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 ((pid = fork()) < 0) {
63 ALOGE("fork failed (%s)", strerror(errno));
64 return ResponseCode::ServiceStartFailed;
65 }
66
67 if (!pid) {
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));
73 }
74 ALOGE("SoftAP failed to start");
75 return ResponseCode::ServiceStartFailed;
76 } else {
77 mPid = pid;
78 ALOGD("SoftAP started successfully");
79 usleep(AP_BSS_START_DELAY);
80 }
81 return ResponseCode::SoftapStatusResult;
82 }
83
stopSoftap()84 int SoftapController::stopSoftap() {
85
86 if (mPid == 0) {
87 ALOGE("SoftAP is not running");
88 return ResponseCode::SoftapStatusResult;
89 }
90
91 ALOGD("Stopping the SoftAP service...");
92 kill(mPid, SIGTERM);
93 waitpid(mPid, NULL, 0);
94
95 mPid = 0;
96 ALOGD("SoftAP stopped successfully");
97 usleep(AP_BSS_STOP_DELAY);
98 return ResponseCode::SoftapStatusResult;
99 }
100
isSoftapStarted()101 bool SoftapController::isSoftapStarted() {
102 return (mPid != 0);
103 }
104
105 /*
106 * Arguments:
107 * argv[2] - wlan interface
108 * argv[3] - SSID
109 * argv[4] - Broadcast/Hidden
110 * argv[5] - Channel
111 * argv[6] - Security
112 * argv[7] - Key
113 */
setSoftap(int argc,char * argv[])114 int SoftapController::setSoftap(int argc, char *argv[]) {
115 char psk_str[2*SHA256_DIGEST_LENGTH+1];
116 int ret = ResponseCode::SoftapStatusResult;
117 int fd;
118 int hidden = 0;
119 int channel = AP_CHANNEL_DEFAULT;
120 char *wbuf = NULL;
121 char *fbuf = NULL;
122
123 if (argc < 5) {
124 ALOGE("Softap set is missing arguments. Please use:");
125 ALOGE("softap <wlan iface> <SSID> <hidden/broadcast> <channel> <wpa2?-psk|open> <passphrase>");
126 return ResponseCode::CommandSyntaxError;
127 }
128
129 if (!strcasecmp(argv[4], "hidden"))
130 hidden = 1;
131
132 if (argc >= 5) {
133 channel = atoi(argv[5]);
134 if (channel <= 0)
135 channel = AP_CHANNEL_DEFAULT;
136 }
137
138 asprintf(&wbuf, "interface=%s\ndriver=nl80211\nctrl_interface="
139 "/data/misc/wifi/hostapd\nssid=%s\nchannel=%d\nieee80211n=1\n"
140 "hw_mode=g\nignore_broadcast_ssid=%d\nwowlan_triggers=any\n",
141 argv[2], argv[3], channel, hidden);
142
143 if (argc > 7) {
144 if (!strcmp(argv[6], "wpa-psk")) {
145 generatePsk(argv[3], argv[7], psk_str);
146 asprintf(&fbuf, "%swpa=3\nwpa_pairwise=TKIP CCMP\nwpa_psk=%s\n", wbuf, psk_str);
147 } else if (!strcmp(argv[6], "wpa2-psk")) {
148 generatePsk(argv[3], argv[7], psk_str);
149 asprintf(&fbuf, "%swpa=2\nrsn_pairwise=CCMP\nwpa_psk=%s\n", wbuf, psk_str);
150 } else if (!strcmp(argv[6], "open")) {
151 asprintf(&fbuf, "%s", wbuf);
152 }
153 } else if (argc > 6) {
154 if (!strcmp(argv[6], "open")) {
155 asprintf(&fbuf, "%s", wbuf);
156 }
157 } else {
158 asprintf(&fbuf, "%s", wbuf);
159 }
160
161 fd = open(HOSTAPD_CONF_FILE, O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW, 0660);
162 if (fd < 0) {
163 ALOGE("Cannot update \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
164 free(wbuf);
165 free(fbuf);
166 return ResponseCode::OperationFailed;
167 }
168 if (write(fd, fbuf, strlen(fbuf)) < 0) {
169 ALOGE("Cannot write to \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
170 ret = ResponseCode::OperationFailed;
171 }
172 free(wbuf);
173 free(fbuf);
174
175 /* Note: apparently open can fail to set permissions correctly at times */
176 if (fchmod(fd, 0660) < 0) {
177 ALOGE("Error changing permissions of %s to 0660: %s",
178 HOSTAPD_CONF_FILE, strerror(errno));
179 close(fd);
180 unlink(HOSTAPD_CONF_FILE);
181 return ResponseCode::OperationFailed;
182 }
183
184 if (fchown(fd, AID_SYSTEM, AID_WIFI) < 0) {
185 ALOGE("Error changing group ownership of %s to %d: %s",
186 HOSTAPD_CONF_FILE, AID_WIFI, strerror(errno));
187 close(fd);
188 unlink(HOSTAPD_CONF_FILE);
189 return ResponseCode::OperationFailed;
190 }
191
192 close(fd);
193 return ret;
194 }
195
196 /*
197 * Arguments:
198 * argv[2] - interface name
199 * argv[3] - AP or P2P or STA
200 */
fwReloadSoftap(int argc,char * argv[])201 int SoftapController::fwReloadSoftap(int argc, char *argv[])
202 {
203 char *fwpath = NULL;
204
205 if (argc < 4) {
206 ALOGE("SoftAP fwreload is missing arguments. Please use: softap <wlan iface> <AP|P2P|STA>");
207 return ResponseCode::CommandSyntaxError;
208 }
209
210 if (strcmp(argv[3], "AP") == 0) {
211 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_AP);
212 } else if (strcmp(argv[3], "P2P") == 0) {
213 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_P2P);
214 } else if (strcmp(argv[3], "STA") == 0) {
215 fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_STA);
216 }
217 if (!fwpath)
218 return ResponseCode::CommandParameterError;
219 if (wifi_change_fw_path((const char *)fwpath)) {
220 ALOGE("Softap fwReload failed");
221 return ResponseCode::OperationFailed;
222 }
223 else {
224 ALOGD("Softap fwReload - Ok");
225 }
226 return ResponseCode::SoftapStatusResult;
227 }
228
generatePsk(char * ssid,char * passphrase,char * psk_str)229 void SoftapController::generatePsk(char *ssid, char *passphrase, char *psk_str) {
230 unsigned char psk[SHA256_DIGEST_LENGTH];
231 int j;
232 // Use the PKCS#5 PBKDF2 with 4096 iterations
233 PKCS5_PBKDF2_HMAC_SHA1(passphrase, strlen(passphrase),
234 reinterpret_cast<const unsigned char *>(ssid), strlen(ssid),
235 4096, SHA256_DIGEST_LENGTH, psk);
236 for (j=0; j < SHA256_DIGEST_LENGTH; j++) {
237 sprintf(&psk_str[j*2], "%02x", psk[j]);
238 }
239 }
240