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/*
* wpa_supplicant/hostapd control interface library
* Copyright (c) 2004-2007, 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"

#ifdef CONFIG_CTRL_IFACE

#ifdef CONFIG_CTRL_IFACE_UNIX
#include <sys/un.h>
#endif /* CONFIG_CTRL_IFACE_UNIX */
#ifdef ANDROID
#include <dirent.h>
#include <linux/limits.h>
#include <cutils/sockets.h>
#include <cutils/memory.h>
#include "private/android_filesystem_config.h"
#endif

#include "wpa_ctrl.h"
#include "common.h"


#if defined(CONFIG_CTRL_IFACE_UNIX) || defined(CONFIG_CTRL_IFACE_UDP)
#define CTRL_IFACE_SOCKET
#ifdef ANDROID
static const char *local_socket_dir = "/data/misc/wifi/sockets";
static const char *local_socket_prefix = "wpa_ctrl_";
#endif /* ANDROID */
#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;
#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

struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
{
struct wpa_ctrl *ctrl;
static int counter = 0;

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;
os_snprintf(ctrl->local.sun_path, sizeof(ctrl->local.sun_path),
#ifdef ANDROID
"%s/%s%d-%d", local_socket_dir, local_socket_prefix,
                    getpid(), counter++);
#else /* ANDROID */
"/tmp/wpa_ctrl_%d-%d", getpid(), counter++);
#endif
if (bind(ctrl->s, (struct sockaddr *) &ctrl->local,
sizeof(ctrl->local)) < 0) {
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 != '/') {
os_snprintf(ctrl->dest.sun_path, sizeof(ctrl->dest.sun_path), "wpa_%s",
ctrl_path);
if (socket_local_client_connect(ctrl->s,
ctrl->dest.sun_path,
ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_DGRAM) < 0) {
close(ctrl->s);
unlink(ctrl->local.sun_path);
os_free(ctrl);
return NULL;
}
return ctrl;
}
#endif
ctrl->dest.sun_family = AF_UNIX;
os_snprintf(ctrl->dest.sun_path, sizeof(ctrl->dest.sun_path), "%s",
ctrl_path);
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;
}

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 = strlen(local_socket_prefix);
    size_t maxcopy;
    char pathname[PATH_MAX];
    char *namep;

    if ((dir = opendir(local_socket_dir)) == NULL)
        return;

    dirnamelen = (size_t)snprintf(pathname, sizeof(pathname), "%s/", local_socket_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 (strncmp(entry.d_name, local_socket_prefix, prefixlen) == 0) {
            if (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;

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;
ctrl->local.sin_addr.s_addr = htonl((127 << 24) | 1);
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);
if (connect(ctrl->s, (struct sockaddr *) &ctrl->dest,
sizeof(ctrl->dest)) < 0) {
perror("connect");
close(ctrl->s);
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 = strdup(buf);
}

return ctrl;
}


void wpa_ctrl_close(struct wpa_ctrl *ctrl)
{
close(ctrl->s);
os_free(ctrl->cookie);
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;
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 = strlen(ctrl->cookie) + 1 + cmd_len;
cmd_buf = os_malloc(_cmd_len );
if (cmd_buf == NULL)
return -1;
_cmd = cmd_buf;
pos = cmd_buf;
strcpy(pos, ctrl->cookie);
pos += strlen(ctrl->cookie);
*pos++ = ' ';
memcpy(pos, cmd, cmd_len);
} else
#endif /* CONFIG_CTRL_IFACE_UDP */
{
_cmd = cmd;
_cmd_len = cmd_len;
}

if (send(ctrl->s, _cmd, _cmd_len, 0) < 0) {
os_free(cmd_buf);
return -1;
}
os_free(cmd_buf);

for (;;) {
#ifdef ANDROID
tv.tv_sec = 10;
#else
tv.tv_sec = 2;
#endif
tv.tv_usec = 0;
FD_ZERO(&rfds);
FD_SET(ctrl->s, &rfds);
res = select(ctrl->s + 1, &rfds, NULL, NULL, &tv);
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;

ctrl = os_malloc(sizeof(*ctrl));
if (ctrl == NULL)
return NULL;
os_memset(ctrl, 0, sizeof(*ctrl));

#ifdef UNICODE
if (ctrl_path == NULL)
_snwprintf(name, 256, NAMED_PIPE_PREFIX);
else
_snwprintf(name, 256, NAMED_PIPE_PREFIX TEXT("-%S"),
ctrl_path);
#else /* UNICODE */
if (ctrl_path == NULL)
os_snprintf(name, 256, NAMED_PIPE_PREFIX);
else
os_snprintf(name, 256, NAMED_PIPE_PREFIX "-%s",
ctrl_path);
#endif /* UNICODE */

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 ctrl->pipe;
}

#endif /* CONFIG_CTRL_IFACE_NAMED_PIPE */

#endif /* CONFIG_CTRL_IFACE */
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