VolumeManager.cpp revision 048b0801fcd6fcfbb8fa812284c751181e4821b8 
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::renameAsec(const char *id1, const char *id2) {
288    char *asecFilename1;
289    char *asecFilename2;
290    char mountPoint[255];
291
292    asprintf(&asecFilename1, "/sdcard/android_secure/%s.asec", id1);
293    asprintf(&asecFilename2, "/sdcard/android_secure/%s.asec", id2);
294
295    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id1);
296    if (isMountpointMounted(mountPoint)) {
297        LOGW("Rename attempt when src mounted");
298        errno = EBUSY;
299        goto out_err;
300    }
301
302    if (!access(asecFilename2, F_OK)) {
303        LOGE("Rename attempt when dst exists");
304        errno = EADDRINUSE;
305        goto out_err;
306    }
307
308    if (rename(asecFilename1, asecFilename2)) {
309        LOGE("Rename of '%s' to '%s' failed (%s)", asecFilename1, asecFilename2, strerror(errno));
310        goto out_err;
311    }
312
313    free(asecFilename1);
314    free(asecFilename2);
315    return 0;
316
317out_err:
318    free(asecFilename1);
319    free(asecFilename2);
320    return -1;
321}
322
323int VolumeManager::unmountAsec(const char *id) {
324    char asecFileName[255];
325    char mountPoint[255];
326
327    snprintf(asecFileName, sizeof(asecFileName),
328             "/sdcard/android_secure/%s.asec", id);
329    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
330
331    if (!isMountpointMounted(mountPoint)) {
332        LOGE("Unmount request for ASEC %s when not mounted", id);
333        errno = EINVAL;
334        return -1;
335    }
336
337    int i, rc;
338    for (i = 0; i < 10; i++) {
339        rc = umount(mountPoint);
340        if (!rc) {
341            break;
342        }
343        if (rc && (errno == EINVAL || errno == ENOENT)) {
344            rc = 0;
345            break;
346        }
347        LOGW("ASEC %s unmount attempt %d failed (%s)",
348              id, i +1, strerror(errno));
349
350        if (i >= 5) {
351            KillProcessesWithOpenFiles(mountPoint, (i < 7 ? 0 : 1),
352                                       NULL, 0);
353        }
354        usleep(1000 * 250);
355    }
356
357    if (rc) {
358        LOGE("Failed to unmount ASEC %s", id);
359        return -1;
360    }
361
362    unlink(mountPoint);
363
364    if (Devmapper::destroy(id) && errno != ENXIO) {
365        LOGE("Failed to destroy devmapper instance (%s)", strerror(errno));
366    }
367
368    char loopDevice[255];
369    if (!Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
370        Loop::destroyByDevice(loopDevice);
371    }
372
373    AsecIdCollection::iterator it;
374    for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) {
375        if (!strcmp(*it, id)) {
376            free(*it);
377            mActiveContainers->erase(it);
378            break;
379        }
380    }
381    if (it == mActiveContainers->end()) {
382        LOGW("mActiveContainers is inconsistent!");
383    }
384    return 0;
385}
386
387int VolumeManager::destroyAsec(const char *id) {
388    char asecFileName[255];
389    char mountPoint[255];
390
391    snprintf(asecFileName, sizeof(asecFileName),
392             "/sdcard/android_secure/%s.asec", id);
393    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
394
395    if (isMountpointMounted(mountPoint)) {
396        LOGD("Unmounting container before destroy");
397        if (unmountAsec(id)) {
398            LOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno));
399            return -1;
400        }
401    }
402
403    if (unlink(asecFileName)) {
404        LOGE("Failed to unlink asec '%s' (%s)", asecFileName, strerror(errno));
405        return -1;
406    }
407
408    LOGD("ASEC %s destroyed", id);
409    return 0;
410}
411
412int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
413    char asecFileName[255];
414    char mountPoint[255];
415
416    snprintf(asecFileName, sizeof(asecFileName),
417             "/sdcard/android_secure/%s.asec", id);
418    snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
419
420    if (isMountpointMounted(mountPoint)) {
421        LOGE("ASEC %s already mounted", id);
422        errno = EBUSY;
423        return -1;
424    }
425
426    char loopDevice[255];
427    if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
428        if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) {
429            LOGE("ASEC loop device creation failed (%s)", strerror(errno));
430            return -1;
431        }
432        LOGD("New loop device created at %s", loopDevice);
433    } else {
434        LOGD("Found active loopback for %s at %s", asecFileName, loopDevice);
435    }
436
437    char dmDevice[255];
438    bool cleanupDm = false;
439    if (strcmp(key, "none")) {
440        if (Devmapper::lookupActive(id, dmDevice, sizeof(dmDevice))) {
441            unsigned int nr_sec = 0;
442            int fd;
443
444            if ((fd = open(loopDevice, O_RDWR)) < 0) {
445                LOGE("Failed to open loopdevice (%s)", strerror(errno));
446                Loop::destroyByDevice(loopDevice);
447                return -1;
448            }
449
450            if (ioctl(fd, BLKGETSIZE, &nr_sec)) {
451                LOGE("Failed to get loop size (%s)", strerror(errno));
452                Loop::destroyByDevice(loopDevice);
453                close(fd);
454                return -1;
455            }
456            close(fd);
457            if (Devmapper::create(id, loopDevice, key, nr_sec,
458                                  dmDevice, sizeof(dmDevice))) {
459                LOGE("ASEC device mapping failed (%s)", strerror(errno));
460                Loop::destroyByDevice(loopDevice);
461                return -1;
462            }
463            LOGD("New devmapper instance created at %s", dmDevice);
464        } else {
465            LOGD("Found active devmapper for %s at %s", asecFileName, dmDevice);
466        }
467        cleanupDm = true;
468    } else {
469        strcpy(dmDevice, loopDevice);
470    }
471
472    if (mkdir(mountPoint, 0777)) {
473        if (errno != EEXIST) {
474            LOGE("Mountpoint creation failed (%s)", strerror(errno));
475            if (cleanupDm) {
476                Devmapper::destroy(id);
477            }
478            Loop::destroyByDevice(loopDevice);
479            return -1;
480        }
481    }
482
483    if (Fat::doMount(dmDevice, mountPoint, true, false, ownerUid, 0,
484                     0222, false)) {
485//                     0227, false)) {
486        LOGE("ASEC mount failed (%s)", strerror(errno));
487        if (cleanupDm) {
488            Devmapper::destroy(id);
489        }
490        Loop::destroyByDevice(loopDevice);
491        return -1;
492    }
493
494    mActiveContainers->push_back(strdup(id));
495    LOGD("ASEC %s mounted", id);
496    return 0;
497}
498
499int VolumeManager::mountVolume(const char *label) {
500    Volume *v = lookupVolume(label);
501
502    if (!v) {
503        errno = ENOENT;
504        return -1;
505    }
506
507    return v->mountVol();
508}
509
510int VolumeManager::shareAvailable(const char *method, bool *avail) {
511
512    if (strcmp(method, "ums")) {
513        errno = ENOSYS;
514        return -1;
515    }
516
517    if (mUsbMassStorageConnected)
518        *avail = true;
519    else
520        *avail = false;
521    return 0;
522}
523
524int VolumeManager::simulate(const char *cmd, const char *arg) {
525
526    if (!strcmp(cmd, "ums")) {
527        if (!strcmp(arg, "connect")) {
528            notifyUmsConnected(true);
529        } else if (!strcmp(arg, "disconnect")) {
530            notifyUmsConnected(false);
531        } else {
532            errno = EINVAL;
533            return -1;
534        }
535    } else {
536        errno = EINVAL;
537        return -1;
538    }
539    return 0;
540}
541
542int VolumeManager::shareVolume(const char *label, const char *method) {
543    Volume *v = lookupVolume(label);
544
545    if (!v) {
546        errno = ENOENT;
547        return -1;
548    }
549
550    /*
551     * Eventually, we'll want to support additional share back-ends,
552     * some of which may work while the media is mounted. For now,
553     * we just support UMS
554     */
555    if (strcmp(method, "ums")) {
556        errno = ENOSYS;
557        return -1;
558    }
559
560    if (v->getState() == Volume::State_NoMedia) {
561        errno = ENODEV;
562        return -1;
563    }
564
565    if (v->getState() != Volume::State_Idle) {
566        // You need to unmount manually befoe sharing
567        errno = EBUSY;
568        return -1;
569    }
570
571    dev_t d = v->getDiskDevice();
572    if ((MAJOR(d) == 0) && (MINOR(d) == 0)) {
573        // This volume does not support raw disk access
574        errno = EINVAL;
575        return -1;
576    }
577
578    int fd;
579    char nodepath[255];
580    snprintf(nodepath,
581             sizeof(nodepath), "/dev/block/vold/%d:%d",
582             MAJOR(d), MINOR(d));
583
584    if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file",
585                   O_WRONLY)) < 0) {
586        LOGE("Unable to open ums lunfile (%s)", strerror(errno));
587        return -1;
588    }
589
590    if (write(fd, nodepath, strlen(nodepath)) < 0) {
591        LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
592        close(fd);
593        return -1;
594    }
595
596    close(fd);
597    v->handleVolumeShared();
598    return 0;
599}
600
601int VolumeManager::unshareVolume(const char *label, const char *method) {
602    Volume *v = lookupVolume(label);
603
604    if (!v) {
605        errno = ENOENT;
606        return -1;
607    }
608
609    if (strcmp(method, "ums")) {
610        errno = ENOSYS;
611        return -1;
612    }
613
614    if (v->getState() != Volume::State_Shared) {
615        errno = EINVAL;
616        return -1;
617    }
618
619    dev_t d = v->getDiskDevice();
620
621    int fd;
622    char nodepath[255];
623    snprintf(nodepath,
624             sizeof(nodepath), "/dev/block/vold/%d:%d",
625             MAJOR(d), MINOR(d));
626
627    if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) {
628        LOGE("Unable to open ums lunfile (%s)", strerror(errno));
629        return -1;
630    }
631
632    char ch = 0;
633    if (write(fd, &ch, 1) < 0) {
634        LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
635        close(fd);
636        return -1;
637    }
638
639    close(fd);
640    v->handleVolumeUnshared();
641    return 0;
642}
643
644int VolumeManager::unmountVolume(const char *label) {
645    Volume *v = lookupVolume(label);
646
647    if (!v) {
648        errno = ENOENT;
649        return -1;
650    }
651
652    if (v->getState() == Volume::State_NoMedia) {
653        errno = ENODEV;
654        return -1;
655    }
656
657    if (v->getState() != Volume::State_Mounted) {
658        LOGW("Attempt to unmount volume which isn't mounted (%d)\n",
659             v->getState());
660        errno = EBUSY;
661        return -1;
662    }
663
664    while(mActiveContainers->size()) {
665        AsecIdCollection::iterator it = mActiveContainers->begin();
666        LOGI("Unmounting ASEC %s (dependant on %s)", *it, v->getMountpoint());
667        if (unmountAsec(*it)) {
668            LOGE("Failed to unmount ASEC %s (%s) - unmount of %s may fail!", *it,
669                 strerror(errno), v->getMountpoint());
670        }
671    }
672
673    return v->unmountVol();
674}
675
676/*
677 * Looks up a volume by it's label or mount-point
678 */
679Volume *VolumeManager::lookupVolume(const char *label) {
680    VolumeCollection::iterator i;
681
682    for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
683        if (label[0] == '/') {
684            if (!strcmp(label, (*i)->getMountpoint()))
685                return (*i);
686        } else {
687            if (!strcmp(label, (*i)->getLabel()))
688                return (*i);
689        }
690    }
691    return NULL;
692}
693
694bool VolumeManager::isMountpointMounted(const char *mp)
695{
696    char device[256];
697    char mount_path[256];
698    char rest[256];
699    FILE *fp;
700    char line[1024];
701
702    if (!(fp = fopen("/proc/mounts", "r"))) {
703        LOGE("Error opening /proc/mounts (%s)", strerror(errno));
704        return false;
705    }
706
707    while(fgets(line, sizeof(line), fp)) {
708        line[strlen(line)-1] = '\0';
709        sscanf(line, "%255s %255s %255s\n", device, mount_path, rest);
710        if (!strcmp(mount_path, mp)) {
711            fclose(fp);
712            return true;
713        }
714
715    }
716
717    fclose(fp);
718    return false;
719}
720
721