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 <cutils/log.h>
38 #include <netutils/ifc.h>
39 #include <private/android_filesystem_config.h>
40 #include "wifi.h"
41 #include "ResponseCode.h"
42
43 #include "SoftapController.h"
44
45 static const char HOSTAPD_CONF_FILE[] = "/data/misc/wifi/hostapd.conf";
46 static const char HOSTAPD_BIN_FILE[] = "/system/bin/hostapd";
47
SoftapController()48 SoftapController::SoftapController()
49 : mPid(0) {}
50
~SoftapController()51 SoftapController::~SoftapController() {
52 }
53
startSoftap()54 int SoftapController::startSoftap() {
55 pid_t pid = 1;
56
57 if (mPid) {
58 ALOGE("SoftAP is already running");
59 return ResponseCode::SoftapStatusResult;
60 }
61
62 if (ensure_entropy_file_exists() < 0) {
63 ALOGE("Wi-Fi entropy file was not created");
64 }
65
66 if ((pid = fork()) < 0) {
67 ALOGE("fork failed (%s)", strerror(errno));
68 return ResponseCode::ServiceStartFailed;
69 }
70
71 if (!pid) {
72 ensure_entropy_file_exists();
73 if (execl(HOSTAPD_BIN_FILE, HOSTAPD_BIN_FILE,
74 "-e", WIFI_ENTROPY_FILE,
75 HOSTAPD_CONF_FILE, (char *) NULL)) {
76 ALOGE("execl failed (%s)", strerror(errno));
77 }
78 ALOGE("SoftAP failed to start");
79 return ResponseCode::ServiceStartFailed;
80 } else {
81 mPid = pid;
82 ALOGD("SoftAP started successfully");
83 usleep(AP_BSS_START_DELAY);
84 }
85 return ResponseCode::SoftapStatusResult;
86 }
87
stopSoftap()88 int SoftapController::stopSoftap() {
89
90 if (mPid == 0) {
91 ALOGE("SoftAP is not running");
92 return ResponseCode::SoftapStatusResult;
93 }
94
95 ALOGD("Stopping the SoftAP service...");
96 kill(mPid, SIGTERM);
97 waitpid(mPid, NULL, 0);
98
99 mPid = 0;
100 ALOGD("SoftAP stopped successfully");
101 usleep(AP_BSS_STOP_DELAY);
102 return ResponseCode::SoftapStatusResult;
103 }
104
isSoftapStarted()105 bool SoftapController::isSoftapStarted() {
106 return (mPid != 0);
107 }
108
109 /*
110 * Arguments:
111 * argv[2] - wlan interface
112 * argv[3] - SSID
113 * argv[4] - Broadcast/Hidden
114 * argv[5] - Channel
115 * argv[6] - Security
116 * argv[7] - Key
117 */
setSoftap(int argc,char * argv[])118 int SoftapController::setSoftap(int argc, char *argv[]) {
119 char psk_str[2*SHA256_DIGEST_LENGTH+1];
120 int ret = ResponseCode::SoftapStatusResult;
121 int fd;
122 int hidden = 0;
123 int channel = AP_CHANNEL_DEFAULT;
124 char *wbuf = NULL;
125 char *fbuf = NULL;
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 asprintf(&wbuf, "interface=%s\ndriver=nl80211\nctrl_interface="
143 "/data/misc/wifi/hostapd\nssid=%s\nchannel=%d\nieee80211n=1\n"
144 "hw_mode=g\nignore_broadcast_ssid=%d\nwowlan_triggers=any\n",
145 argv[2], argv[3], channel, hidden);
146
147 if (argc > 7) {
148 if (!strcmp(argv[6], "wpa-psk")) {
149 generatePsk(argv[3], argv[7], psk_str);
150 asprintf(&fbuf, "%swpa=3\nwpa_pairwise=TKIP CCMP\nwpa_psk=%s\n", wbuf, psk_str);
151 } else if (!strcmp(argv[6], "wpa2-psk")) {
152 generatePsk(argv[3], argv[7], psk_str);
153 asprintf(&fbuf, "%swpa=2\nrsn_pairwise=CCMP\nwpa_psk=%s\n", wbuf, psk_str);
154 } else if (!strcmp(argv[6], "open")) {
155 asprintf(&fbuf, "%s", wbuf);
156 }
157 } else if (argc > 6) {
158 if (!strcmp(argv[6], "open")) {
159 asprintf(&fbuf, "%s", wbuf);
160 }
161 } else {
162 asprintf(&fbuf, "%s", wbuf);
163 }
164
165 fd = open(HOSTAPD_CONF_FILE, O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW, 0660);
166 if (fd < 0) {
167 ALOGE("Cannot update \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
168 free(wbuf);
169 free(fbuf);
170 return ResponseCode::OperationFailed;
171 }
172 if (write(fd, fbuf, strlen(fbuf)) < 0) {
173 ALOGE("Cannot write to \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
174 ret = ResponseCode::OperationFailed;
175 }
176 free(wbuf);
177 free(fbuf);
178
179 /* Note: apparently open can fail to set permissions correctly at times */
180 if (fchmod(fd, 0660) < 0) {
181 ALOGE("Error changing permissions of %s to 0660: %s",
182 HOSTAPD_CONF_FILE, strerror(errno));
183 close(fd);
184 unlink(HOSTAPD_CONF_FILE);
185 return ResponseCode::OperationFailed;
186 }
187
188 if (fchown(fd, AID_SYSTEM, AID_WIFI) < 0) {
189 ALOGE("Error changing group ownership of %s to %d: %s",
190 HOSTAPD_CONF_FILE, AID_WIFI, strerror(errno));
191 close(fd);
192 unlink(HOSTAPD_CONF_FILE);
193 return ResponseCode::OperationFailed;
194 }
195
196 close(fd);
197 return ret;
198 }
199
200 /*
201 * Arguments:
202 * argv[2] - interface name
203 * argv[3] - AP or P2P or STA
204 */
fwReloadSoftap(int argc,char * argv[])205 int SoftapController::fwReloadSoftap(int argc, char *argv[])
206 {
207 char *fwpath = NULL;
208
209 if (argc < 4) {
210 ALOGE("SoftAP fwreload is missing arguments. Please use: softap <wlan iface> <AP|P2P|STA>");
211 return ResponseCode::CommandSyntaxError;
212 }
213
214 if (strcmp(argv[3], "AP") == 0) {
215 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_AP);
216 } else if (strcmp(argv[3], "P2P") == 0) {
217 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_P2P);
218 } else if (strcmp(argv[3], "STA") == 0) {
219 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_STA);
220 }
221 if (!fwpath)
222 return ResponseCode::CommandParameterError;
223 if (wifi_change_fw_path((const char *)fwpath)) {
224 ALOGE("Softap fwReload failed");
225 return ResponseCode::OperationFailed;
226 }
227 else {
228 ALOGD("Softap fwReload - Ok");
229 }
230 return ResponseCode::SoftapStatusResult;
231 }
232
generatePsk(char * ssid,char * passphrase,char * psk_str)233 void SoftapController::generatePsk(char *ssid, char *passphrase, char *psk_str) {
234 unsigned char psk[SHA256_DIGEST_LENGTH];
235 int j;
236 // Use the PKCS#5 PBKDF2 with 4096 iterations
237 PKCS5_PBKDF2_HMAC_SHA1(passphrase, strlen(passphrase),
238 reinterpret_cast<const unsigned char *>(ssid), strlen(ssid),
239 4096, SHA256_DIGEST_LENGTH, psk);
240 for (j=0; j < SHA256_DIGEST_LENGTH; j++) {
241 sprintf(&psk_str[j*2], "%02x", psk[j]);
242 }
243 }
244