/*
* 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 <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/wireless.h>
#include <openssl/evp.h>
#include <openssl/sha.h>
#define LOG_TAG "SoftapController"
#include <android-base/file.h>
#include <android-base/stringprintf.h>
#include <cutils/log.h>
#include <netutils/ifc.h>
#include <private/android_filesystem_config.h>
#include "wifi.h"
#include "ResponseCode.h"
#include "SoftapController.h"
using android::base::StringPrintf;
using android::base::WriteStringToFile;
static const char HOSTAPD_CONF_FILE[] = "/data/misc/wifi/hostapd.conf";
static const char HOSTAPD_BIN_FILE[] = "/system/bin/hostapd";
SoftapController::SoftapController()
: mPid(0) {}
SoftapController::~SoftapController() {
}
int SoftapController::startSoftap() {
pid_t pid = 1;
if (mPid) {
ALOGE("SoftAP is already running");
return ResponseCode::SoftapStatusResult;
}
if (ensure_entropy_file_exists() < 0) {
ALOGE("Wi-Fi entropy file was not created");
}
if ((pid = fork()) < 0) {
ALOGE("fork failed (%s)", strerror(errno));
return ResponseCode::ServiceStartFailed;
}
if (!pid) {
ensure_entropy_file_exists();
if (execl(HOSTAPD_BIN_FILE, HOSTAPD_BIN_FILE,
"-e", WIFI_ENTROPY_FILE,
HOSTAPD_CONF_FILE, (char *) NULL)) {
ALOGE("execl failed (%s)", strerror(errno));
}
ALOGE("SoftAP failed to start");
return ResponseCode::ServiceStartFailed;
} else {
mPid = pid;
ALOGD("SoftAP started successfully");
usleep(AP_BSS_START_DELAY);
}
return ResponseCode::SoftapStatusResult;
}
int SoftapController::stopSoftap() {
if (mPid == 0) {
ALOGE("SoftAP is not running");
return ResponseCode::SoftapStatusResult;
}
ALOGD("Stopping the SoftAP service...");
kill(mPid, SIGTERM);
waitpid(mPid, NULL, 0);
mPid = 0;
ALOGD("SoftAP stopped successfully");
usleep(AP_BSS_STOP_DELAY);
return ResponseCode::SoftapStatusResult;
}
bool SoftapController::isSoftapStarted() {
return (mPid != 0);
}
/*
* Arguments:
* argv[2] - wlan interface
* argv[3] - SSID
* argv[4] - Broadcast/Hidden
* argv[5] - Channel
* argv[6] - Security
* argv[7] - Key
*/
int SoftapController::setSoftap(int argc, char *argv[]) {
int hidden = 0;
int channel = AP_CHANNEL_DEFAULT;
if (argc < 5) {
ALOGE("Softap set is missing arguments. Please use:");
ALOGE("softap <wlan iface> <SSID> <hidden/broadcast> <channel> <wpa2?-psk|open> <passphrase>");
return ResponseCode::CommandSyntaxError;
}
if (!strcasecmp(argv[4], "hidden"))
hidden = 1;
if (argc >= 5) {
channel = atoi(argv[5]);
if (channel <= 0)
channel = AP_CHANNEL_DEFAULT;
}
std::string wbuf(StringPrintf("interface=%s\n"
"driver=nl80211\n"
"ctrl_interface=/data/misc/wifi/hostapd\n"
"ssid=%s\n"
"channel=%d\n"
"ieee80211n=1\n"
"hw_mode=%c\n"
"ignore_broadcast_ssid=%d\n"
"wowlan_triggers=any\n",
argv[2], argv[3], channel, (channel <= 14) ? 'g' : 'a', hidden));
std::string fbuf;
if (argc > 7) {
char psk_str[2*SHA256_DIGEST_LENGTH+1];
if (!strcmp(argv[6], "wpa-psk")) {
if (!generatePsk(argv[3], argv[7], psk_str)) {
return ResponseCode::OperationFailed;
}
fbuf = StringPrintf("%swpa=3\nwpa_pairwise=TKIP CCMP\nwpa_psk=%s\n", wbuf.c_str(), psk_str);
} else if (!strcmp(argv[6], "wpa2-psk")) {
if (!generatePsk(argv[3], argv[7], psk_str)) {
return ResponseCode::OperationFailed;
}
fbuf = StringPrintf("%swpa=2\nrsn_pairwise=CCMP\nwpa_psk=%s\n", wbuf.c_str(), psk_str);
} else if (!strcmp(argv[6], "open")) {
fbuf = wbuf;
}
} else if (argc > 6) {
if (!strcmp(argv[6], "open")) {
fbuf = wbuf;
}
} else {
fbuf = wbuf;
}
if (!WriteStringToFile(fbuf, HOSTAPD_CONF_FILE, 0660, AID_SYSTEM, AID_WIFI)) {
ALOGE("Cannot write to \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
return ResponseCode::OperationFailed;
}
return ResponseCode::SoftapStatusResult;
}
/*
* Arguments:
* argv[2] - interface name
* argv[3] - AP or P2P or STA
*/
int SoftapController::fwReloadSoftap(int argc, char *argv[])
{
char *fwpath = NULL;
if (argc < 4) {
ALOGE("SoftAP fwreload is missing arguments. Please use: softap <wlan iface> <AP|P2P|STA>");
return ResponseCode::CommandSyntaxError;
}
if (strcmp(argv[3], "AP") == 0) {
fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_AP);
} else if (strcmp(argv[3], "P2P") == 0) {
fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_P2P);
} else if (strcmp(argv[3], "STA") == 0) {
fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_STA);
} else {
return ResponseCode::CommandParameterError;
}
if (!fwpath) {
ALOGE("Softap fwReload - NULL path for %s", argv[3]);
return ResponseCode::SoftapStatusResult;
}
if (wifi_change_fw_path((const char *)fwpath)) {
ALOGE("Softap fwReload failed");
return ResponseCode::OperationFailed;
}
else {
ALOGD("Softap fwReload - Ok");
}
return ResponseCode::SoftapStatusResult;
}
bool SoftapController::generatePsk(char *ssid, char *passphrase, char *psk_str) {
unsigned char psk[SHA256_DIGEST_LENGTH];
// Use the PKCS#5 PBKDF2 with 4096 iterations
if (PKCS5_PBKDF2_HMAC_SHA1(passphrase, strlen(passphrase),
reinterpret_cast<const unsigned char *>(ssid),
strlen(ssid), 4096, SHA256_DIGEST_LENGTH,
psk) != 1) {
ALOGE("Cannot generate PSK using PKCS#5 PBKDF2");
return false;
}
for (int j=0; j < SHA256_DIGEST_LENGTH; j++) {
sprintf(&psk_str[j*2], "%02x", psk[j]);
}
return true;
}