SoftapController.cpp revision 78dcb76aff7d3b9458374832a79688d36901127f 
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
42#include "SoftapController.h"
43
44static const char HOSTAPD_CONF_FILE[]    = "/data/misc/wifi/hostapd.conf";
45
46SoftapController::SoftapController() {
47    mPid = 0;
48    mSock = socket(AF_INET, SOCK_DGRAM, 0);
49    if (mSock < 0)
50        LOGE("Failed to open socket");
51    memset(mIface, 0, sizeof(mIface));
52}
53
54SoftapController::~SoftapController() {
55    if (mSock >= 0)
56        close(mSock);
57}
58
59int SoftapController::setCommand(char *iface, const char *fname, unsigned buflen) {
60#ifdef HAVE_HOSTAPD
61    return 0;
62#else
63    char tBuf[SOFTAP_MAX_BUFFER_SIZE];
64    struct iwreq wrq;
65    struct iw_priv_args *priv_ptr;
66    int i, j, ret;
67    int cmd = 0, sub_cmd = 0;
68
69    strncpy(wrq.ifr_name, iface, sizeof(wrq.ifr_name));
70    wrq.u.data.pointer = tBuf;
71    wrq.u.data.length = sizeof(tBuf) / sizeof(struct iw_priv_args);
72    wrq.u.data.flags = 0;
73    if ((ret = ioctl(mSock, SIOCGIWPRIV, &wrq)) < 0) {
74        LOGE("SIOCGIPRIV failed: %d", ret);
75        return ret;
76    }
77
78    priv_ptr = (struct iw_priv_args *)wrq.u.data.pointer;
79    for(i=0; i < wrq.u.data.length;i++) {
80        if (strcmp(priv_ptr[i].name, fname) == 0) {
81            cmd = priv_ptr[i].cmd;
82            break;
83        }
84    }
85
86    if (i == wrq.u.data.length) {
87        LOGE("iface:%s, fname: %s - function not supported", iface, fname);
88        return -1;
89    }
90
91    if (cmd < SIOCDEVPRIVATE) {
92        for(j=0; j < i; j++) {
93            if ((priv_ptr[j].set_args == priv_ptr[i].set_args) &&
94                (priv_ptr[j].get_args == priv_ptr[i].get_args) &&
95                (priv_ptr[j].name[0] == '\0'))
96                break;
97        }
98        if (j == i) {
99            LOGE("iface:%s, fname: %s - invalid private ioctl", iface, fname);
100            return -1;
101        }
102        sub_cmd = cmd;
103        cmd = priv_ptr[j].cmd;
104    }
105
106    strncpy(wrq.ifr_name, iface, sizeof(wrq.ifr_name));
107    if ((buflen == 0) && (*mBuf != 0))
108        wrq.u.data.length = strlen(mBuf) + 1;
109    else
110        wrq.u.data.length = buflen;
111    wrq.u.data.pointer = mBuf;
112    wrq.u.data.flags = sub_cmd;
113    ret = ioctl(mSock, cmd, &wrq);
114    return ret;
115#endif
116}
117
118int SoftapController::startDriver(char *iface) {
119    int ret;
120
121    if (mSock < 0) {
122        LOGE("Softap driver start - failed to open socket");
123        return -1;
124    }
125    if (!iface || (iface[0] == '\0')) {
126        LOGD("Softap driver start - wrong interface");
127        iface = mIface;
128    }
129
130    *mBuf = 0;
131    ret = setCommand(iface, "START");
132    if (ret < 0) {
133        LOGE("Softap driver start: %d", ret);
134        return ret;
135    }
136#ifdef HAVE_HOSTAPD
137    ifc_init();
138    ret = ifc_up(iface);
139    ifc_close();
140#endif
141    usleep(AP_DRIVER_START_DELAY);
142    LOGD("Softap driver start: %d", ret);
143    return ret;
144}
145
146int SoftapController::stopDriver(char *iface) {
147    int ret;
148
149    if (mSock < 0) {
150        LOGE("Softap driver stop - failed to open socket");
151        return -1;
152    }
153    if (!iface || (iface[0] == '\0')) {
154        LOGD("Softap driver stop - wrong interface");
155        iface = mIface;
156    }
157    *mBuf = 0;
158#ifdef HAVE_HOSTAPD
159    ifc_init();
160    ret = ifc_down(iface);
161    ifc_close();
162    if (ret < 0) {
163        LOGE("Softap %s down: %d", iface, ret);
164    }
165#endif
166    ret = setCommand(iface, "STOP");
167    LOGD("Softap driver stop: %d", ret);
168    return ret;
169}
170
171int SoftapController::startSoftap() {
172    pid_t pid = 1;
173    int ret = 0;
174
175    if (mPid) {
176        LOGE("Softap already started");
177        return 0;
178    }
179    if (mSock < 0) {
180        LOGE("Softap startap - failed to open socket");
181        return -1;
182    }
183#ifdef HAVE_HOSTAPD
184    if ((pid = fork()) < 0) {
185        LOGE("fork failed (%s)", strerror(errno));
186        return -1;
187    }
188#endif
189    if (!pid) {
190#ifdef HAVE_HOSTAPD
191        if (execl("/system/bin/hostapd", "/system/bin/hostapd",
192                  HOSTAPD_CONF_FILE, (char *) NULL)) {
193           LOGE("execl failed (%s)", strerror(errno));
194        }
195#endif
196        LOGE("Should never get here!");
197        return -1;
198    } else {
199        *mBuf = 0;
200        ret = setCommand(mIface, "AP_BSS_START");
201        if (ret) {
202            LOGE("Softap startap - failed: %d", ret);
203        }
204        else {
205           mPid = pid;
206           LOGD("Softap startap - Ok");
207           usleep(AP_BSS_START_DELAY);
208        }
209    }
210    return ret;
211
212}
213
214int SoftapController::stopSoftap() {
215    int ret;
216
217    if (mPid == 0) {
218        LOGE("Softap already stopped");
219        return 0;
220    }
221
222#ifdef HAVE_HOSTAPD
223    LOGD("Stopping Softap service");
224    kill(mPid, SIGTERM);
225    waitpid(mPid, NULL, 0);
226#endif
227    if (mSock < 0) {
228        LOGE("Softap stopap - failed to open socket");
229        return -1;
230    }
231    *mBuf = 0;
232    ret = setCommand(mIface, "AP_BSS_STOP");
233    mPid = 0;
234    LOGD("Softap service stopped: %d", ret);
235    usleep(AP_BSS_STOP_DELAY);
236    return ret;
237}
238
239bool SoftapController::isSoftapStarted() {
240    return (mPid != 0 ? true : false);
241}
242
243int SoftapController::addParam(int pos, const char *cmd, const char *arg)
244{
245    if (pos < 0)
246        return pos;
247    if ((unsigned)(pos + strlen(cmd) + strlen(arg) + 1) >= sizeof(mBuf)) {
248        LOGE("Command line is too big");
249        return -1;
250    }
251    pos += sprintf(&mBuf[pos], "%s=%s,", cmd, arg);
252    return pos;
253}
254
255/*
256 * Arguments:
257 *      argv[2] - wlan interface
258 *      argv[3] - softap interface
259 *      argv[4] - SSID
260 *	argv[5] - Security
261 *	argv[6] - Key
262 *	argv[7] - Channel
263 *	argv[8] - Preamble
264 *	argv[9] - Max SCB
265 */
266int SoftapController::setSoftap(int argc, char *argv[]) {
267    char psk_str[2*SHA256_DIGEST_LENGTH+1];
268    int ret = 0, i = 0, fd;
269    char *ssid, *iface;
270
271    if (mSock < 0) {
272        LOGE("Softap set - failed to open socket");
273        return -1;
274    }
275    if (argc < 4) {
276        LOGE("Softap set - missing arguments");
277        return -1;
278    }
279
280    strncpy(mIface, argv[3], sizeof(mIface));
281    iface = argv[2];
282
283#ifdef HAVE_HOSTAPD
284    char *wbuf = NULL;
285    char *fbuf = NULL;
286
287    if (argc > 4) {
288        ssid = argv[4];
289    } else {
290        ssid = (char *)"AndroidAP";
291    }
292
293    asprintf(&wbuf, "interface=%s\ndriver=nl80211\nctrl_interface="
294            "/data/misc/wifi/hostapd\nssid=%s\nchannel=6\n", iface, ssid);
295
296    if (argc > 5) {
297        if (!strcmp(argv[5], "wpa-psk")) {
298            generatePsk(ssid, argv[6], psk_str);
299            asprintf(&fbuf, "%swpa=1\nwpa_psk=%s\n", wbuf, psk_str);
300        } else if (!strcmp(argv[5], "wpa2-psk")) {
301            generatePsk(ssid, argv[6], psk_str);
302            asprintf(&fbuf, "%swpa=2\nwpa_psk=%s\n", wbuf, psk_str);
303        } else if (!strcmp(argv[5], "open")) {
304            asprintf(&fbuf, "%s", wbuf);
305        }
306    } else {
307        asprintf(&fbuf, "%s", wbuf);
308    }
309
310    fd = open(HOSTAPD_CONF_FILE, O_CREAT | O_TRUNC | O_WRONLY, 0660);
311    if (fd < 0) {
312        LOGE("Cannot update \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
313        free(wbuf);
314        free(fbuf);
315        return -1;
316    }
317    if (write(fd, fbuf, strlen(fbuf)) < 0) {
318        LOGE("Cannot write to \"%s\": %s", HOSTAPD_CONF_FILE, strerror(errno));
319        ret = -1;
320    }
321    close(fd);
322    free(wbuf);
323    free(fbuf);
324
325    /* Note: apparently open can fail to set permissions correctly at times */
326    if (chmod(HOSTAPD_CONF_FILE, 0660) < 0) {
327        LOGE("Error changing permissions of %s to 0660: %s",
328                HOSTAPD_CONF_FILE, strerror(errno));
329        unlink(HOSTAPD_CONF_FILE);
330        return -1;
331    }
332
333    if (chown(HOSTAPD_CONF_FILE, AID_SYSTEM, AID_WIFI) < 0) {
334        LOGE("Error changing group ownership of %s to %d: %s",
335                HOSTAPD_CONF_FILE, AID_WIFI, strerror(errno));
336        unlink(HOSTAPD_CONF_FILE);
337        return -1;
338    }
339
340#else
341    /* Create command line */
342    i = addParam(i, "ASCII_CMD", "AP_CFG");
343    if (argc > 4) {
344        ssid = argv[4];
345    } else {
346        ssid = (char *)"AndroidAP";
347    }
348    i = addParam(i, "SSID", ssid);
349    if (argc > 5) {
350        i = addParam(i, "SEC", argv[5]);
351    } else {
352        i = addParam(i, "SEC", "open");
353    }
354    if (argc > 6) {
355        generatePsk(ssid, argv[6], psk_str);
356        i = addParam(i, "KEY", psk_str);
357    } else {
358        i = addParam(i, "KEY", "12345678");
359    }
360    if (argc > 7) {
361        i = addParam(i, "CHANNEL", argv[7]);
362    } else {
363        i = addParam(i, "CHANNEL", "6");
364    }
365    if (argc > 8) {
366        i = addParam(i, "PREAMBLE", argv[8]);
367    } else {
368        i = addParam(i, "PREAMBLE", "0");
369    }
370    if (argc > 9) {
371        i = addParam(i, "MAX_SCB", argv[9]);
372    } else {
373        i = addParam(i, "MAX_SCB", "8");
374    }
375    if ((i < 0) || ((unsigned)(i + 4) >= sizeof(mBuf))) {
376        LOGE("Softap set - command is too big");
377        return i;
378    }
379    sprintf(&mBuf[i], "END");
380
381    /* system("iwpriv eth0 WL_AP_CFG ASCII_CMD=AP_CFG,SSID=\"AndroidAP\",SEC=\"open\",KEY=12345,CHANNEL=1,PREAMBLE=0,MAX_SCB=8,END"); */
382    ret = setCommand(iface, "AP_SET_CFG");
383    if (ret) {
384        LOGE("Softap set - failed: %d", ret);
385    }
386    else {
387        LOGD("Softap set - Ok");
388        usleep(AP_SET_CFG_DELAY);
389    }
390#endif
391    return ret;
392}
393
394void SoftapController::generatePsk(char *ssid, char *passphrase, char *psk_str) {
395    unsigned char psk[SHA256_DIGEST_LENGTH];
396    int j;
397    // Use the PKCS#5 PBKDF2 with 4096 iterations
398    PKCS5_PBKDF2_HMAC_SHA1(passphrase, strlen(passphrase),
399            reinterpret_cast<const unsigned char *>(ssid), strlen(ssid),
400            4096, SHA256_DIGEST_LENGTH, psk);
401    for (j=0; j < SHA256_DIGEST_LENGTH; j++) {
402        sprintf(&psk_str[j<<1], "%02x", psk[j]);
403    }
404    psk_str[j<<1] = '\0';
405}
406
407
408/*
409 * Arguments:
410 *	argv[2] - interface name
411 *	argv[3] - AP or STA
412 */
413int SoftapController::fwReloadSoftap(int argc, char *argv[])
414{
415    int ret, i = 0;
416    char *iface;
417    char *fwpath;
418
419    if (mSock < 0) {
420        LOGE("Softap fwrealod - failed to open socket");
421        return -1;
422    }
423    if (argc < 4) {
424        LOGE("Softap fwreload - missing arguments");
425        return -1;
426    }
427
428    iface = argv[2];
429
430    if (strcmp(argv[3], "AP") == 0) {
431        fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_AP);
432    } else {
433        fwpath = (char *)wifi_get_fw_path(WIFI_GET_FW_PATH_STA);
434    }
435    if (!fwpath)
436        return -1;
437#ifdef HAVE_HOSTAPD
438    ret = wifi_change_fw_path((const char *)fwpath);
439#else
440    sprintf(mBuf, "FW_PATH=%s", fwpath);
441    ret = setCommand(iface, "WL_FW_RELOAD");
442#endif
443    if (ret) {
444        LOGE("Softap fwReload - failed: %d", ret);
445    }
446    else {
447        LOGD("Softap fwReload - Ok");
448    }
449    return ret;
450}
451
452int SoftapController::clientsSoftap(char **retbuf)
453{
454    int ret;
455
456    if (mSock < 0) {
457        LOGE("Softap clients - failed to open socket");
458        return -1;
459    }
460    *mBuf = 0;
461    ret = setCommand(mIface, "AP_GET_STA_LIST", SOFTAP_MAX_BUFFER_SIZE);
462    if (ret) {
463        LOGE("Softap clients - failed: %d", ret);
464    } else {
465        asprintf(retbuf, "Softap clients:%s", mBuf);
466        LOGD("Softap clients:%s", mBuf);
467    }
468    return ret;
469}
470