SoftapController.cpp revision 4a0ab5ff4a87cfc4a987da99546b01e44875a2e5 
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 <utils/file.h>
41#include <utils/stringprintf.h>
42#include "wifi.h"
43#include "ResponseCode.h"
44
45#include "SoftapController.h"
46
47static const char HOSTAPD_CONF_FILE[]    = "/data/misc/wifi/hostapd.conf";
48static const char HOSTAPD_BIN_FILE[]    = "/system/bin/hostapd";
49
50SoftapController::SoftapController()
51    : mPid(0) {}
52
53SoftapController::~SoftapController() {
54}
55
56int SoftapController::startSoftap() {
57    pid_t pid = 1;
58
59    if (mPid) {
60        ALOGE("SoftAP is already running");
61        return ResponseCode::SoftapStatusResult;
62    }
63
64    if (ensure_entropy_file_exists() < 0) {
65        ALOGE("Wi-Fi entropy file was not created");
66    }
67
68    if ((pid = fork()) < 0) {
69        ALOGE("fork failed (%s)", strerror(errno));
70        return ResponseCode::ServiceStartFailed;
71    }
72
73    if (!pid) {
74        ensure_entropy_file_exists();
75        if (execl(HOSTAPD_BIN_FILE, HOSTAPD_BIN_FILE,
76                  "-e", WIFI_ENTROPY_FILE,
77                  HOSTAPD_CONF_FILE, (char *) NULL)) {
78            ALOGE("execl failed (%s)", strerror(errno));
79        }
80        ALOGE("SoftAP failed to start");
81        return ResponseCode::ServiceStartFailed;
82    } else {
83        mPid = pid;
84        ALOGD("SoftAP started successfully");
85        usleep(AP_BSS_START_DELAY);
86    }
87    return ResponseCode::SoftapStatusResult;
88}
89
90int SoftapController::stopSoftap() {
91
92    if (mPid == 0) {
93        ALOGE("SoftAP is not running");
94        return ResponseCode::SoftapStatusResult;
95    }
96
97    ALOGD("Stopping the SoftAP service...");
98    kill(mPid, SIGTERM);
99    waitpid(mPid, NULL, 0);
100
101    mPid = 0;
102    ALOGD("SoftAP stopped successfully");
103    usleep(AP_BSS_STOP_DELAY);
104    return ResponseCode::SoftapStatusResult;
105}
106
107bool SoftapController::isSoftapStarted() {
108    return (mPid != 0);
109}
110
111/*
112 * Arguments:
113 *  argv[2] - wlan interface
114 *  argv[3] - SSID
115 *  argv[4] - Broadcast/Hidden
116 *  argv[5] - Channel
117 *  argv[6] - Security
118 *  argv[7] - Key
119 */
120int SoftapController::setSoftap(int argc, char *argv[]) {
121    int hidden = 0;
122    int channel = AP_CHANNEL_DEFAULT;
123
124    if (argc < 5) {
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;
128    }
129
130    if (!strcasecmp(argv[4], "hidden"))
131        hidden = 1;
132
133    if (argc >= 5) {
134        channel = atoi(argv[5]);
135        if (channel <= 0)
136            channel = AP_CHANNEL_DEFAULT;
137    }
138
139    std::string wbuf(android::StringPrintf("interface=%s\n"
140            "driver=nl80211\n"
141            "ctrl_interface=/data/misc/wifi/hostapd\n"
142            "ssid=%s\n"
143            "channel=%d\n"
144            "ieee80211n=1\n"
145            "hw_mode=g\n"
146            "ignore_broadcast_ssid=%d\n"
147            "wowlan_triggers=any\n",
148            argv[2], argv[3], channel, hidden));
149
150    std::string fbuf;
151    if (argc > 7) {
152        char psk_str[2*SHA256_DIGEST_LENGTH+1];
153        if (!strcmp(argv[6], "wpa-psk")) {
154            generatePsk(argv[3], argv[7], psk_str);
155            fbuf = android::StringPrintf("%swpa=3\nwpa_pairwise=TKIP CCMP\nwpa_psk=%s\n", wbuf.c_str(), psk_str);
156        } else if (!strcmp(argv[6], "wpa2-psk")) {
157            generatePsk(argv[3], argv[7], psk_str);
158            fbuf = android::StringPrintf("%swpa=2\nrsn_pairwise=CCMP\nwpa_psk=%s\n", wbuf.c_str(), psk_str);
159        } else if (!strcmp(argv[6], "open")) {
160            fbuf = wbuf;
161        }
162    } else if (argc > 6) {
163        if (!strcmp(argv[6], "open")) {
164            fbuf = wbuf;
165        }
166    } else {
167        fbuf = wbuf;
168    }
169
170    if (!android::WriteStringToFile(fbuf, HOSTAPD_CONF_FILE, 0660, AID_SYSTEM, AID_WIFI)) {
171        ALOGE("Cannot write to \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
172        return ResponseCode::OperationFailed;
173    }
174    return ResponseCode::SoftapStatusResult;
175}
176
177/*
178 * Arguments:
179 *	argv[2] - interface name
180 *	argv[3] - AP or P2P or STA
181 */
182int SoftapController::fwReloadSoftap(int argc, char *argv[])
183{
184    char *fwpath = NULL;
185
186    if (argc < 4) {
187        ALOGE("SoftAP fwreload is missing arguments. Please use: softap <wlan iface> <AP|P2P|STA>");
188        return ResponseCode::CommandSyntaxError;
189    }
190
191    if (strcmp(argv[3], "AP") == 0) {
192        fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_AP);
193    } else if (strcmp(argv[3], "P2P") == 0) {
194        fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_P2P);
195    } else if (strcmp(argv[3], "STA") == 0) {
196        fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_STA);
197    }
198    if (!fwpath)
199        return ResponseCode::CommandParameterError;
200    if (wifi_change_fw_path((const char *)fwpath)) {
201        ALOGE("Softap fwReload failed");
202        return ResponseCode::OperationFailed;
203    }
204    else {
205        ALOGD("Softap fwReload - Ok");
206    }
207    return ResponseCode::SoftapStatusResult;
208}
209
210void SoftapController::generatePsk(char *ssid, char *passphrase, char *psk_str) {
211    unsigned char psk[SHA256_DIGEST_LENGTH];
212    int j;
213    // Use the PKCS#5 PBKDF2 with 4096 iterations
214    PKCS5_PBKDF2_HMAC_SHA1(passphrase, strlen(passphrase),
215            reinterpret_cast<const unsigned char *>(ssid), strlen(ssid),
216            4096, SHA256_DIGEST_LENGTH, psk);
217    for (j=0; j < SHA256_DIGEST_LENGTH; j++) {
218        sprintf(&psk_str[j*2], "%02x", psk[j]);
219    }
220}
221