1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
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
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17 #include <stdlib.h>
18 #include <errno.h>
19 #include <fcntl.h>
20 #include <string.h>
21
22 #include <sys/socket.h>
23 #include <sys/stat.h>
24 #include <sys/ioctl.h>
25 #include <sys/types.h>
26 #include <sys/wait.h>
27
28 #include <netinet/in.h>
29 #include <arpa/inet.h>
30
31 #include <linux/wireless.h>
32
33 #include <openssl/evp.h>
34 #include <openssl/sha.h>
35
36 #define LOG_TAG "SoftapController"
37 #include <base/file.h>
38 #include <base/stringprintf.h>
39 #include <cutils/log.h>
40 #include <netutils/ifc.h>
41 #include <private/android_filesystem_config.h>
42 #include "wifi.h"
43 #include "ResponseCode.h"
44
45 #include "SoftapController.h"
46
47 using android::base::StringPrintf;
48 using android::base::WriteStringToFile;
49
50 static const char HOSTAPD_CONF_FILE[] = "/data/misc/wifi/hostapd.conf";
51 static const char HOSTAPD_BIN_FILE[] = "/system/bin/hostapd";
52
SoftapController()53 SoftapController::SoftapController()
54 : mPid(0) {}
55
~SoftapController()56 SoftapController::~SoftapController() {
57 }
58
startSoftap()59 int SoftapController::startSoftap() {
60 pid_t pid = 1;
61
62 if (mPid) {
63 ALOGE("SoftAP is already running");
64 return ResponseCode::SoftapStatusResult;
65 }
66
67 if (ensure_entropy_file_exists() < 0) {
68 ALOGE("Wi-Fi entropy file was not created");
69 }
70
71 if ((pid = fork()) < 0) {
72 ALOGE("fork failed (%s)", strerror(errno));
73 return ResponseCode::ServiceStartFailed;
74 }
75
76 if (!pid) {
77 ensure_entropy_file_exists();
78 if (execl(HOSTAPD_BIN_FILE, HOSTAPD_BIN_FILE,
79 "-e", WIFI_ENTROPY_FILE,
80 HOSTAPD_CONF_FILE, (char *) NULL)) {
81 ALOGE("execl failed (%s)", strerror(errno));
82 }
83 ALOGE("SoftAP failed to start");
84 return ResponseCode::ServiceStartFailed;
85 } else {
86 mPid = pid;
87 ALOGD("SoftAP started successfully");
88 usleep(AP_BSS_START_DELAY);
89 }
90 return ResponseCode::SoftapStatusResult;
91 }
92
stopSoftap()93 int SoftapController::stopSoftap() {
94
95 if (mPid == 0) {
96 ALOGE("SoftAP is not running");
97 return ResponseCode::SoftapStatusResult;
98 }
99
100 ALOGD("Stopping the SoftAP service...");
101 kill(mPid, SIGTERM);
102 waitpid(mPid, NULL, 0);
103
104 mPid = 0;
105 ALOGD("SoftAP stopped successfully");
106 usleep(AP_BSS_STOP_DELAY);
107 return ResponseCode::SoftapStatusResult;
108 }
109
isSoftapStarted()110 bool SoftapController::isSoftapStarted() {
111 return (mPid != 0);
112 }
113
114 /*
115 * Arguments:
116 * argv[2] - wlan interface
117 * argv[3] - SSID
118 * argv[4] - Broadcast/Hidden
119 * argv[5] - Channel
120 * argv[6] - Security
121 * argv[7] - Key
122 */
setSoftap(int argc,char * argv[])123 int SoftapController::setSoftap(int argc, char *argv[]) {
124 int hidden = 0;
125 int channel = AP_CHANNEL_DEFAULT;
126
127 if (argc < 5) {
128 ALOGE("Softap set is missing arguments. Please use:");
129 ALOGE("softap <wlan iface> <SSID> <hidden/broadcast> <channel> <wpa2?-psk|open> <passphrase>");
130 return ResponseCode::CommandSyntaxError;
131 }
132
133 if (!strcasecmp(argv[4], "hidden"))
134 hidden = 1;
135
136 if (argc >= 5) {
137 channel = atoi(argv[5]);
138 if (channel <= 0)
139 channel = AP_CHANNEL_DEFAULT;
140 }
141
142 std::string wbuf(StringPrintf("interface=%s\n"
143 "driver=nl80211\n"
144 "ctrl_interface=/data/misc/wifi/hostapd\n"
145 "ssid=%s\n"
146 "channel=%d\n"
147 "ieee80211n=1\n"
148 "hw_mode=%c\n"
149 "ignore_broadcast_ssid=%d\n"
150 "wowlan_triggers=any\n",
151 argv[2], argv[3], channel, (channel <= 14) ? 'g' : 'a', hidden));
152
153 std::string fbuf;
154 if (argc > 7) {
155 char psk_str[2*SHA256_DIGEST_LENGTH+1];
156 if (!strcmp(argv[6], "wpa-psk")) {
157 generatePsk(argv[3], argv[7], psk_str);
158 fbuf = StringPrintf("%swpa=3\nwpa_pairwise=TKIP CCMP\nwpa_psk=%s\n", wbuf.c_str(), psk_str);
159 } else if (!strcmp(argv[6], "wpa2-psk")) {
160 generatePsk(argv[3], argv[7], psk_str);
161 fbuf = StringPrintf("%swpa=2\nrsn_pairwise=CCMP\nwpa_psk=%s\n", wbuf.c_str(), psk_str);
162 } else if (!strcmp(argv[6], "open")) {
163 fbuf = wbuf;
164 }
165 } else if (argc > 6) {
166 if (!strcmp(argv[6], "open")) {
167 fbuf = wbuf;
168 }
169 } else {
170 fbuf = wbuf;
171 }
172
173 if (!WriteStringToFile(fbuf, HOSTAPD_CONF_FILE, 0660, AID_SYSTEM, AID_WIFI)) {
174 ALOGE("Cannot write to \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
175 return ResponseCode::OperationFailed;
176 }
177 return ResponseCode::SoftapStatusResult;
178 }
179
180 /*
181 * Arguments:
182 * argv[2] - interface name
183 * argv[3] - AP or P2P or STA
184 */
fwReloadSoftap(int argc,char * argv[])185 int SoftapController::fwReloadSoftap(int argc, char *argv[])
186 {
187 char *fwpath = NULL;
188
189 if (argc < 4) {
190 ALOGE("SoftAP fwreload is missing arguments. Please use: softap <wlan iface> <AP|P2P|STA>");
191 return ResponseCode::CommandSyntaxError;
192 }
193
194 if (strcmp(argv[3], "AP") == 0) {
195 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_AP);
196 } else if (strcmp(argv[3], "P2P") == 0) {
197 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_P2P);
198 } else if (strcmp(argv[3], "STA") == 0) {
199 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_STA);
200 }
201 if (!fwpath)
202 return ResponseCode::CommandParameterError;
203 if (wifi_change_fw_path((const char *)fwpath)) {
204 ALOGE("Softap fwReload failed");
205 return ResponseCode::OperationFailed;
206 }
207 else {
208 ALOGD("Softap fwReload - Ok");
209 }
210 return ResponseCode::SoftapStatusResult;
211 }
212
generatePsk(char * ssid,char * passphrase,char * psk_str)213 void SoftapController::generatePsk(char *ssid, char *passphrase, char *psk_str) {
214 unsigned char psk[SHA256_DIGEST_LENGTH];
215 int j;
216 // Use the PKCS#5 PBKDF2 with 4096 iterations
217 PKCS5_PBKDF2_HMAC_SHA1(passphrase, strlen(passphrase),
218 reinterpret_cast<const unsigned char *>(ssid), strlen(ssid),
219 4096, SHA256_DIGEST_LENGTH, psk);
220 for (j=0; j < SHA256_DIGEST_LENGTH; j++) {
221 sprintf(&psk_str[j*2], "%02x", psk[j]);
222 }
223 }
224