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/*
* wpa_supplicant/hostapd control interface library
* Copyright (c) 2004-2007, 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"
#ifdef CONFIG_CTRL_IFACE
#ifdef CONFIG_CTRL_IFACE_UNIX
#include <sys/un.h>
#include <unistd.h>
#include <fcntl.h>
#endif /* CONFIG_CTRL_IFACE_UNIX */
#ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
#include <netdb.h>
#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
#ifdef ANDROID
#include <dirent.h>
#include <cutils/sockets.h>
#include "private/android_filesystem_config.h"
#endif /* ANDROID */
#include "wpa_ctrl.h"
#include "common.h"
#if defined(CONFIG_CTRL_IFACE_UNIX) || defined(CONFIG_CTRL_IFACE_UDP)
#define CTRL_IFACE_SOCKET
#endif /* CONFIG_CTRL_IFACE_UNIX || CONFIG_CTRL_IFACE_UDP */
/**
* struct wpa_ctrl - Internal structure for control interface library
*
* This structure is used by the wpa_supplicant/hostapd control interface
* library to store internal data. Programs using the library should not touch
* this data directly. They can only use the pointer to the data structure as
* an identifier for the control interface connection and use this as one of
* the arguments for most of the control interface library functions.
*/
struct wpa_ctrl {
#ifdef CONFIG_CTRL_IFACE_UDP
int s;
struct sockaddr_in local;
struct sockaddr_in dest;
char *cookie;
char *remote_ifname;
char *remote_ip;
#endif /* CONFIG_CTRL_IFACE_UDP */
#ifdef CONFIG_CTRL_IFACE_UNIX
int s;
struct sockaddr_un local;
struct sockaddr_un dest;
#endif /* CONFIG_CTRL_IFACE_UNIX */
#ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
HANDLE pipe;
#endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
};
#ifdef CONFIG_CTRL_IFACE_UNIX
#ifndef CONFIG_CTRL_IFACE_CLIENT_DIR
#define CONFIG_CTRL_IFACE_CLIENT_DIR "/tmp"
#endif /* CONFIG_CTRL_IFACE_CLIENT_DIR */
#ifndef CONFIG_CTRL_IFACE_CLIENT_PREFIX
#define CONFIG_CTRL_IFACE_CLIENT_PREFIX "wpa_ctrl_"
#endif /* CONFIG_CTRL_IFACE_CLIENT_PREFIX */
struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
{
struct wpa_ctrl *ctrl;
static int counter = 0;
int ret;
size_t res;
int tries = 0;
int flags;
ctrl = os_malloc(sizeof(*ctrl));
if (ctrl == NULL)
return NULL;
os_memset(ctrl, 0, sizeof(*ctrl));
ctrl->s = socket(PF_UNIX, SOCK_DGRAM, 0);
if (ctrl->s < 0) {
os_free(ctrl);
return NULL;
}
ctrl->local.sun_family = AF_UNIX;
counter++;
try_again:
ret = os_snprintf(ctrl->local.sun_path, sizeof(ctrl->local.sun_path),
CONFIG_CTRL_IFACE_CLIENT_DIR "/"
CONFIG_CTRL_IFACE_CLIENT_PREFIX "%d-%d",
(int) getpid(), counter);
if (ret < 0 || (size_t) ret >= sizeof(ctrl->local.sun_path)) {
close(ctrl->s);
os_free(ctrl);
return NULL;
}
tries++;
if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
sizeof(ctrl->local)) < 0) {
if (errno == EADDRINUSE && tries < 2) {
/*
* getpid() returns unique identifier for this instance
* of wpa_ctrl, so the existing socket file must have
* been left by unclean termination of an earlier run.
* Remove the file and try again.
*/
unlink(ctrl->local.sun_path);
goto try_again;
}
close(ctrl->s);
os_free(ctrl);
return NULL;
}
#ifdef ANDROID
chmod(ctrl->local.sun_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
chown(ctrl->local.sun_path, AID_SYSTEM, AID_WIFI);
/*
* If the ctrl_path isn't an absolute pathname, assume that
* it's the name of a socket in the Android reserved namespace.
* Otherwise, it's a normal UNIX domain socket appearing in the
* filesystem.
*/
if (ctrl_path != NULL && *ctrl_path != '/') {
char buf[21];
os_snprintf(buf, sizeof(buf), "wpa_%s", ctrl_path);
if (socket_local_client_connect(
ctrl->s, buf,
ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_DGRAM) < 0) {
close(ctrl->s);
unlink(ctrl->local.sun_path);
os_free(ctrl);
return NULL;
}
return ctrl;
}
#endif /* ANDROID */
ctrl->dest.sun_family = AF_UNIX;
res = os_strlcpy(ctrl->dest.sun_path, ctrl_path,
sizeof(ctrl->dest.sun_path));
if (res >= sizeof(ctrl->dest.sun_path)) {
close(ctrl->s);
os_free(ctrl);
return NULL;
}
if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
sizeof(ctrl->dest)) < 0) {
close(ctrl->s);
unlink(ctrl->local.sun_path);
os_free(ctrl);
return NULL;
}
/*
* Make socket non-blocking so that we don't hang forever if
* target dies unexpectedly.
*/
flags = fcntl(ctrl->s, F_GETFL);
if (flags >= 0) {
flags |= O_NONBLOCK;
if (fcntl(ctrl->s, F_SETFL, flags) < 0) {
perror("fcntl(ctrl->s, O_NONBLOCK)");
/* Not fatal, continue on.*/
}
}
return ctrl;
}
void wpa_ctrl_close(struct wpa_ctrl *ctrl)
{
if (ctrl == NULL)
return;
unlink(ctrl->local.sun_path);
if (ctrl->s >= 0)
close(ctrl->s);
os_free(ctrl);
}
#ifdef ANDROID
/**
* wpa_ctrl_cleanup() - Delete any local UNIX domain socket files that
* may be left over from clients that were previously connected to
* wpa_supplicant. This keeps these files from being orphaned in the
* event of crashes that prevented them from being removed as part
* of the normal orderly shutdown.
*/
void wpa_ctrl_cleanup(void)
{
DIR *dir;
struct dirent entry;
struct dirent *result;
size_t dirnamelen;
int prefixlen = os_strlen(CONFIG_CTRL_IFACE_CLIENT_PREFIX);
size_t maxcopy;
char pathname[PATH_MAX];
char *namep;
if ((dir = opendir(CONFIG_CTRL_IFACE_CLIENT_DIR)) == NULL)
return;
dirnamelen = (size_t) os_snprintf(pathname, sizeof(pathname), "%s/",
CONFIG_CTRL_IFACE_CLIENT_DIR);
if (dirnamelen >= sizeof(pathname)) {
closedir(dir);
return;
}
namep = pathname + dirnamelen;
maxcopy = PATH_MAX - dirnamelen;
while (readdir_r(dir, &entry, &result) == 0 && result != NULL) {
if (os_strncmp(entry.d_name, CONFIG_CTRL_IFACE_CLIENT_PREFIX,
prefixlen) == 0) {
if (os_strlcpy(namep, entry.d_name, maxcopy) < maxcopy)
unlink(pathname);
}
}
closedir(dir);
}
#endif /* ANDROID */
#else /* CONFIG_CTRL_IFACE_UNIX */
#ifdef ANDROID
void wpa_ctrl_cleanup(void)
{
}
#endif /* ANDROID */
#endif /* CONFIG_CTRL_IFACE_UNIX */
#ifdef CONFIG_CTRL_IFACE_UDP
struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
{
struct wpa_ctrl *ctrl;
char buf[128];
size_t len;
#ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
struct hostent *h;
#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
ctrl = os_malloc(sizeof(*ctrl));
if (ctrl == NULL)
return NULL;
os_memset(ctrl, 0, sizeof(*ctrl));
ctrl->s = socket(PF_INET, SOCK_DGRAM, 0);
if (ctrl->s < 0) {
perror("socket");
os_free(ctrl);
return NULL;
}
ctrl->local.sin_family = AF_INET;
#ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
ctrl->local.sin_addr.s_addr = INADDR_ANY;
#else /* CONFIG_CTRL_IFACE_UDP_REMOTE */
ctrl->local.sin_addr.s_addr = htonl((127 << 24) | 1);
#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
sizeof(ctrl->local)) < 0) {
close(ctrl->s);
os_free(ctrl);
return NULL;
}
ctrl->dest.sin_family = AF_INET;
ctrl->dest.sin_addr.s_addr = htonl((127 << 24) | 1);
ctrl->dest.sin_port = htons(WPA_CTRL_IFACE_PORT);
#ifdef CONFIG_CTRL_IFACE_UDP_REMOTE
if (ctrl_path) {
char *port, *name;
int port_id;
name = os_strdup(ctrl_path);
if (name == NULL) {
close(ctrl->s);
os_free(ctrl);
return NULL;
}
port = os_strchr(name, ':');
if (port) {
port_id = atoi(&port[1]);
port[0] = '\0';
} else
port_id = WPA_CTRL_IFACE_PORT;
h = gethostbyname(name);
ctrl->remote_ip = os_strdup(name);
os_free(name);
if (h == NULL) {
perror("gethostbyname");
close(ctrl->s);
os_free(ctrl->remote_ip);
os_free(ctrl);
return NULL;
}
ctrl->dest.sin_port = htons(port_id);
os_memcpy(h->h_addr, (char *) &ctrl->dest.sin_addr.s_addr,
h->h_length);
} else
ctrl->remote_ip = os_strdup("localhost");
#endif /* CONFIG_CTRL_IFACE_UDP_REMOTE */
if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
sizeof(ctrl->dest)) < 0) {
perror("connect");
close(ctrl->s);
os_free(ctrl->remote_ip);
os_free(ctrl);
return NULL;
}
len = sizeof(buf) - 1;
if (wpa_ctrl_request(ctrl, "GET_COOKIE", 10, buf, &len, NULL) == 0) {
buf[len] = '\0';
ctrl->cookie = os_strdup(buf);
}
if (wpa_ctrl_request(ctrl, "IFNAME", 6, buf, &len, NULL) == 0) {
buf[len] = '\0';
ctrl->remote_ifname = os_strdup(buf);
}
return ctrl;
}
char * wpa_ctrl_get_remote_ifname(struct wpa_ctrl *ctrl)
{
#define WPA_CTRL_MAX_PS_NAME 100
static char ps[WPA_CTRL_MAX_PS_NAME] = {};
os_snprintf(ps, WPA_CTRL_MAX_PS_NAME, "%s/%s",
ctrl->remote_ip, ctrl->remote_ifname);
return ps;
}
void wpa_ctrl_close(struct wpa_ctrl *ctrl)
{
close(ctrl->s);
os_free(ctrl->cookie);
os_free(ctrl->remote_ifname);
os_free(ctrl->remote_ip);
os_free(ctrl);
}
#endif /* CONFIG_CTRL_IFACE_UDP */
#ifdef CTRL_IFACE_SOCKET
int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
char *reply, size_t *reply_len,
void (*msg_cb)(char *msg, size_t len))
{
struct timeval tv;
struct os_time started_at;
int res;
fd_set rfds;
const char *_cmd;
char *cmd_buf = NULL;
size_t _cmd_len;
#ifdef CONFIG_CTRL_IFACE_UDP
if (ctrl->cookie) {
char *pos;
_cmd_len = os_strlen(ctrl->cookie) + 1 + cmd_len;
cmd_buf = os_malloc(_cmd_len);
if (cmd_buf == NULL)
return -1;
_cmd = cmd_buf;
pos = cmd_buf;
os_strlcpy(pos, ctrl->cookie, _cmd_len);
pos += os_strlen(ctrl->cookie);
*pos++ = ' ';
os_memcpy(pos, cmd, cmd_len);
} else
#endif /* CONFIG_CTRL_IFACE_UDP */
{
_cmd = cmd;
_cmd_len = cmd_len;
}
errno = 0;
started_at.sec = 0;
started_at.usec = 0;
retry_send:
if (send(ctrl->s, _cmd, _cmd_len, 0) < 0) {
if (errno == EAGAIN || errno == EBUSY || errno == EWOULDBLOCK)
{
/*
* Must be a non-blocking socket... Try for a bit
* longer before giving up.
*/
if (started_at.sec == 0)
os_get_time(&started_at);
else {
struct os_time n;
os_get_time(&n);
/* Try for a few seconds. */
if (n.sec > started_at.sec + 5)
goto send_err;
}
os_sleep(1, 0);
goto retry_send;
}
send_err:
os_free(cmd_buf);
return -1;
}
os_free(cmd_buf);
for (;;) {
tv.tv_sec = 10;
tv.tv_usec = 0;
FD_ZERO(&rfds);
FD_SET(ctrl->s, &rfds);
res = select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
if (res < 0)
return res;
if (FD_ISSET(ctrl->s, &rfds)) {
res = recv(ctrl->s, reply, *reply_len, 0);
if (res < 0)
return res;
if (res > 0 && reply[0] == '<') {
/* This is an unsolicited message from
* wpa_supplicant, not the reply to the
* request. Use msg_cb to report this to the
* caller. */
if (msg_cb) {
/* Make sure the message is nul
* terminated. */
if ((size_t) res == *reply_len)
res = (*reply_len) - 1;
reply[res] = '\0';
msg_cb(reply, res);
}
continue;
}
*reply_len = res;
break;
} else {
return -2;
}
}
return 0;
}
#endif /* CTRL_IFACE_SOCKET */
static int wpa_ctrl_attach_helper(struct wpa_ctrl *ctrl, int attach)
{
char buf[10];
int ret;
size_t len = 10;
ret = wpa_ctrl_request(ctrl, attach ? "ATTACH" : "DETACH", 6,
buf, &len, NULL);
if (ret < 0)
return ret;
if (len == 3 && os_memcmp(buf, "OK\n", 3) == 0)
return 0;
return -1;
}
int wpa_ctrl_attach(struct wpa_ctrl *ctrl)
{
return wpa_ctrl_attach_helper(ctrl, 1);
}
int wpa_ctrl_detach(struct wpa_ctrl *ctrl)
{
return wpa_ctrl_attach_helper(ctrl, 0);
}
#ifdef CTRL_IFACE_SOCKET
int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
{
int res;
res = recv(ctrl->s, reply, *reply_len, 0);
if (res < 0)
return res;
*reply_len = res;
return 0;
}
int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
{
struct timeval tv;
fd_set rfds;
tv.tv_sec = 0;
tv.tv_usec = 0;
FD_ZERO(&rfds);
FD_SET(ctrl->s, &rfds);
select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
return FD_ISSET(ctrl->s, &rfds);
}
int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
{
return ctrl->s;
}
#endif /* CTRL_IFACE_SOCKET */
#ifdef CONFIG_CTRL_IFACE_NAMED_PIPE
#ifndef WPA_SUPPLICANT_NAMED_PIPE
#define WPA_SUPPLICANT_NAMED_PIPE "WpaSupplicant"
#endif
#define NAMED_PIPE_PREFIX TEXT("\\\\.\\pipe\\") TEXT(WPA_SUPPLICANT_NAMED_PIPE)
struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
{
struct wpa_ctrl *ctrl;
DWORD mode;
TCHAR name[256];
int i, ret;
ctrl = os_malloc(sizeof(*ctrl));
if (ctrl == NULL)
return NULL;
os_memset(ctrl, 0, sizeof(*ctrl));
#ifdef UNICODE
if (ctrl_path == NULL)
ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX);
else
ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX TEXT("-%S"),
ctrl_path);
#else /* UNICODE */
if (ctrl_path == NULL)
ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX);
else
ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX "-%s",
ctrl_path);
#endif /* UNICODE */
if (ret < 0 || ret >= 256) {
os_free(ctrl);
return NULL;
}
for (i = 0; i < 10; i++) {
ctrl->pipe = CreateFile(name, GENERIC_READ | GENERIC_WRITE, 0,
NULL, OPEN_EXISTING, 0, NULL);
/*
* Current named pipe server side in wpa_supplicant is
* re-opening the pipe for new clients only after the previous
* one is taken into use. This leaves a small window for race
* conditions when two connections are being opened at almost
* the same time. Retry if that was the case.
*/
if (ctrl->pipe != INVALID_HANDLE_VALUE ||
GetLastError() != ERROR_PIPE_BUSY)
break;
WaitNamedPipe(name, 1000);
}
if (ctrl->pipe == INVALID_HANDLE_VALUE) {
os_free(ctrl);
return NULL;
}
mode = PIPE_READMODE_MESSAGE;
if (!SetNamedPipeHandleState(ctrl->pipe, &mode, NULL, NULL)) {
CloseHandle(ctrl->pipe);
os_free(ctrl);
return NULL;
}
return ctrl;
}
void wpa_ctrl_close(struct wpa_ctrl *ctrl)
{
CloseHandle(ctrl->pipe);
os_free(ctrl);
}
int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
char *reply, size_t *reply_len,
void (*msg_cb)(char *msg, size_t len))
{
DWORD written;
DWORD readlen = *reply_len;
if (!WriteFile(ctrl->pipe, cmd, cmd_len, &written, NULL))
return -1;
if (!ReadFile(ctrl->pipe, reply, *reply_len, &readlen, NULL))
return -1;
*reply_len = readlen;
return 0;
}
int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
{
DWORD len = *reply_len;
if (!ReadFile(ctrl->pipe, reply, *reply_len, &len, NULL))
return -1;
*reply_len = len;
return 0;
}
int wpa_ctrl_pending(struct wpa_ctrl *ctrl)
{
DWORD left;
if (!PeekNamedPipe(ctrl->pipe, NULL, 0, NULL, &left, NULL))
return -1;
return left ? 1 : 0;
}
int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl)
{
return -1;
}
#endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */
#endif /* CONFIG_CTRL_IFACE */