VolumeManager.cpp revision 88705166ab82057090a070c6d4200c3d9db76f11 
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
169    if (!isMountpointMounted(mountPoint)) {
170        errno = ENOENT;
171        return -1;
172    }
173    snprintf(buffer, maxlen, "/asec/%s", id);
174    return 0;
175}
176
177int VolumeManager::createAsec(const char *id, unsigned int numSectors,
178                              const char *fstype, const char *key, int ownerUid) {
179
180    mkdir("/sdcard/android_secure", 0777);
181
182    if (lookupVolume(id)) {
183        LOGE("ASEC volume '%s' currently exists", id);
184        errno = EADDRINUSE;
185        return -1;
186    }
187
188    char asecFileName[255];
189    snprintf(asecFileName, sizeof(asecFileName),
190             "/sdcard/android_secure/%s.asec", id);
191
192    if (!access(asecFileName, F_OK)) {
193        LOGE("ASEC file '%s' currently exists - destroy it first! (%s)",
194             asecFileName, strerror(errno));
195        errno = EADDRINUSE;
196        return -1;
197    }
198
199    if (Loop::createImageFile(asecFileName, numSectors)) {
200        LOGE("ASEC image file creation failed (%s)", strerror(errno));
201        return -1;
202    }
203
204    char loopDevice[255];
205    if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) {
206        LOGE("ASEC loop device creation failed (%s)", strerror(errno));
207        unlink(asecFileName);
208        return -1;
209    }
210
211    char dmDevice[255];
212    bool cleanupDm = false;
213
214    if (strcmp(key, "none")) {
215        if (Devmapper::create(id, loopDevice, key, numSectors, dmDevice,
216                             sizeof(dmDevice))) {
217            LOGE("ASEC device mapping failed (%s)", strerror(errno));
218            Loop::destroyByDevice(loopDevice);
219            unlink(asecFileName);
220            return -1;
221        }
222        cleanupDm = true;
223    } else {
224        strcpy(dmDevice, loopDevice);
225    }
226
227    if (Fat::format(dmDevice)) {
228        LOGE("ASEC FAT format failed (%s)", strerror(errno));
229        if (cleanupDm) {
230            Devmapper::destroy(id);
231        }
232        Loop::destroyByDevice(loopDevice);
233        unlink(asecFileName);
234        return -1;
235    }
236
237    char mountPoint[255];
238
239    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
240    if (mkdir(mountPoint, 0777)) {
241        if (errno != EEXIST) {
242            LOGE("Mountpoint creation failed (%s)", strerror(errno));
243            if (cleanupDm) {
244                Devmapper::destroy(id);
245            }
246            Loop::destroyByDevice(loopDevice);
247            unlink(asecFileName);
248            return -1;
249        }
250    }
251
252    if (Fat::doMount(dmDevice, mountPoint, false, false, ownerUid,
253                     0, 0000, false)) {
254//                     0, 0007, false)) {
255        LOGE("ASEC FAT mount failed (%s)", strerror(errno));
256        if (cleanupDm) {
257            Devmapper::destroy(id);
258        }
259        Loop::destroyByDevice(loopDevice);
260        unlink(asecFileName);
261        return -1;
262    }
263
264    mActiveContainers->push_back(strdup(id));
265    return 0;
266}
267
268int VolumeManager::finalizeAsec(const char *id) {
269    char asecFileName[255];
270    char loopDevice[255];
271    char mountPoint[255];
272
273    snprintf(asecFileName, sizeof(asecFileName),
274             "/sdcard/android_secure/%s.asec", id);
275
276    if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
277        LOGE("Unable to finalize %s (%s)", id, strerror(errno));
278        return -1;
279    }
280
281    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
282    // XXX:
283    if (Fat::doMount(loopDevice, mountPoint, true, true, 0, 0, 0227, false)) {
284        LOGE("ASEC finalize mount failed (%s)", strerror(errno));
285        return -1;
286    }
287
288    LOGD("ASEC %s finalized", id);
289    return 0;
290}
291
292int VolumeManager::unmountAsec(const char *id) {
293    char asecFileName[255];
294    char mountPoint[255];
295
296    snprintf(asecFileName, sizeof(asecFileName),
297             "/sdcard/android_secure/%s.asec", id);
298    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
299
300    if (!isMountpointMounted(mountPoint)) {
301        LOGE("Unmount request for ASEC %s when not mounted", id);
302        errno = EINVAL;
303        return -1;
304    }
305
306    int i, rc;
307    for (i = 0; i < 10; i++) {
308        rc = umount(mountPoint);
309        if (!rc) {
310            break;
311        }
312        if (rc && (errno == EINVAL || errno == ENOENT)) {
313            rc = 0;
314            break;
315        }
316        LOGW("ASEC %s unmount attempt %d failed (%s)",
317              id, i +1, strerror(errno));
318
319        if (i >= 5) {
320            KillProcessesWithOpenFiles(mountPoint, (i < 7 ? 0 : 1),
321                                       NULL, 0);
322        }
323        usleep(1000 * 250);
324    }
325
326    if (rc) {
327        LOGE("Failed to unmount ASEC %s", id);
328        return -1;
329    }
330
331    unlink(mountPoint);
332
333    if (Devmapper::destroy(id) && errno != ENXIO) {
334        LOGE("Failed to destroy devmapper instance (%s)", strerror(errno));
335    }
336
337    char loopDevice[255];
338    if (!Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
339        Loop::destroyByDevice(loopDevice);
340    }
341
342    AsecIdCollection::iterator it;
343    for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) {
344        if (!strcmp(*it, id)) {
345            free(*it);
346            mActiveContainers->erase(it);
347            break;
348        }
349    }
350    if (it == mActiveContainers->end()) {
351        LOGW("mActiveContainers is inconsistent!");
352    }
353    return 0;
354}
355
356int VolumeManager::destroyAsec(const char *id) {
357    char asecFileName[255];
358    char mountPoint[255];
359
360    snprintf(asecFileName, sizeof(asecFileName),
361             "/sdcard/android_secure/%s.asec", id);
362    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
363
364    if (isMountpointMounted(mountPoint)) {
365        if (unmountAsec(id)) {
366            LOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno));
367            return -1;
368        }
369    }
370
371    if (unlink(asecFileName)) {
372        LOGE("Failed to unlink asec %s (%s)", id, strerror(errno));
373        return -1;
374    }
375
376    LOGD("ASEC %s destroyed", id);
377    return 0;
378}
379
380int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
381    char asecFileName[255];
382    char mountPoint[255];
383
384    snprintf(asecFileName, sizeof(asecFileName),
385             "/sdcard/android_secure/%s.asec", id);
386    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
387
388    if (isMountpointMounted(mountPoint)) {
389        LOGE("ASEC %s already mounted", id);
390        errno = EBUSY;
391        return -1;
392    }
393
394    char loopDevice[255];
395    if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
396        if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) {
397            LOGE("ASEC loop device creation failed (%s)", strerror(errno));
398            return -1;
399        }
400        LOGD("New loop device created at %s", loopDevice);
401    } else {
402        LOGD("Found active loopback for %s at %s", asecFileName, loopDevice);
403    }
404
405    char dmDevice[255];
406    bool cleanupDm = false;
407    if (strcmp(key, "none")) {
408        if (Devmapper::lookupActive(id, dmDevice, sizeof(dmDevice))) {
409            unsigned int nr_sec = 0;
410            int fd;
411
412            if ((fd = open(loopDevice, O_RDWR)) < 0) {
413                LOGE("Failed to open loopdevice (%s)", strerror(errno));
414                Loop::destroyByDevice(loopDevice);
415                return -1;
416            }
417
418            if (ioctl(fd, BLKGETSIZE, &nr_sec)) {
419                LOGE("Failed to get loop size (%s)", strerror(errno));
420                Loop::destroyByDevice(loopDevice);
421                close(fd);
422                return -1;
423            }
424            close(fd);
425            if (Devmapper::create(id, loopDevice, key, nr_sec,
426                                  dmDevice, sizeof(dmDevice))) {
427                LOGE("ASEC device mapping failed (%s)", strerror(errno));
428                Loop::destroyByDevice(loopDevice);
429                return -1;
430            }
431            LOGD("New devmapper instance created at %s", dmDevice);
432        } else {
433            LOGD("Found active devmapper for %s at %s", asecFileName, dmDevice);
434        }
435        cleanupDm = true;
436    } else {
437        strcpy(dmDevice, loopDevice);
438    }
439
440    if (mkdir(mountPoint, 0777)) {
441        if (errno != EEXIST) {
442            LOGE("Mountpoint creation failed (%s)", strerror(errno));
443            if (cleanupDm) {
444                Devmapper::destroy(id);
445            }
446            Loop::destroyByDevice(loopDevice);
447            return -1;
448        }
449    }
450
451    if (Fat::doMount(dmDevice, mountPoint, true, false, ownerUid, 0,
452                     0222, false)) {
453//                     0227, false)) {
454        LOGE("ASEC mount failed (%s)", strerror(errno));
455        if (cleanupDm) {
456            Devmapper::destroy(id);
457        }
458        Loop::destroyByDevice(loopDevice);
459        return -1;
460    }
461
462    mActiveContainers->push_back(strdup(id));
463    LOGD("ASEC %s mounted", id);
464    return 0;
465}
466
467int VolumeManager::mountVolume(const char *label) {
468    Volume *v = lookupVolume(label);
469
470    if (!v) {
471        errno = ENOENT;
472        return -1;
473    }
474
475    return v->mountVol();
476}
477
478int VolumeManager::shareAvailable(const char *method, bool *avail) {
479
480    if (strcmp(method, "ums")) {
481        errno = ENOSYS;
482        return -1;
483    }
484
485    if (mUsbMassStorageConnected)
486        *avail = true;
487    else
488        *avail = false;
489    return 0;
490}
491
492int VolumeManager::simulate(const char *cmd, const char *arg) {
493
494    if (!strcmp(cmd, "ums")) {
495        if (!strcmp(arg, "connect")) {
496            notifyUmsConnected(true);
497        } else if (!strcmp(arg, "disconnect")) {
498            notifyUmsConnected(false);
499        } else {
500            errno = EINVAL;
501            return -1;
502        }
503    } else {
504        errno = EINVAL;
505        return -1;
506    }
507    return 0;
508}
509
510int VolumeManager::shareVolume(const char *label, const char *method) {
511    Volume *v = lookupVolume(label);
512
513    if (!v) {
514        errno = ENOENT;
515        return -1;
516    }
517
518    /*
519     * Eventually, we'll want to support additional share back-ends,
520     * some of which may work while the media is mounted. For now,
521     * we just support UMS
522     */
523    if (strcmp(method, "ums")) {
524        errno = ENOSYS;
525        return -1;
526    }
527
528    if (v->getState() == Volume::State_NoMedia) {
529        errno = ENODEV;
530        return -1;
531    }
532
533    if (v->getState() != Volume::State_Idle) {
534        // You need to unmount manually befoe sharing
535        errno = EBUSY;
536        return -1;
537    }
538
539    dev_t d = v->getDiskDevice();
540    if ((MAJOR(d) == 0) && (MINOR(d) == 0)) {
541        // This volume does not support raw disk access
542        errno = EINVAL;
543        return -1;
544    }
545
546    int fd;
547    char nodepath[255];
548    snprintf(nodepath,
549             sizeof(nodepath), "/dev/block/vold/%d:%d",
550             MAJOR(d), MINOR(d));
551
552    if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file",
553                   O_WRONLY)) < 0) {
554        LOGE("Unable to open ums lunfile (%s)", strerror(errno));
555        return -1;
556    }
557
558    if (write(fd, nodepath, strlen(nodepath)) < 0) {
559        LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
560        close(fd);
561        return -1;
562    }
563
564    close(fd);
565    v->handleVolumeShared();
566    return 0;
567}
568
569int VolumeManager::unshareVolume(const char *label, const char *method) {
570    Volume *v = lookupVolume(label);
571
572    if (!v) {
573        errno = ENOENT;
574        return -1;
575    }
576
577    if (strcmp(method, "ums")) {
578        errno = ENOSYS;
579        return -1;
580    }
581
582    if (v->getState() != Volume::State_Shared) {
583        errno = EINVAL;
584        return -1;
585    }
586
587    dev_t d = v->getDiskDevice();
588
589    int fd;
590    char nodepath[255];
591    snprintf(nodepath,
592             sizeof(nodepath), "/dev/block/vold/%d:%d",
593             MAJOR(d), MINOR(d));
594
595    if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) {
596        LOGE("Unable to open ums lunfile (%s)", strerror(errno));
597        return -1;
598    }
599
600    char ch = 0;
601    if (write(fd, &ch, 1) < 0) {
602        LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
603        close(fd);
604        return -1;
605    }
606
607    close(fd);
608    v->handleVolumeUnshared();
609    return 0;
610}
611
612int VolumeManager::unmountVolume(const char *label) {
613    Volume *v = lookupVolume(label);
614
615    if (!v) {
616        errno = ENOENT;
617        return -1;
618    }
619
620    if (v->getState() == Volume::State_NoMedia) {
621        errno = ENODEV;
622        return -1;
623    }
624
625    if (v->getState() != Volume::State_Mounted) {
626        LOGW("Attempt to unmount volume which isn't mounted (%d)\n",
627             v->getState());
628        errno = EBUSY;
629        return -1;
630    }
631
632    while(mActiveContainers->size()) {
633        AsecIdCollection::iterator it = mActiveContainers->begin();
634        LOGI("Unmounting ASEC %s (dependant on %s)", *it, v->getMountpoint());
635        if (unmountAsec(*it)) {
636            LOGE("Failed to unmount ASEC %s (%s) - unmount of %s may fail!", *it,
637                 strerror(errno), v->getMountpoint());
638        }
639    }
640
641    return v->unmountVol();
642}
643
644/*
645 * Looks up a volume by it's label or mount-point
646 */
647Volume *VolumeManager::lookupVolume(const char *label) {
648    VolumeCollection::iterator i;
649
650    for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
651        if (label[0] == '/') {
652            if (!strcmp(label, (*i)->getMountpoint()))
653                return (*i);
654        } else {
655            if (!strcmp(label, (*i)->getLabel()))
656                return (*i);
657        }
658    }
659    return NULL;
660}
661
662bool VolumeManager::isMountpointMounted(const char *mp)
663{
664    char device[256];
665    char mount_path[256];
666    char rest[256];
667    FILE *fp;
668    char line[1024];
669
670    if (!(fp = fopen("/proc/mounts", "r"))) {
671        LOGE("Error opening /proc/mounts (%s)", strerror(errno));
672        return false;
673    }
674
675    while(fgets(line, sizeof(line), fp)) {
676        line[strlen(line)-1] = '\0';
677        sscanf(line, "%255s %255s %255s\n", device, mount_path, rest);
678        if (!strcmp(mount_path, mp)) {
679            fclose(fp);
680            return true;
681        }
682
683    }
684
685    fclose(fp);
686    return false;
687}
688
689