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271 lines
7.6 KiB
271 lines
7.6 KiB
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "sehandle.h"
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#include "Utils.h"
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#include "Process.h"
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#include <base/logging.h>
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#include <base/stringprintf.h>
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#include <cutils/fs.h>
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#include <private/android_filesystem_config.h>
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#include <logwrap/logwrap.h>
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#include <fcntl.h>
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#include <linux/fs.h>
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#include <stdlib.h>
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#include <sys/mount.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#ifndef UMOUNT_NOFOLLOW
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#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */
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#endif
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using android::base::StringPrintf;
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namespace android {
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namespace vold {
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security_context_t sBlkidContext = nullptr;
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security_context_t sBlkidUntrustedContext = nullptr;
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security_context_t sFsckContext = nullptr;
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security_context_t sFsckUntrustedContext = nullptr;
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static const char* kBlkidPath = "/system/bin/blkid";
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status_t CreateDeviceNode(const std::string& path, dev_t dev) {
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const char* cpath = path.c_str();
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status_t res = 0;
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char* secontext = nullptr;
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if (sehandle) {
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if (!selabel_lookup(sehandle, &secontext, cpath, S_IFBLK)) {
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setfscreatecon(secontext);
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}
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}
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mode_t mode = 0660 | S_IFBLK;
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if (mknod(cpath, mode, dev) < 0) {
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if (errno != EEXIST) {
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PLOG(ERROR) << "Failed to create device node for " << major(dev)
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<< ":" << minor(dev) << " at " << path;
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res = -errno;
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}
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}
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if (secontext) {
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setfscreatecon(nullptr);
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freecon(secontext);
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}
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return res;
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}
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status_t DestroyDeviceNode(const std::string& path) {
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const char* cpath = path.c_str();
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if (TEMP_FAILURE_RETRY(unlink(cpath))) {
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return -errno;
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} else {
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return OK;
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}
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}
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status_t ForceUnmount(const std::string& path) {
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const char* cpath = path.c_str();
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if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
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return OK;
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}
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PLOG(WARNING) << "Failed to unmount " << path << "; sending SIGTERM";
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Process::killProcessesWithOpenFiles(cpath, SIGTERM);
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sleep(5);
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if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
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return OK;
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}
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PLOG(WARNING) << "Failed to unmount " << path << "; sending SIGKILL";
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Process::killProcessesWithOpenFiles(cpath, SIGKILL);
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sleep(5);
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if (!umount2(cpath, UMOUNT_NOFOLLOW) || errno == EINVAL || errno == ENOENT) {
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return OK;
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}
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PLOG(ERROR) << "Failed to unmount " << path << "; giving up";
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return -errno;
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}
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status_t BindMount(const std::string& source, const std::string& target) {
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if (::mount(source.c_str(), target.c_str(), "", MS_BIND, NULL)) {
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PLOG(ERROR) << "Failed to bind mount " << source << " to " << target;
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return -errno;
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}
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return OK;
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}
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static status_t readMetadata(const std::string& path, std::string& fsType,
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std::string& fsUuid, std::string& fsLabel, bool untrusted) {
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fsType.clear();
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fsUuid.clear();
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fsLabel.clear();
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std::string cmd(StringPrintf("%s -c /dev/null %s", kBlkidPath, path.c_str()));
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if (setexeccon(untrusted ? sBlkidUntrustedContext : sBlkidContext)) {
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LOG(ERROR) << "Failed to setexeccon()";
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return -EPERM;
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}
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FILE* fp = popen(cmd.c_str(), "r");
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if (setexeccon(NULL)) {
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abort();
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}
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if (!fp) {
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PLOG(ERROR) << "Failed to run " << cmd;
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return -errno;
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}
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status_t res = OK;
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char line[1024];
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char value[128];
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if (fgets(line, sizeof(line), fp) != nullptr) {
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LOG(DEBUG) << "blkid identified " << path << " as " << line;
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// Extract values from blkid output, if defined
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char* start = strstr(line, "TYPE=");
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if (start != nullptr && sscanf(start + 5, "\"%127[^\"]\"", value) == 1) {
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fsType = value;
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}
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start = strstr(line, "UUID=");
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if (start != nullptr && sscanf(start + 5, "\"%127[^\"]\"", value) == 1) {
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fsUuid = value;
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}
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start = strstr(line, "LABEL=");
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if (start != nullptr && sscanf(start + 6, "\"%127[^\"]\"", value) == 1) {
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fsLabel = value;
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}
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} else {
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LOG(WARNING) << "blkid failed to identify " << path;
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res = -ENODATA;
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}
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pclose(fp);
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return res;
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}
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status_t ReadMetadata(const std::string& path, std::string& fsType,
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std::string& fsUuid, std::string& fsLabel) {
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return readMetadata(path, fsType, fsUuid, fsLabel, false);
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}
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status_t ReadMetadataUntrusted(const std::string& path, std::string& fsType,
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std::string& fsUuid, std::string& fsLabel) {
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return readMetadata(path, fsType, fsUuid, fsLabel, true);
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}
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status_t ForkExecvp(const std::vector<std::string>& args, int* status,
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bool ignore_int_quit, bool logwrap) {
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int argc = args.size();
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char** argv = (char**) calloc(argc, sizeof(char*));
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for (int i = 0; i < argc; i++) {
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argv[i] = (char*) args[i].c_str();
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if (i == 0) {
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LOG(VERBOSE) << args[i];
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} else {
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LOG(VERBOSE) << " " << args[i];
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}
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}
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int res = android_fork_execvp(argc, argv, status, ignore_int_quit, logwrap);
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free(argv);
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return res;
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}
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status_t ReadRandomBytes(size_t bytes, std::string& out) {
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out.clear();
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int fd = TEMP_FAILURE_RETRY(open("/dev/urandom", O_RDONLY | O_CLOEXEC | O_NOFOLLOW));
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if (fd == -1) {
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return -errno;
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}
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char buf[BUFSIZ];
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size_t n;
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while ((n = TEMP_FAILURE_RETRY(read(fd, &buf[0], std::min(sizeof(buf), bytes)))) > 0) {
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out.append(buf, n);
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bytes -= n;
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}
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TEMP_FAILURE_RETRY(close(fd));
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if (bytes == 0) {
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return OK;
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} else {
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return -EIO;
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}
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}
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status_t HexToStr(const std::string& hex, std::string& str) {
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str.clear();
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bool even = true;
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char cur = 0;
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for (size_t i = 0; i < hex.size(); i++) {
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int val = 0;
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switch (hex[i]) {
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case ' ': case '-': case ':': continue;
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case 'f': case 'F': val = 15; break;
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case 'e': case 'E': val = 14; break;
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case 'd': case 'D': val = 13; break;
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case 'c': case 'C': val = 12; break;
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case 'b': case 'B': val = 11; break;
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case 'a': case 'A': val = 10; break;
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case '9': val = 9; break;
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case '8': val = 8; break;
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case '7': val = 7; break;
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case '6': val = 6; break;
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case '5': val = 5; break;
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case '4': val = 4; break;
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case '3': val = 3; break;
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case '2': val = 2; break;
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case '1': val = 1; break;
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case '0': val = 0; break;
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default: return -EINVAL;
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}
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if (even) {
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cur = val << 4;
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} else {
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cur += val;
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str.push_back(cur);
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cur = 0;
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}
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even = !even;
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}
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return even ? OK : -EINVAL;
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}
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static const char* kLookup = "0123456789abcdef";
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status_t StrToHex(const std::string& str, std::string& hex) {
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hex.clear();
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for (size_t i = 0; i < str.size(); i++) {
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hex.push_back(kLookup[str[i] >> 4]);
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hex.push_back(kLookup[str[i] & 0x0F]);
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}
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return OK;
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}
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} // namespace vold
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} // namespace android
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