VolumeManager.cpp revision 68f8ebdb24dfe1fe94de2c8fc11084ebfab9fa5d 
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 <stdio.h>
18#include <stdlib.h>
19#include <string.h>
20#include <errno.h>
21#include <fcntl.h>
22#include <sys/stat.h>
23#include <sys/types.h>
24#include <sys/mount.h>
25
26#include <linux/kdev_t.h>
27
28#define LOG_TAG "Vold"
29
30#include <cutils/log.h>
31
32#include <sysutils/NetlinkEvent.h>
33
34#include "VolumeManager.h"
35#include "DirectVolume.h"
36#include "ResponseCode.h"
37#include "Loop.h"
38#include "Fat.h"
39#include "Devmapper.h"
40
41extern "C" void KillProcessesWithOpenFiles(const char *, int, int, int);
42
43VolumeManager *VolumeManager::sInstance = NULL;
44
45VolumeManager *VolumeManager::Instance() {
46    if (!sInstance)
47        sInstance = new VolumeManager();
48    return sInstance;
49}
50
51VolumeManager::VolumeManager() {
52    mBlockDevices = new BlockDeviceCollection();
53    mVolumes = new VolumeCollection();
54    mActiveContainers = new AsecIdCollection();
55    mBroadcaster = NULL;
56    mUsbMassStorageConnected = false;
57}
58
59VolumeManager::~VolumeManager() {
60    delete mBlockDevices;
61    delete mVolumes;
62    delete mActiveContainers;
63}
64
65int VolumeManager::start() {
66    return 0;
67}
68
69int VolumeManager::stop() {
70    return 0;
71}
72
73int VolumeManager::addVolume(Volume *v) {
74    mVolumes->push_back(v);
75    return 0;
76}
77
78void VolumeManager::notifyUmsConnected(bool connected) {
79    char msg[255];
80
81    if (connected) {
82        mUsbMassStorageConnected = true;
83    } else {
84        mUsbMassStorageConnected = false;
85    }
86    snprintf(msg, sizeof(msg), "Share method ums now %s",
87             (connected ? "available" : "unavailable"));
88
89    getBroadcaster()->sendBroadcast(ResponseCode::ShareAvailabilityChange,
90                                    msg, false);
91}
92
93void VolumeManager::handleSwitchEvent(NetlinkEvent *evt) {
94    const char *devpath = evt->findParam("DEVPATH");
95    const char *name = evt->findParam("SWITCH_NAME");
96    const char *state = evt->findParam("SWITCH_STATE");
97
98    if (!name || !state) {
99        LOGW("Switch %s event missing name/state info", devpath);
100        return;
101    }
102
103    if (!strcmp(name, "usb_mass_storage")) {
104
105        if (!strcmp(state, "online"))  {
106            notifyUmsConnected(true);
107        } else {
108            notifyUmsConnected(false);
109        }
110    } else {
111        LOGW("Ignoring unknown switch '%s'", name);
112    }
113}
114
115void VolumeManager::handleBlockEvent(NetlinkEvent *evt) {
116    const char *devpath = evt->findParam("DEVPATH");
117
118    /* Lookup a volume to handle this device */
119    VolumeCollection::iterator it;
120    bool hit = false;
121    for (it = mVolumes->begin(); it != mVolumes->end(); ++it) {
122        if (!(*it)->handleBlockEvent(evt)) {
123#ifdef NETLINK_DEBUG
124            LOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel());
125#endif
126            hit = true;
127            break;
128        }
129    }
130
131    if (!hit) {
132#ifdef NETLINK_DEBUG
133        LOGW("No volumes handled block event for '%s'", devpath);
134#endif
135    }
136}
137
138int VolumeManager::listVolumes(SocketClient *cli) {
139    VolumeCollection::iterator i;
140
141    for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
142        char *buffer;
143        asprintf(&buffer, "%s %s %d",
144                 (*i)->getLabel(), (*i)->getMountpoint(),
145                 (*i)->getState());
146        cli->sendMsg(ResponseCode::VolumeListResult, buffer, false);
147        free(buffer);
148    }
149    cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false);
150    return 0;
151}
152
153int VolumeManager::formatVolume(const char *label) {
154    Volume *v = lookupVolume(label);
155
156    if (!v) {
157        errno = ENOENT;
158        return -1;
159    }
160
161    return v->formatVol();
162}
163
164int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) {
165    char mountPoint[255];
166
167    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
168    snprintf(buffer, maxlen, "/asec/%s", id);
169    return 0;
170}
171
172int VolumeManager::createAsec(const char *id, unsigned int numSectors,
173                              const char *fstype, const char *key, int ownerUid) {
174
175    mkdir("/sdcard/android_secure", 0777);
176
177    if (lookupVolume(id)) {
178        LOGE("ASEC volume '%s' currently exists", id);
179        errno = EADDRINUSE;
180        return -1;
181    }
182
183    char asecFileName[255];
184    snprintf(asecFileName, sizeof(asecFileName),
185             "/sdcard/android_secure/%s.asec", id);
186
187    if (!access(asecFileName, F_OK)) {
188        LOGE("ASEC file '%s' currently exists - destroy it first! (%s)",
189             asecFileName, strerror(errno));
190        errno = EADDRINUSE;
191        return -1;
192    }
193
194    if (Loop::createImageFile(asecFileName, numSectors)) {
195        LOGE("ASEC image file creation failed (%s)", strerror(errno));
196        return -1;
197    }
198
199    char loopDevice[255];
200    if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) {
201        LOGE("ASEC loop device creation failed (%s)", strerror(errno));
202        unlink(asecFileName);
203        return -1;
204    }
205
206    char dmDevice[255];
207    bool cleanupDm = false;
208
209    if (strcmp(key, "none")) {
210        if (Devmapper::create(id, loopDevice, key, numSectors, dmDevice,
211                             sizeof(dmDevice))) {
212            LOGE("ASEC device mapping failed (%s)", strerror(errno));
213            Loop::destroyByDevice(loopDevice);
214            unlink(asecFileName);
215            return -1;
216        }
217        cleanupDm = true;
218    } else {
219        strcpy(dmDevice, loopDevice);
220    }
221
222    if (Fat::format(dmDevice)) {
223        LOGE("ASEC FAT format failed (%s)", strerror(errno));
224        if (cleanupDm) {
225            Devmapper::destroy(id);
226        }
227        Loop::destroyByDevice(loopDevice);
228        unlink(asecFileName);
229        return -1;
230    }
231
232    char mountPoint[255];
233
234    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
235    if (mkdir(mountPoint, 0777)) {
236        if (errno != EEXIST) {
237            LOGE("Mountpoint creation failed (%s)", strerror(errno));
238            if (cleanupDm) {
239                Devmapper::destroy(id);
240            }
241            Loop::destroyByDevice(loopDevice);
242            unlink(asecFileName);
243            return -1;
244        }
245    }
246
247    if (Fat::doMount(dmDevice, mountPoint, false, false, ownerUid,
248                     0, 0000, false)) {
249//                     0, 0007, false)) {
250        LOGE("ASEC FAT mount failed (%s)", strerror(errno));
251        if (cleanupDm) {
252            Devmapper::destroy(id);
253        }
254        Loop::destroyByDevice(loopDevice);
255        unlink(asecFileName);
256        return -1;
257    }
258
259    mActiveContainers->push_back(strdup(id));
260    return 0;
261}
262
263int VolumeManager::finalizeAsec(const char *id) {
264    char asecFileName[255];
265    char loopDevice[255];
266    char mountPoint[255];
267
268    snprintf(asecFileName, sizeof(asecFileName),
269             "/sdcard/android_secure/%s.asec", id);
270
271    if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
272        LOGE("Unable to finalize %s (%s)", id, strerror(errno));
273        return -1;
274    }
275
276    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
277    // XXX:
278    if (Fat::doMount(loopDevice, mountPoint, true, true, 0, 0, 0227, false)) {
279        LOGE("ASEC finalize mount failed (%s)", strerror(errno));
280        return -1;
281    }
282
283    LOGD("ASEC %s finalized", id);
284    return 0;
285}
286
287int VolumeManager::unmountAsec(const char *id) {
288    char asecFileName[255];
289    char mountPoint[255];
290
291    snprintf(asecFileName, sizeof(asecFileName),
292             "/sdcard/android_secure/%s.asec", id);
293    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
294
295    if (!isMountpointMounted(mountPoint)) {
296        LOGE("Unmount request for ASEC %s when not mounted", id);
297        errno = EINVAL;
298        return -1;
299    }
300
301    int i, rc;
302    for (i = 0; i < 10; i++) {
303        rc = umount(mountPoint);
304        if (!rc) {
305            break;
306        }
307        if (rc && (errno == EINVAL || errno == ENOENT)) {
308            rc = 0;
309            break;
310        }
311        LOGW("ASEC %s unmount attempt %d failed (%s)",
312              id, i +1, strerror(errno));
313
314        if (i >= 5) {
315            KillProcessesWithOpenFiles(mountPoint, (i < 7 ? 0 : 1),
316                                       NULL, 0);
317        }
318        usleep(1000 * 250);
319    }
320
321    if (rc) {
322        LOGE("Failed to unmount ASEC %s", id);
323        return -1;
324    }
325
326    unlink(mountPoint);
327
328    if (Devmapper::destroy(id) && errno != ENXIO) {
329        LOGE("Failed to destroy devmapper instance (%s)", strerror(errno));
330    }
331
332    char loopDevice[255];
333    if (!Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
334        Loop::destroyByDevice(loopDevice);
335    }
336
337    AsecIdCollection::iterator it;
338    for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) {
339        if (!strcmp(*it, id)) {
340            free(*it);
341            mActiveContainers->erase(it);
342            break;
343        }
344    }
345    if (it == mActiveContainers->end()) {
346        LOGW("mActiveContainers is inconsistent!");
347    }
348    return 0;
349}
350
351int VolumeManager::destroyAsec(const char *id) {
352    char asecFileName[255];
353    char mountPoint[255];
354
355    snprintf(asecFileName, sizeof(asecFileName),
356             "/sdcard/android_secure/%s.asec", id);
357    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
358
359    if (isMountpointMounted(mountPoint)) {
360        LOGD("Unmounting container before destroy");
361        if (unmountAsec(id)) {
362            LOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno));
363            return -1;
364        }
365    }
366
367    if (unlink(asecFileName)) {
368        LOGE("Failed to unlink asec '%s' (%s)", asecFileName, strerror(errno));
369        return -1;
370    }
371
372    LOGD("ASEC %s destroyed", id);
373    return 0;
374}
375
376int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
377    char asecFileName[255];
378    char mountPoint[255];
379
380    snprintf(asecFileName, sizeof(asecFileName),
381             "/sdcard/android_secure/%s.asec", id);
382    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
383
384    if (isMountpointMounted(mountPoint)) {
385        LOGE("ASEC %s already mounted", id);
386        errno = EBUSY;
387        return -1;
388    }
389
390    char loopDevice[255];
391    if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
392        if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) {
393            LOGE("ASEC loop device creation failed (%s)", strerror(errno));
394            return -1;
395        }
396        LOGD("New loop device created at %s", loopDevice);
397    } else {
398        LOGD("Found active loopback for %s at %s", asecFileName, loopDevice);
399    }
400
401    char dmDevice[255];
402    bool cleanupDm = false;
403    if (strcmp(key, "none")) {
404        if (Devmapper::lookupActive(id, dmDevice, sizeof(dmDevice))) {
405            unsigned int nr_sec = 0;
406            int fd;
407
408            if ((fd = open(loopDevice, O_RDWR)) < 0) {
409                LOGE("Failed to open loopdevice (%s)", strerror(errno));
410                Loop::destroyByDevice(loopDevice);
411                return -1;
412            }
413
414            if (ioctl(fd, BLKGETSIZE, &nr_sec)) {
415                LOGE("Failed to get loop size (%s)", strerror(errno));
416                Loop::destroyByDevice(loopDevice);
417                close(fd);
418                return -1;
419            }
420            close(fd);
421            if (Devmapper::create(id, loopDevice, key, nr_sec,
422                                  dmDevice, sizeof(dmDevice))) {
423                LOGE("ASEC device mapping failed (%s)", strerror(errno));
424                Loop::destroyByDevice(loopDevice);
425                return -1;
426            }
427            LOGD("New devmapper instance created at %s", dmDevice);
428        } else {
429            LOGD("Found active devmapper for %s at %s", asecFileName, dmDevice);
430        }
431        cleanupDm = true;
432    } else {
433        strcpy(dmDevice, loopDevice);
434    }
435
436    if (mkdir(mountPoint, 0777)) {
437        if (errno != EEXIST) {
438            LOGE("Mountpoint creation failed (%s)", strerror(errno));
439            if (cleanupDm) {
440                Devmapper::destroy(id);
441            }
442            Loop::destroyByDevice(loopDevice);
443            return -1;
444        }
445    }
446
447    if (Fat::doMount(dmDevice, mountPoint, true, false, ownerUid, 0,
448                     0222, false)) {
449//                     0227, false)) {
450        LOGE("ASEC mount failed (%s)", strerror(errno));
451        if (cleanupDm) {
452            Devmapper::destroy(id);
453        }
454        Loop::destroyByDevice(loopDevice);
455        return -1;
456    }
457
458    mActiveContainers->push_back(strdup(id));
459    LOGD("ASEC %s mounted", id);
460    return 0;
461}
462
463int VolumeManager::mountVolume(const char *label) {
464    Volume *v = lookupVolume(label);
465
466    if (!v) {
467        errno = ENOENT;
468        return -1;
469    }
470
471    return v->mountVol();
472}
473
474int VolumeManager::shareAvailable(const char *method, bool *avail) {
475
476    if (strcmp(method, "ums")) {
477        errno = ENOSYS;
478        return -1;
479    }
480
481    if (mUsbMassStorageConnected)
482        *avail = true;
483    else
484        *avail = false;
485    return 0;
486}
487
488int VolumeManager::simulate(const char *cmd, const char *arg) {
489
490    if (!strcmp(cmd, "ums")) {
491        if (!strcmp(arg, "connect")) {
492            notifyUmsConnected(true);
493        } else if (!strcmp(arg, "disconnect")) {
494            notifyUmsConnected(false);
495        } else {
496            errno = EINVAL;
497            return -1;
498        }
499    } else {
500        errno = EINVAL;
501        return -1;
502    }
503    return 0;
504}
505
506int VolumeManager::shareVolume(const char *label, const char *method) {
507    Volume *v = lookupVolume(label);
508
509    if (!v) {
510        errno = ENOENT;
511        return -1;
512    }
513
514    /*
515     * Eventually, we'll want to support additional share back-ends,
516     * some of which may work while the media is mounted. For now,
517     * we just support UMS
518     */
519    if (strcmp(method, "ums")) {
520        errno = ENOSYS;
521        return -1;
522    }
523
524    if (v->getState() == Volume::State_NoMedia) {
525        errno = ENODEV;
526        return -1;
527    }
528
529    if (v->getState() != Volume::State_Idle) {
530        // You need to unmount manually befoe sharing
531        errno = EBUSY;
532        return -1;
533    }
534
535    dev_t d = v->getDiskDevice();
536    if ((MAJOR(d) == 0) && (MINOR(d) == 0)) {
537        // This volume does not support raw disk access
538        errno = EINVAL;
539        return -1;
540    }
541
542    int fd;
543    char nodepath[255];
544    snprintf(nodepath,
545             sizeof(nodepath), "/dev/block/vold/%d:%d",
546             MAJOR(d), MINOR(d));
547
548    if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file",
549                   O_WRONLY)) < 0) {
550        LOGE("Unable to open ums lunfile (%s)", strerror(errno));
551        return -1;
552    }
553
554    if (write(fd, nodepath, strlen(nodepath)) < 0) {
555        LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
556        close(fd);
557        return -1;
558    }
559
560    close(fd);
561    v->handleVolumeShared();
562    return 0;
563}
564
565int VolumeManager::unshareVolume(const char *label, const char *method) {
566    Volume *v = lookupVolume(label);
567
568    if (!v) {
569        errno = ENOENT;
570        return -1;
571    }
572
573    if (strcmp(method, "ums")) {
574        errno = ENOSYS;
575        return -1;
576    }
577
578    if (v->getState() != Volume::State_Shared) {
579        errno = EINVAL;
580        return -1;
581    }
582
583    dev_t d = v->getDiskDevice();
584
585    int fd;
586    char nodepath[255];
587    snprintf(nodepath,
588             sizeof(nodepath), "/dev/block/vold/%d:%d",
589             MAJOR(d), MINOR(d));
590
591    if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) {
592        LOGE("Unable to open ums lunfile (%s)", strerror(errno));
593        return -1;
594    }
595
596    char ch = 0;
597    if (write(fd, &ch, 1) < 0) {
598        LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
599        close(fd);
600        return -1;
601    }
602
603    close(fd);
604    v->handleVolumeUnshared();
605    return 0;
606}
607
608int VolumeManager::unmountVolume(const char *label) {
609    Volume *v = lookupVolume(label);
610
611    if (!v) {
612        errno = ENOENT;
613        return -1;
614    }
615
616    if (v->getState() == Volume::State_NoMedia) {
617        errno = ENODEV;
618        return -1;
619    }
620
621    if (v->getState() != Volume::State_Mounted) {
622        LOGW("Attempt to unmount volume which isn't mounted (%d)\n",
623             v->getState());
624        errno = EBUSY;
625        return -1;
626    }
627
628    while(mActiveContainers->size()) {
629        AsecIdCollection::iterator it = mActiveContainers->begin();
630        LOGI("Unmounting ASEC %s (dependant on %s)", *it, v->getMountpoint());
631        if (unmountAsec(*it)) {
632            LOGE("Failed to unmount ASEC %s (%s) - unmount of %s may fail!", *it,
633                 strerror(errno), v->getMountpoint());
634        }
635    }
636
637    return v->unmountVol();
638}
639
640/*
641 * Looks up a volume by it's label or mount-point
642 */
643Volume *VolumeManager::lookupVolume(const char *label) {
644    VolumeCollection::iterator i;
645
646    for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
647        if (label[0] == '/') {
648            if (!strcmp(label, (*i)->getMountpoint()))
649                return (*i);
650        } else {
651            if (!strcmp(label, (*i)->getLabel()))
652                return (*i);
653        }
654    }
655    return NULL;
656}
657
658bool VolumeManager::isMountpointMounted(const char *mp)
659{
660    char device[256];
661    char mount_path[256];
662    char rest[256];
663    FILE *fp;
664    char line[1024];
665
666    if (!(fp = fopen("/proc/mounts", "r"))) {
667        LOGE("Error opening /proc/mounts (%s)", strerror(errno));
668        return false;
669    }
670
671    while(fgets(line, sizeof(line), fp)) {
672        line[strlen(line)-1] = '\0';
673        sscanf(line, "%255s %255s %255s\n", device, mount_path, rest);
674        if (!strcmp(mount_path, mp)) {
675            fclose(fp);
676            return true;
677        }
678
679    }
680
681    fclose(fp);
682    return false;
683}
684
685