platform_system_core/nexus/Supplicant.cpp

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/*
* Copyright (C) 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 <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#define LOG_TAG "Supplicant"
#include <cutils/log.h>
#include <cutils/properties.h>
#include "private/android_filesystem_config.h"
#undef HAVE_LIBC_SYSTEM_PROPERTIES
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include <sys/_system_properties.h>
#endif
#include "Supplicant.h"
#include "SupplicantListener.h"
#include "SupplicantState.h"
#include "SupplicantEvent.h"
#include "ScanResult.h"
#include "NetworkManager.h"
#include "ErrorCode.h"
#include "libwpa_client/wpa_ctrl.h"
#define IFACE_DIR "/data/system/wpa_supplicant"
#define DRIVER_PROP_NAME "wlan.driver.status"
#define SUPPLICANT_NAME "wpa_supplicant"
#define SUPP_PROP_NAME "init.svc.wpa_supplicant"
#define SUPP_CONFIG_TEMPLATE "/system/etc/wifi/wpa_supplicant.conf"
#define SUPP_CONFIG_FILE "/data/misc/wifi/wpa_supplicant.conf"
Supplicant::Supplicant() {
mCtrl = NULL;
mMonitor = NULL;
mListener = NULL;
mState = SupplicantState::UNKNOWN;
mLatestScanResults = new ScanResultCollection();
pthread_mutex_init(&mLatestScanResultsLock, NULL);
}
int Supplicant::start() {
if (setupConfig()) {
LOGW("Unable to setup supplicant.conf");
}
char status[PROPERTY_VALUE_MAX] = {'\0'};
int count = 200;
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
const prop_info *pi;
unsigned int serial = 0;
#endif
if (property_get(SUPP_PROP_NAME, status, NULL) &&
!strcmp(status, "running")) {
} else {
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
pi = __system_property_find(SUPP_PROP_NAME);
if (pi != NULL)
serial = pi->serial;
#endif
LOGD("Starting Supplicant");
property_set("ctl.start", SUPPLICANT_NAME);
sched_yield();
while (count--) {
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
if (!pi)
pi = __system_property_find(SUPP_PROP_NAME);
if (pi) {
__system_property_read(pi, NULL, status);
if (strcmp(status, "running") == 0)
break;
else if (pi->serial != serial &&
strcmp(status, "stopped") == 0) {
errno = EIO;
return -1;
}
}
#else
if (property_get(SUPP_PROP_NAME, status, NULL)) {
if (!strcmp(status, "running"))
break;
}
#endif
usleep(100000);
}
if (!count) {
errno = ETIMEDOUT;
return -1;
}
}
wpa_ctrl_cleanup();
if (connectToSupplicant()) {
LOGE("Error connecting to supplicant (%s)\n", strerror(errno));
return -1;
}
return 0;
}
int Supplicant::stop() {
char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
int count = 50;
if (mListener->stopListener()) {
LOGW("Unable to stop supplicant listener (%s)", strerror(errno));
return -1;
}
if (property_get(SUPP_PROP_NAME, supp_status, NULL)
&& strcmp(supp_status, "stopped") == 0) {
LOGD("Supplicant already stopped");
return 0;
}
LOGD("Stopping Supplicant");
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)
break;
}
usleep(100000);
}
if (mCtrl) {
wpa_ctrl_close(mCtrl);
mCtrl = NULL;
}
if (mMonitor) {
wpa_ctrl_close(mMonitor);
mMonitor = NULL;
}
if (!count) {
LOGD("Timed out waiting for supplicant to stop");
errno = ETIMEDOUT;
return -1;
}
LOGD("Supplicant shutdown");
return 0;
}
bool Supplicant::isStarted() {
char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
property_get(SUPP_PROP_NAME, supp_status, NULL);
if (!strcmp(supp_status, "running"))
return true;
return false;
}
int Supplicant::connectToSupplicant() {
char ifname[256];
char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
LOGD("connectToSupplicant()");
if (!property_get(SUPP_PROP_NAME, supp_status, NULL)
|| strcmp(supp_status, "running") != 0) {
LOGE("Supplicant not running, cannot connect");
return -1;
}
mCtrl = wpa_ctrl_open("tiwlan0");
if (mCtrl == NULL) {
LOGE("Unable to open connection to supplicant on \"%s\": %s",
"tiwlan0", strerror(errno));
return -1;
}
mMonitor = wpa_ctrl_open("tiwlan0");
if (mMonitor == NULL) {
wpa_ctrl_close(mCtrl);
mCtrl = NULL;
return -1;
}
if (wpa_ctrl_attach(mMonitor) != 0) {
wpa_ctrl_close(mMonitor);
wpa_ctrl_close(mCtrl);
mCtrl = mMonitor = NULL;
return -1;
}
mListener = new SupplicantListener(this, mMonitor);
if (mListener->startListener()) {
LOGE("Error - unable to start supplicant listener");
stop();
return -1;
}
return 0;
}
int Supplicant::sendCommand(const char *cmd, char *reply, size_t *reply_len)
{
if (!mCtrl) {
errno = ENOTCONN;
return -1;
}
// LOGD("sendCommand(): -> '%s'", cmd);
int rc;
if ((rc = wpa_ctrl_request(mCtrl, cmd, strlen(cmd), reply, reply_len, NULL)) == -2) {
errno = ETIMEDOUT;
return -1;
} else if (rc < 0 || !strncmp(reply, "FAIL", 4)) {
LOGW("sendCommand(): <- '%s'", reply);
errno = EIO;
return -1;
}
if (!strncmp(cmd, "PING", 4) ||
!strncmp(cmd, "SCAN_RESULTS", 12))
reply[*reply_len] = '\0';
// LOGD("sendCommand(): <- '%s'", reply);
return 0;
}
int Supplicant::triggerScan(bool active) {
char reply[255];
size_t len = sizeof(reply);
if (sendCommand((active ? "DRIVER SCAN-ACTIVE" : "DRIVER SCAN-PASSIVE"),
reply, &len)) {
LOGW("triggerScan(%d): Error setting scan mode (%s)", active,
strerror(errno));
return -1;
}
len = sizeof(reply);
if (sendCommand("SCAN", reply, &len)) {
LOGW("triggerScan(%d): Error initiating scan", active);
return -1;
}
return 0;
}
int Supplicant::onConnectedEvent(SupplicantEvent *evt) {
LOGD("onConnectedEvent(%s)", evt->getEvent());
return 0;
}
int Supplicant::onDisconnectedEvent(SupplicantEvent *evt) {
LOGD("onDisconnectedEvent(%s)", evt->getEvent());
return 0;
}
int Supplicant::onTerminatingEvent(SupplicantEvent *evt) {
LOGD("onTerminatingEvent(%s)", evt->getEvent());
return 0;
}
int Supplicant::onPasswordChangedEvent(SupplicantEvent *evt) {
LOGD("onPasswordChangedEvent(%s)", evt->getEvent());
return 0;
}
int Supplicant::onEapNotificationEvent(SupplicantEvent *evt) {
LOGD("onEapNotificationEvent(%s)", evt->getEvent());
return 0;
}
int Supplicant::onEapStartedEvent(SupplicantEvent *evt) {
LOGD("onEapStartedEvent(%s)", evt->getEvent());
return 0;
}
int Supplicant::onEapMethodEvent(SupplicantEvent *evt) {
LOGD("onEapMethodEvent(%s)", evt->getEvent());
return 0;
}
int Supplicant::onEapSuccessEvent(SupplicantEvent *evt) {
LOGD("onEapSuccessEvent(%s)", evt->getEvent());
return 0;
}
int Supplicant::onEapFailureEvent(SupplicantEvent *evt) {
LOGD("onEapFailureEvent(%s)", evt->getEvent());
return 0;
}
int Supplicant::onScanResultsEvent(SupplicantEvent *evt) {
if (!strcmp(evt->getEvent(), "Ready")) {
char *reply;
if (!(reply = (char *) malloc(4096))) {
errno = -ENOMEM;
return -1;
}
size_t len = 4096;
if (sendCommand("SCAN_RESULTS", reply, &len)) {
LOGW("onScanResultsEvent(%s): Error getting scan results (%s)",
evt->getEvent(), strerror(errno));
free(reply);
return -1;
}
pthread_mutex_lock(&mLatestScanResultsLock);
if (!mLatestScanResults->empty()) {
ScanResultCollection::iterator i;
for (i = mLatestScanResults->begin();
i !=mLatestScanResults->end(); ++i) {
delete *i;
}
mLatestScanResults->clear();
}
char *linep;
char *linep_next = NULL;
if (!strtok_r(reply, "\n", &linep_next)) {
free(reply);
pthread_mutex_unlock(&mLatestScanResultsLock);
return 0;
}
while((linep = strtok_r(NULL, "\n", &linep_next)))
mLatestScanResults->push_back(new ScanResult(linep));
char tmp[128];
sprintf(tmp, "%d scan results ready", mLatestScanResults->size());
NetworkManager::Instance()->getBroadcaster()->
sendBroadcast(ErrorCode::UnsolicitedInformational, tmp, false);
pthread_mutex_unlock(&mLatestScanResultsLock);
free(reply);
} else {
LOGW("Unknown SCAN_RESULTS event (%s)", evt->getEvent());
}
return 0;
}
int Supplicant::onStateChangeEvent(SupplicantEvent *evt) {
char *bword, *last;
char *tmp = strdup(evt->getEvent());
if (!(bword = strtok_r(tmp, " ", &last))) {
LOGE("Malformatted state update (%s)", evt->getEvent());
free(tmp);
return 0;
}
if (!(bword = strtok_r(NULL, " ", &last))) {
LOGE("Malformatted state update (%s)", evt->getEvent());
free(tmp);
return 0;
}
mState = atoi(&bword[strlen("state=")]);
LOGD("State changed to %d", mState);
free(tmp);
return 0;
}
int Supplicant::onLinkSpeedEvent(SupplicantEvent *evt) {
LOGD("onLinkSpeedEvent(%s)", evt->getEvent());
return 0;
}
int Supplicant::onDriverStateEvent(SupplicantEvent *evt) {
LOGD("onDriverStateEvent(%s)", evt->getEvent());
return 0;
}
// XXX: Use a cursor + smartptr instead
ScanResultCollection *Supplicant::createLatestScanResults() {
ScanResultCollection *d = new ScanResultCollection();
ScanResultCollection::iterator i;
pthread_mutex_lock(&mLatestScanResultsLock);
for (i = mLatestScanResults->begin(); i != mLatestScanResults->end(); ++i) {
d->push_back((*i)->clone());
}
pthread_mutex_unlock(&mLatestScanResultsLock);
return d;
}
int Supplicant::setupConfig() {
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;
}