2 * Copyright (C) 2008 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
22 #include <sys/socket.h>
24 #include <sys/ioctl.h>
25 #include <sys/types.h>
28 #include <netinet/in.h>
29 #include <arpa/inet.h>
31 #include <linux/wireless.h>
33 #include <openssl/evp.h>
34 #include <openssl/sha.h>
36 #define LOG_TAG "SoftapController"
37 #include <cutils/log.h>
38 #include <netutils/ifc.h>
39 #include <private/android_filesystem_config.h>
41 #include "ResponseCode.h"
43 #include "SoftapController.h"
45 static const char HOSTAPD_CONF_FILE[] = "/data/misc/wifi/hostapd.conf";
46 static const char HOSTAPD_BIN_FILE[] = "/system/bin/hostapd";
48 SoftapController::SoftapController()
51 SoftapController::~SoftapController() {
54 int SoftapController::startSoftap() {
58 ALOGE("SoftAP is already running");
59 return ResponseCode::SoftapStatusResult;
62 if ((pid = fork()) < 0) {
63 ALOGE("fork failed (%s)", strerror(errno));
64 return ResponseCode::ServiceStartFailed;
68 ensure_entropy_file_exists();
69 if (execl(HOSTAPD_BIN_FILE, HOSTAPD_BIN_FILE,
70 "-e", WIFI_ENTROPY_FILE,
71 HOSTAPD_CONF_FILE, (char *) NULL)) {
72 ALOGE("execl failed (%s)", strerror(errno));
74 ALOGE("SoftAP failed to start");
75 return ResponseCode::ServiceStartFailed;
78 ALOGD("SoftAP started successfully");
79 usleep(AP_BSS_START_DELAY);
81 return ResponseCode::SoftapStatusResult;
84 int SoftapController::stopSoftap() {
87 ALOGE("SoftAP is not running");
88 return ResponseCode::SoftapStatusResult;
91 ALOGD("Stopping the SoftAP service...");
93 waitpid(mPid, NULL, 0);
96 ALOGD("SoftAP stopped successfully");
97 usleep(AP_BSS_STOP_DELAY);
98 return ResponseCode::SoftapStatusResult;
101 bool SoftapController::isSoftapStarted() {
107 * argv[2] - wlan interface
109 * argv[4] - Broadcast/Hidden
114 int SoftapController::setSoftap(int argc, char *argv[]) {
115 char psk_str[2*SHA256_DIGEST_LENGTH+1];
116 int ret = ResponseCode::SoftapStatusResult;
120 int channel = AP_CHANNEL_DEFAULT;
125 ALOGE("Softap set is missing arguments. Please use:");
126 ALOGE("softap <wlan iface> <SSID> <hidden/broadcast> <channel> <wpa2?-psk|open> <passphrase>");
127 return ResponseCode::CommandSyntaxError;
130 if (!strcasecmp(argv[4], "hidden"))
134 channel = atoi(argv[5]);
136 channel = AP_CHANNEL_DEFAULT;
139 asprintf(&wbuf, "interface=%s\ndriver=nl80211\nctrl_interface="
140 "/data/misc/wifi/hostapd\nssid=%s\nchannel=%d\nieee80211n=1\n"
141 "hw_mode=g\nignore_broadcast_ssid=%d\n",
142 argv[2], argv[3], channel, hidden);
145 if (!strcmp(argv[6], "wpa-psk")) {
146 generatePsk(argv[3], argv[7], psk_str);
147 asprintf(&fbuf, "%swpa=1\nwpa_pairwise=TKIP CCMP\nwpa_psk=%s\n", wbuf, psk_str);
148 } else if (!strcmp(argv[6], "wpa2-psk")) {
149 generatePsk(argv[3], argv[7], psk_str);
150 asprintf(&fbuf, "%swpa=2\nrsn_pairwise=CCMP\nwpa_psk=%s\n", wbuf, psk_str);
151 } else if (!strcmp(argv[6], "open")) {
152 asprintf(&fbuf, "%s", wbuf);
154 } else if (argc > 6) {
155 if (!strcmp(argv[6], "open")) {
156 asprintf(&fbuf, "%s", wbuf);
159 asprintf(&fbuf, "%s", wbuf);
162 fd = open(HOSTAPD_CONF_FILE, O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW, 0660);
164 ALOGE("Cannot update \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
167 return ResponseCode::OperationFailed;
169 if (write(fd, fbuf, strlen(fbuf)) < 0) {
170 ALOGE("Cannot write to \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
171 ret = ResponseCode::OperationFailed;
176 /* Note: apparently open can fail to set permissions correctly at times */
177 if (fchmod(fd, 0660) < 0) {
178 ALOGE("Error changing permissions of %s to 0660: %s",
179 HOSTAPD_CONF_FILE, strerror(errno));
181 unlink(HOSTAPD_CONF_FILE);
182 return ResponseCode::OperationFailed;
185 if (fchown(fd, AID_SYSTEM, AID_WIFI) < 0) {
186 ALOGE("Error changing group ownership of %s to %d: %s",
187 HOSTAPD_CONF_FILE, AID_WIFI, strerror(errno));
189 unlink(HOSTAPD_CONF_FILE);
190 return ResponseCode::OperationFailed;
199 * argv[2] - interface name
200 * argv[3] - AP or P2P or STA
202 int SoftapController::fwReloadSoftap(int argc, char *argv[])
208 ALOGE("SoftAP fwreload is missing arguments. Please use: softap <wlan iface> <AP|P2P|STA>");
209 return ResponseCode::CommandSyntaxError;
212 if (strcmp(argv[3], "AP") == 0) {
213 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_AP);
214 } else if (strcmp(argv[3], "P2P") == 0) {
215 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_P2P);
216 } else if (strcmp(argv[3], "STA") == 0) {
217 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_STA);
220 return ResponseCode::CommandParameterError;
221 if (wifi_change_fw_path((const char *)fwpath)) {
222 ALOGE("Softap fwReload failed");
223 return ResponseCode::OperationFailed;
226 ALOGD("Softap fwReload - Ok");
228 return ResponseCode::SoftapStatusResult;
231 void SoftapController::generatePsk(char *ssid, char *passphrase, char *psk_str) {
232 unsigned char psk[SHA256_DIGEST_LENGTH];
234 // Use the PKCS#5 PBKDF2 with 4096 iterations
235 PKCS5_PBKDF2_HMAC_SHA1(passphrase, strlen(passphrase),
236 reinterpret_cast<const unsigned char *>(ssid), strlen(ssid),
237 4096, SHA256_DIGEST_LENGTH, psk);
238 for (j=0; j < SHA256_DIGEST_LENGTH; j++) {
239 sprintf(&psk_str[j*2], "%02x", psk[j]);