/*
* Copyright 2008, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include "hardware_legacy/wifi.h"
#include "libwpa_client/wpa_ctrl.h"
#define LOG_TAG "WifiHW"
#include "cutils/log.h"
#include "cutils/memory.h"
#include "cutils/misc.h"
#include "cutils/properties.h"
#include "private/android_filesystem_config.h"
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include <sys/_system_properties.h>
#endif
static struct wpa_ctrl *ctrl_conn;
static struct wpa_ctrl *monitor_conn;
extern int do_dhcp();
extern int ifc_init();
extern void ifc_close();
extern char *dhcp_lasterror();
extern void get_dhcp_info();
extern int init_module(void *, unsigned long, const char *);
extern int delete_module(const char *, unsigned int);
static char iface[PROPERTY_VALUE_MAX];
// TODO: use new ANDROID_SOCKET mechanism, once support for multiple
// sockets is in
#ifndef WIFI_DRIVER_MODULE_PATH
#define WIFI_DRIVER_MODULE_PATH "/system/lib/modules/wlan.ko"
#endif
#ifndef WIFI_DRIVER_MODULE_NAME
#define WIFI_DRIVER_MODULE_NAME "wlan"
#endif
#ifndef WIFI_DRIVER_MODULE_ARG
#define WIFI_DRIVER_MODULE_ARG ""
#endif
#ifndef WIFI_FIRMWARE_LOADER
#define WIFI_FIRMWARE_LOADER ""
#endif
#define WIFI_TEST_INTERFACE "sta"
#define WIFI_DRIVER_LOADER_DELAY 1000000
static const char IFACE_DIR[] = "/data/system/wpa_supplicant";
static const char DRIVER_MODULE_NAME[] = WIFI_DRIVER_MODULE_NAME;
static const char DRIVER_MODULE_TAG[] = WIFI_DRIVER_MODULE_NAME " ";
static const char DRIVER_MODULE_PATH[] = WIFI_DRIVER_MODULE_PATH;
static const char DRIVER_MODULE_ARG[] = WIFI_DRIVER_MODULE_ARG;
static const char FIRMWARE_LOADER[] = WIFI_FIRMWARE_LOADER;
static const char DRIVER_PROP_NAME[] = "wlan.driver.status";
static const char SUPPLICANT_NAME[] = "wpa_supplicant";
static const char SUPP_PROP_NAME[] = "init.svc.wpa_supplicant";
static const char SUPP_CONFIG_TEMPLATE[]= "/system/etc/wifi/wpa_supplicant.conf";
static const char SUPP_CONFIG_FILE[] = "/data/misc/wifi/wpa_supplicant.conf";
static const char MODULE_FILE[] = "/proc/modules";
static int insmod(const char *filename, const char *args)
{
void *module;
unsigned int size;
int ret;
module = load_file(filename, &size);
if (!module)
return -1;
ret = init_module(module, size, args);
free(module);
return ret;
}
static int rmmod(const char *modname)
{
int ret = -1;
int maxtry = 10;
while (maxtry-- > 0) {
ret = delete_module(modname, O_NONBLOCK | O_EXCL);
if (ret < 0 && errno == EAGAIN)
usleep(500000);
else
break;
}
if (ret != 0)
LOGD("Unable to unload driver module \"%s\": %s\n",
modname, strerror(errno));
return ret;
}
int do_dhcp_request(int *ipaddr, int *gateway, int *mask,
int *dns1, int *dns2, int *server, int *lease) {
/* For test driver, always report success */
if (strcmp(iface, WIFI_TEST_INTERFACE) == 0)
return 0;
if (ifc_init() < 0)
return -1;
if (do_dhcp(iface) < 0) {
ifc_close();
return -1;
}
ifc_close();
get_dhcp_info(ipaddr, gateway, mask, dns1, dns2, server, lease);
return 0;
}
const char *get_dhcp_error_string() {
return dhcp_lasterror();
}
static int check_driver_loaded() {
char driver_status[PROPERTY_VALUE_MAX];
FILE *proc;
char line[sizeof(DRIVER_MODULE_TAG)+10];
if (!property_get(DRIVER_PROP_NAME, driver_status, NULL)
|| strcmp(driver_status, "ok") != 0) {
return 0; /* driver not loaded */
}
/*
* If the property says the driver is loaded, check to
* make sure that the property setting isn't just left
* over from a previous manual shutdown or a runtime
* crash.
*/
if ((proc = fopen(MODULE_FILE, "r")) == NULL) {
LOGW("Could not open %s: %s", MODULE_FILE, strerror(errno));
property_set(DRIVER_PROP_NAME, "unloaded");
return 0;
}
while ((fgets(line, sizeof(line), proc)) != NULL) {
if (strncmp(line, DRIVER_MODULE_TAG, strlen(DRIVER_MODULE_TAG)) == 0) {
fclose(proc);
return 1;
}
}
fclose(proc);
property_set(DRIVER_PROP_NAME, "unloaded");
return 0;
}
int wifi_load_driver()
{
char driver_status[PROPERTY_VALUE_MAX];
int count = 100; /* wait at most 20 seconds for completion */
if (check_driver_loaded()) {
return 0;
}
if (insmod(DRIVER_MODULE_PATH, DRIVER_MODULE_ARG) < 0)
return -1;
if (strcmp(FIRMWARE_LOADER,"") == 0) {
usleep(WIFI_DRIVER_LOADER_DELAY);
property_set(DRIVER_PROP_NAME, "ok");
}
else {
property_set("ctl.start", FIRMWARE_LOADER);
}
sched_yield();
while (count-- > 0) {
if (property_get(DRIVER_PROP_NAME, driver_status, NULL)) {
if (strcmp(driver_status, "ok") == 0)
return 0;
else if (strcmp(DRIVER_PROP_NAME, "failed") == 0) {
wifi_unload_driver();
return -1;
}
}
usleep(200000);
}
property_set(DRIVER_PROP_NAME, "timeout");
wifi_unload_driver();
return -1;
}
int wifi_unload_driver()
{
int count = 20; /* wait at most 10 seconds for completion */
if (rmmod(DRIVER_MODULE_NAME) == 0) {
while (count-- > 0) {
if (!check_driver_loaded())
break;
usleep(500000);
}
if (count) {
return 0;
}
return -1;
} else
return -1;
}
int ensure_config_file_exists()
{
char buf[2048];
int srcfd, destfd;
int nread;
if (access(SUPP_CONFIG_FILE, R_OK|W_OK) == 0) {
return 0;
} else if (errno != ENOENT) {
LOGE("Cannot access \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));
return -1;
}
srcfd = open(SUPP_CONFIG_TEMPLATE, O_RDONLY);
if (srcfd < 0) {
LOGE("Cannot open \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
return -1;
}
destfd = open(SUPP_CONFIG_FILE, O_CREAT|O_WRONLY, 0660);
if (destfd < 0) {
close(srcfd);
LOGE("Cannot create \"%s\": %s", SUPP_CONFIG_FILE, strerror(errno));
return -1;
}
while ((nread = read(srcfd, buf, sizeof(buf))) != 0) {
if (nread < 0) {
LOGE("Error reading \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
close(srcfd);
close(destfd);
unlink(SUPP_CONFIG_FILE);
return -1;
}
write(destfd, buf, nread);
}
close(destfd);
close(srcfd);
if (chown(SUPP_CONFIG_FILE, AID_SYSTEM, AID_WIFI) < 0) {
LOGE("Error changing group ownership of %s to %d: %s",
SUPP_CONFIG_FILE, AID_WIFI, strerror(errno));
unlink(SUPP_CONFIG_FILE);
return -1;
}
return 0;
}
int wifi_start_supplicant()
{
char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
int count = 200; /* wait at most 20 seconds for completion */
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
const prop_info *pi;
unsigned serial = 0;
#endif
/* Check whether already running */
if (property_get(SUPP_PROP_NAME, supp_status, NULL)
&& strcmp(supp_status, "running") == 0) {
return 0;
}
/* Before starting the daemon, make sure its config file exists */
if (ensure_config_file_exists() < 0) {
LOGE("Wi-Fi will not be enabled");
return -1;
}
/* Clear out any stale socket files that might be left over. */
wpa_ctrl_cleanup();
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
/*
* Get a reference to the status property, so we can distinguish
* the case where it goes stopped => running => stopped (i.e.,
* it start up, but fails right away) from the case in which
* it starts in the stopped state and never manages to start
* running at all.
*/
pi = __system_property_find(SUPP_PROP_NAME);
if (pi != NULL) {
serial = pi->serial;
}
#endif
property_set("ctl.start", SUPPLICANT_NAME);
sched_yield();
while (count-- > 0) {
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
if (pi == NULL) {
pi = __system_property_find(SUPP_PROP_NAME);
}
if (pi != NULL) {
__system_property_read(pi, NULL, supp_status);
if (strcmp(supp_status, "running") == 0) {
return 0;
} else if (pi->serial != serial &&
strcmp(supp_status, "stopped") == 0) {
return -1;
}
}
#else
if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {
if (strcmp(supp_status, "running") == 0)
return 0;
}
#endif
usleep(100000);
}
return -1;
}
int wifi_stop_supplicant()
{
char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
int count = 50; /* wait at most 5 seconds for completion */
/* Check whether supplicant already stopped */
if (property_get(SUPP_PROP_NAME, supp_status, NULL)
&& strcmp(supp_status, "stopped") == 0) {
return 0;
}
property_set("ctl.stop", SUPPLICANT_NAME);
sched_yield();
while (count-- > 0) {
if (property_get(SUPP_PROP_NAME, supp_status, NULL)) {
if (strcmp(supp_status, "stopped") == 0)
return 0;
}
usleep(100000);
}
return -1;
}
int wifi_connect_to_supplicant()
{
char ifname[256];
char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
/* Make sure supplicant is running */
if (!property_get(SUPP_PROP_NAME, supp_status, NULL)
|| strcmp(supp_status, "running") != 0) {
LOGE("Supplicant not running, cannot connect");
return -1;
}
property_get("wifi.interface", iface, WIFI_TEST_INTERFACE);
if (access(IFACE_DIR, F_OK) == 0) {
snprintf(ifname, sizeof(ifname), "%s/%s", IFACE_DIR, iface);
} else {
strlcpy(ifname, iface, sizeof(ifname));
}
ctrl_conn = wpa_ctrl_open(ifname);
if (ctrl_conn == NULL) {
LOGE("Unable to open connection to supplicant on \"%s\": %s",
ifname, strerror(errno));
return -1;
}
monitor_conn = wpa_ctrl_open(ifname);
if (monitor_conn == NULL) {
wpa_ctrl_close(ctrl_conn);
ctrl_conn = NULL;
return -1;
}
if (wpa_ctrl_attach(monitor_conn) != 0) {
wpa_ctrl_close(monitor_conn);
wpa_ctrl_close(ctrl_conn);
ctrl_conn = monitor_conn = NULL;
return -1;
}
return 0;
}
int wifi_send_command(struct wpa_ctrl *ctrl, const char *cmd, char *reply, size_t *reply_len)
{
int ret;
if (ctrl_conn == NULL) {
LOGV("Not connected to wpa_supplicant - \"%s\" command dropped.\n", cmd);
return -1;
}
ret = wpa_ctrl_request(ctrl, cmd, strlen(cmd), reply, reply_len, NULL);
if (ret == -2) {
LOGD("'%s' command timed out.\n", cmd);
return -2;
} else if (ret < 0 || strncmp(reply, "FAIL", 4) == 0) {
return -1;
}
if (strncmp(cmd, "PING", 4) == 0) {
reply[*reply_len] = '\0';
}
return 0;
}
int wifi_wait_for_event(char *buf, size_t buflen)
{
size_t nread = buflen - 1;
int fd;
fd_set rfds;
int result;
struct timeval tval;
struct timeval *tptr;
if (monitor_conn == NULL) {
LOGD("Connection closed\n");
strncpy(buf, WPA_EVENT_TERMINATING " - connection closed", buflen-1);
buf[buflen-1] = '\0';
return strlen(buf);
}
result = wpa_ctrl_recv(monitor_conn, buf, &nread);
if (result < 0) {
LOGD("wpa_ctrl_recv failed: %s\n", strerror(errno));
strncpy(buf, WPA_EVENT_TERMINATING " - recv error", buflen-1);
buf[buflen-1] = '\0';
return strlen(buf);
}
buf[nread] = '\0';
/* LOGD("wait_for_event: result=%d nread=%d string=\"%s\"\n", result, nread, buf); */
/* Check for EOF on the socket */
if (result == 0 && nread == 0) {
/* Fabricate an event to pass up */
LOGD("Received EOF on supplicant socket\n");
strncpy(buf, WPA_EVENT_TERMINATING " - signal 0 received", buflen-1);
buf[buflen-1] = '\0';
return strlen(buf);
}
/*
* Events strings are in the format
*
* <N>CTRL-EVENT-XXX
*
* where N is the message level in numerical form (0=VERBOSE, 1=DEBUG,
* etc.) and XXX is the event name. The level information is not useful
* to us, so strip it off.
*/
if (buf[0] == '<') {
char *match = strchr(buf, '>');
if (match != NULL) {
nread -= (match+1-buf);
memmove(buf, match+1, nread+1);
}
}
return nread;
}
void wifi_close_supplicant_connection()
{
if (ctrl_conn != NULL) {
wpa_ctrl_close(ctrl_conn);
ctrl_conn = NULL;
}
if (monitor_conn != NULL) {
wpa_ctrl_close(monitor_conn);
monitor_conn = NULL;
}
}
int wifi_command(const char *command, char *reply, size_t *reply_len)
{
return wifi_send_command(ctrl_conn, command, reply, reply_len);
}