SoftapController.cpp revision b67219a71d1d896bcb34c4a7a797824b88515b2c 
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
47using android::base::StringPrintf;
48using android::base::WriteStringToFile;
49
50static const char HOSTAPD_CONF_FILE[]    = "/data/misc/wifi/hostapd.conf";
51static const char HOSTAPD_BIN_FILE[]    = "/system/bin/hostapd";
52
53SoftapController::SoftapController()
54    : mPid(0) {}
55
56SoftapController::~SoftapController() {
57}
58
59int 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
93int 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
110bool 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 */
123int 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=g\n"
149            "ignore_broadcast_ssid=%d\n"
150            "wowlan_triggers=any\n",
151            argv[2], argv[3], channel, 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 */
185int 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
213void 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