ifdef __linux__
socklen_t optlen;
int sndbuf, outq;
optlen = sizeof(sndbuf);
sndbuf = 0;
if (getsockopt(sock, SOL_SOCKET, SO_SNDBUF, &sndbuf, &optlen) < 0 ||
ioctl(sock, SIOCOUTQ, &outq) < 0 ||
sndbuf <= 0 || outq < 0)
return 0;
return outq > sndbuf / 2;
#else /* __linux__ */
return 0;
#endif /* __linux__ */
}
static void wpas_ctrl_msg_send_pending_global(struct wpa_global *global)
{
struct ctrl_iface_global_priv *gpriv;
struct ctrl_iface_msg *msg;
gpriv = global->ctrl_iface;
while (gpriv && !dl_list_empty(&gpriv->msg_queue) &&
!wpas_ctrl_iface_throttle(gpriv->sock)) {
msg = dl_list_first(&gpriv->msg_queue, struct ctrl_iface_msg,
list);
if (!msg)
break;
dl_list_del(&msg->list);
wpa_supplicant_ctrl_iface_send(
msg->wpa_s,
msg->type != WPA_MSG_PER_INTERFACE ?
NULL : msg->wpa_s->ifname,
gpriv->sock, &gpriv->ctrl_dst, msg->level,
msg->txt, msg->len, NULL, gpriv);
os_free(msg);
}
}
static void wpas_ctrl_msg_send_pending_iface(struct wpa_supplicant *wpa_s)
{
struct ctrl_iface_priv *priv;
struct ctrl_iface_msg *msg;
priv = wpa_s->ctrl_iface;
while (priv && !dl_list_empty(&priv->msg_queue) &&
!wpas_ctrl_iface_throttle(priv->sock)) {
msg = dl_list_first(&priv->msg_queue, struct ctrl_iface_msg,
list);
if (!msg)
break;
dl_list_del(&msg->list);
wpa_supplicant_ctrl_iface_send(wpa_s, NULL, priv->sock,
&priv->ctrl_dst, msg->level,
msg->txt, msg->len, priv, NULL);
os_free(msg);
}
}
static void wpas_ctrl_msg_queue_timeout(void *eloop_ctx, void *timeout_ctx)
{
struct wpa_supplicant *wpa_s = eloop_ctx;
struct ctrl_iface_priv *priv;
struct ctrl_iface_global_priv *gpriv;
int sock = -1, gsock = -1;
wpas_ctrl_msg_send_pending_global(wpa_s->global);
wpas_ctrl_msg_send_pending_iface(wpa_s);
priv = wpa_s->ctrl_iface;
if (priv && !dl_list_empty(&priv->msg_queue))
sock = priv->sock;
gpriv = wpa_s->global->ctrl_iface;
if (gpriv && !dl_list_empty(&gpriv->msg_queue))
gsock = gpriv->sock;
if (sock > -1 || gsock > -1) {
/* Continue pending message transmission from a timeout */
wpa_printf(MSG_MSGDUMP,
"CTRL: Had to throttle pending event message transmission for (sock %d gsock %d)",
sock, gsock);
eloop_register_timeout(0, 20000, wpas_ctrl_msg_queue_timeout,
wpa_s, NULL);
}
}
static void wpas_ctrl_msg_queue(struct dl_list *queue,
struct wpa_supplicant *wpa_s, int level,
enum wpa_msg_type type,
const char *txt, size_t len)
{
struct ctrl_iface_msg *msg;
msg = os_zalloc(sizeof(*msg) + len);
if (!msg)
return;
msg->wpa_s = wpa_s;
msg->level = level;
msg->type = type;
os_memcpy(msg + 1, txt, len);
msg->txt = (const char *) (msg + 1);
msg->len = len;
dl_list_add_tail(queue, &msg->list);
eloop_cancel_timeout(wpas_ctrl_msg_queue_timeout, wpa_s, NULL);
eloop_register_timeout(0, 0, wpas_ctrl_msg_queue_timeout, wpa_s, NULL);
}
static void wpas_ctrl_msg_queue_limit(unsigned int throttle_count,
struct dl_list *queue)
{
struct ctrl_iface_msg *msg;
if (throttle_count < 2000)
return;
msg = dl_list_first(queue, struct ctrl_iface_msg, list);
if (msg) {
wpa_printf(MSG_DEBUG, "CTRL: Dropped oldest pending message");
dl_list_del(&msg->list);
os_free(msg);
}
}
static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
enum wpa_msg_type type,
const char *txt, size_t len)
{
struct wpa_supplicant *wpa_s = ctx;
struct ctrl_iface_priv *priv;
struct ctrl_iface_global_priv *gpriv;
if (wpa_s == NULL)
return;
gpriv = wpa_s->global->ctrl_iface;
if (type != WPA_MSG_NO_GLOBAL && gpriv &&
!dl_list_empty(&gpriv->ctrl_dst)) {
if (!dl_list_empty(&gpriv->msg_queue) ||
wpas_ctrl_iface_throttle(gpriv->sock)) {
if (gpriv->throttle_count == 0) {
wpa_printf(MSG_MSGDUMP,
"CTRL: Had to throttle global event message for sock %d",
gpriv->sock);
}
gpriv->throttle_count++;
wpas_ctrl_msg_queue_limit(gpriv->throttle_count,
&gpriv->msg_queue);
wpas_ctrl_msg_queue(&gpriv->msg_queue, wpa_s, level,
type, txt, len);
} else {
if (gpriv->throttle_count) {
wpa_printf(MSG_MSGDUMP,
"CTRL: Had to throttle %u global event message(s) for sock %d",
gpriv->throttle_count, gpriv->sock);
}
gpriv->throttle_count = 0;
wpa_supplicant_ctrl_iface_send(
wpa_s,
type != WPA_MSG_PER_INTERFACE ?
NULL : wpa_s->ifname,
gpriv->sock, &gpriv->ctrl_dst, level,
txt, len, NULL, gpriv);
}
}
priv = wpa_s->ctrl_iface;
if (type != WPA_MSG_ONLY_GLOBAL && priv) {
if (!dl_list_empty(&priv->msg_queue) ||
wpas_ctrl_iface_throttle(priv->sock)) {
if (priv->throttle_count == 0) {
wpa_printf(MSG_MSGDUMP,
"CTRL: Had to throttle event message for sock %d",
priv->sock);
}
priv->throttle_count++;
wpas_ctrl_msg_queue_limit(priv->throttle_count,
&priv->msg_queue);
wpas_ctrl_msg_queue(&priv->msg_queue, wpa_s, level,
type, txt, len);
} else {
if (priv->throttle_count) {
wpa_printf(MSG_MSGDUMP,
"CTRL: Had to throttle %u event message(s) for sock %d",
priv->throttle_count, priv->sock);
}
priv->throttle_count = 0;
wpa_supplicant_ctrl_iface_send(wpa_s, NULL, priv->sock,
&priv->ctrl_dst, level,
txt, len, priv, NULL);
}
}
}
static int wpas_ctrl_iface_open_sock(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;
int flags;
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) {
priv->android_control_socket = 1;
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 {
wpa_printf(MSG_ERROR, "mkdir[ctrl_interface=%s]: %s",
dir, strerror(errno));
goto fail;
}
}
#ifdef ANDROID
/*
* wpa_supplicant is started from /init.*.rc on Android and that seems
* to be using umask 0077 which would leave the control interface
* directory without group access. This breaks things since Wi-Fi
* framework assumes that this directory can be accessed by other
* applications in the wifi group. Fix this by adding group access even
* if umask value would prevent this.
*/
if (chmod(dir, S_IRWXU | S_IRWXG) < 0) {
wpa_printf(MSG_ERROR, "CTRL: Could not chmod directory: %s",
strerror(errno));
/* Try to continue anyway */
}
#endif /* ANDROID */
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) {
wpa_printf(MSG_ERROR, "chown[ctrl_interface=%s,gid=%d]: %s",
dir, (int) gid, strerror(errno));
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) {
wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
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) {
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) {
wpa_printf(MSG_ERROR, "supp-ctrl-iface-init: bind(PF_UNIX): %s",
strerror(errno));
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) {
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) {
wpa_printf(MSG_ERROR, "chmod[ctrl_interface=%s]: %s",
fname, strerror(errno));
goto fail;
}
os_free(fname);
#ifdef ANDROID
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_ctrl_iface_receive,
wpa_s, priv);
wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
os_free(buf);
return 0;
fail:
if (priv->sock >= 0) {
close(priv->sock);
priv->sock = -1;
}
if (fname) {
unlink(fname);
os_free(fname);
}
os_free(buf);
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);
dl_list_init(&priv->msg_queue);
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;
}
void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
{
struct wpa_ctrl_dst *dst, *prev;
struct ctrl_iface_msg *msg, *prev_msg;
struct ctrl_iface_global_priv *gpriv;
if (priv->sock > -1) {
char *fname;
char *buf, *dir = NULL;
eloop_unregister_read_sock(priv->sock);
if (!dl_list_empty(&priv->ctrl_dst)) {
/*
* 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(0, 100000);
}
close(priv->sock);
priv->sock = -1;
fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
if (fname) {
unlink(fname);
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)
*gid_str = '\0';
} else
dir = buf;
if (rmdir(dir) < 0) {
if (errno == ENOTEMPTY) {
wpa_printf(MSG_DEBUG, "Control interface "
"directory not empty - leaving it "
"behind");
} else {
wpa_printf(MSG_ERROR,
"rmdir[ctrl_interface=%s]: %s",
dir, strerror(errno));
}
}
os_free(buf);
}
free_dst:
dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
list)
os_free(dst);
dl_list_for_each_safe(msg, prev_msg, &priv->msg_queue,
struct ctrl_iface_msg, list) {
dl_list_del(&msg->list);
os_free(msg);
}
gpriv = priv->wpa_s->global->ctrl_iface;
if (gpriv) {
dl_list_for_each_safe(msg, prev_msg, &gpriv->msg_queue,
struct ctrl_iface_msg, list) {
if (msg->wpa_s == priv->wpa_s) {
dl_list_del(&msg->list);
os_free(msg);
}
}
}
eloop_cancel_timeout(wpas_ctrl_msg_queue_timeout, priv->wpa_s, NULL);
os_free(priv);
}
/**
* wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
* @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 wpa_supplicant *wpa_s,
const char *ifname, int sock,
struct dl_list *ctrl_dst,
int level, const char *buf,
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[5];
if (sock < 0 || dl_list_empty(ctrl_dst))
return;
res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
if (os_snprintf_error(sizeof(levelstr), res))
return;
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 = idx;
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;
wpas_ctrl_sock_debug("ctrl_sock-sendmsg", sock, buf, len);
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;
}
}
}
}
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) {
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->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 {
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 */
if (sendto(priv->sock, "FAIL\n", 5, 0,
(struct sockaddr *) &from, fromlen) < 0) {
wpa_printf(MSG_DEBUG,
"ctrl_iface sendto failed: %s",
strerror(errno));
}
}
}
}
/* Global ctrl_iface */
static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
void *sock_ctx)
{
struct wpa_global *global = eloop_ctx;
struct ctrl_iface_global_priv *priv = sock_ctx;
char buf[4096];
int res;
struct sockaddr_un from;
socklen_t fromlen = sizeof(from);
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) {
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->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;
/*
* There could be some password/key material in the command, so
* clear the buffer explicitly now that it is not needed
* anymore.
*/
os_memset(buf, 0, res);
}
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) {
wpas_ctrl_sock_debug("global_ctrl_sock-sendto",
sock, reply, reply_len);
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);
}
static int wpas_global_ctrl_iface_open_sock(struct wpa_global *global,
struct ctrl_iface_global_priv *priv)
{
struct sockaddr_un addr;
const char *ctrl = global->params.ctrl_interface;
int flags;
wpa_printf(MSG_DEBUG, "Global control interface '%s'", ctrl);
#ifdef ANDROID
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;
}
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) {
wpa_printf(MSG_ERROR, "socket(PF_UNIX): %s", strerror(errno));
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;
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) {
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(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) {
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'",
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",
ctrl);
goto fail;
}
}
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:
/*
* 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, priv);
return 0;
fail:
if (priv->sock >= 0) {
close(priv->sock);
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);
dl_list_init(&priv->msg_queue);
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;
struct ctrl_iface_msg *msg, *prev_msg;
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);
dl_list_for_each_safe(msg, prev_msg, &priv->msg_queue,
struct ctrl_iface_msg, list) {
dl_list_del(&msg->list);
os_free(msg);
}
os_free(priv);
}