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Yabin Cui8b309f62016-06-24 18:22:02 -07001/*
2 * Copyright (C) 2016 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 <bootloader_message/bootloader_message.h>
18
19#include <errno.h>
20#include <fcntl.h>
21#include <string.h>
22
23#include <string>
24#include <vector>
25
26#include <android-base/file.h>
27#include <android-base/properties.h>
28#include <android-base/stringprintf.h>
29#include <android-base/unique_fd.h>
30#include <fs_mgr.h>
31
Yabin Cui8b309f62016-06-24 18:22:02 -070032static std::string get_misc_blk_device(std::string* err) {
Bowgo Tsai4508f232017-03-27 17:47:21 +000033 std::unique_ptr<fstab, decltype(&fs_mgr_free_fstab)> fstab(fs_mgr_read_fstab_default(),
34 fs_mgr_free_fstab);
Bowgo Tsaid13b6cf2017-03-10 16:00:40 +080035 if (!fstab) {
36 *err = "failed to read default fstab";
Yabin Cui8b309f62016-06-24 18:22:02 -070037 return "";
38 }
Bowgo Tsaid13b6cf2017-03-10 16:00:40 +080039 fstab_rec* record = fs_mgr_get_entry_for_mount_point(fstab.get(), "/misc");
Yabin Cui8b309f62016-06-24 18:22:02 -070040 if (record == nullptr) {
41 *err = "failed to find /misc partition";
42 return "";
43 }
44 return record->blk_device;
45}
46
47// In recovery mode, recovery can get started and try to access the misc
48// device before the kernel has actually created it.
49static bool wait_for_device(const std::string& blk_device, std::string* err) {
50 int tries = 0;
51 int ret;
52 err->clear();
53 do {
54 ++tries;
55 struct stat buf;
56 ret = stat(blk_device.c_str(), &buf);
57 if (ret == -1) {
58 *err += android::base::StringPrintf("failed to stat %s try %d: %s\n",
59 blk_device.c_str(), tries, strerror(errno));
60 sleep(1);
61 }
62 } while (ret && tries < 10);
63
64 if (ret) {
65 *err += android::base::StringPrintf("failed to stat %s\n", blk_device.c_str());
66 }
67 return ret == 0;
68}
69
Tao Baobedf5fc2016-11-18 12:01:26 -080070static bool read_misc_partition(void* p, size_t size, const std::string& misc_blk_device,
71 size_t offset, std::string* err) {
Yabin Cui8b309f62016-06-24 18:22:02 -070072 if (!wait_for_device(misc_blk_device, err)) {
73 return false;
74 }
Yabin Cui0d5b8592016-07-06 11:47:23 -070075 android::base::unique_fd fd(open(misc_blk_device.c_str(), O_RDONLY));
Tao Baobedf5fc2016-11-18 12:01:26 -080076 if (fd == -1) {
Yabin Cui8b309f62016-06-24 18:22:02 -070077 *err = android::base::StringPrintf("failed to open %s: %s", misc_blk_device.c_str(),
78 strerror(errno));
79 return false;
80 }
Tao Baobedf5fc2016-11-18 12:01:26 -080081 if (lseek(fd, static_cast<off_t>(offset), SEEK_SET) != static_cast<off_t>(offset)) {
Yabin Cui8b309f62016-06-24 18:22:02 -070082 *err = android::base::StringPrintf("failed to lseek %s: %s", misc_blk_device.c_str(),
83 strerror(errno));
84 return false;
85 }
Tao Baobedf5fc2016-11-18 12:01:26 -080086 if (!android::base::ReadFully(fd, p, size)) {
Yabin Cui8b309f62016-06-24 18:22:02 -070087 *err = android::base::StringPrintf("failed to read %s: %s", misc_blk_device.c_str(),
88 strerror(errno));
89 return false;
90 }
91 return true;
92}
93
Tao Baobedf5fc2016-11-18 12:01:26 -080094static bool write_misc_partition(const void* p, size_t size, const std::string& misc_blk_device,
95 size_t offset, std::string* err) {
96 android::base::unique_fd fd(open(misc_blk_device.c_str(), O_WRONLY));
97 if (fd == -1) {
Yabin Cui8b309f62016-06-24 18:22:02 -070098 *err = android::base::StringPrintf("failed to open %s: %s", misc_blk_device.c_str(),
99 strerror(errno));
100 return false;
101 }
Tao Baobedf5fc2016-11-18 12:01:26 -0800102 if (lseek(fd, static_cast<off_t>(offset), SEEK_SET) != static_cast<off_t>(offset)) {
Yabin Cui8b309f62016-06-24 18:22:02 -0700103 *err = android::base::StringPrintf("failed to lseek %s: %s", misc_blk_device.c_str(),
104 strerror(errno));
105 return false;
106 }
Tao Baobedf5fc2016-11-18 12:01:26 -0800107 if (!android::base::WriteFully(fd, p, size)) {
Yabin Cui8b309f62016-06-24 18:22:02 -0700108 *err = android::base::StringPrintf("failed to write %s: %s", misc_blk_device.c_str(),
109 strerror(errno));
110 return false;
111 }
Tao Baobedf5fc2016-11-18 12:01:26 -0800112 if (fsync(fd) == -1) {
Yabin Cui8b309f62016-06-24 18:22:02 -0700113 *err = android::base::StringPrintf("failed to fsync %s: %s", misc_blk_device.c_str(),
114 strerror(errno));
115 return false;
116 }
117 return true;
118}
119
Tao Baobedf5fc2016-11-18 12:01:26 -0800120bool read_bootloader_message_from(bootloader_message* boot, const std::string& misc_blk_device,
121 std::string* err) {
122 return read_misc_partition(boot, sizeof(*boot), misc_blk_device,
123 BOOTLOADER_MESSAGE_OFFSET_IN_MISC, err);
124}
125
Yabin Cui8b309f62016-06-24 18:22:02 -0700126bool read_bootloader_message(bootloader_message* boot, std::string* err) {
Tao Baobedf5fc2016-11-18 12:01:26 -0800127 std::string misc_blk_device = get_misc_blk_device(err);
128 if (misc_blk_device.empty()) {
129 return false;
130 }
131 return read_bootloader_message_from(boot, misc_blk_device, err);
132}
133
134bool write_bootloader_message_to(const bootloader_message& boot, const std::string& misc_blk_device,
135 std::string* err) {
136 return write_misc_partition(&boot, sizeof(boot), misc_blk_device,
137 BOOTLOADER_MESSAGE_OFFSET_IN_MISC, err);
Yabin Cui8b309f62016-06-24 18:22:02 -0700138}
139
140bool write_bootloader_message(const bootloader_message& boot, std::string* err) {
Tao Baobedf5fc2016-11-18 12:01:26 -0800141 std::string misc_blk_device = get_misc_blk_device(err);
142 if (misc_blk_device.empty()) {
143 return false;
144 }
145 return write_bootloader_message_to(boot, misc_blk_device, err);
Yabin Cui8b309f62016-06-24 18:22:02 -0700146}
147
148bool clear_bootloader_message(std::string* err) {
149 bootloader_message boot = {};
150 return write_bootloader_message(boot, err);
151}
152
153bool write_bootloader_message(const std::vector<std::string>& options, std::string* err) {
Tao Bao26d5ae72016-12-13 01:06:24 +0000154 bootloader_message boot = {};
Yabin Cui8b309f62016-06-24 18:22:02 -0700155 strlcpy(boot.command, "boot-recovery", sizeof(boot.command));
156 strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery));
157 for (const auto& s : options) {
158 strlcat(boot.recovery, s.c_str(), sizeof(boot.recovery));
159 if (s.back() != '\n') {
160 strlcat(boot.recovery, "\n", sizeof(boot.recovery));
161 }
162 }
163 return write_bootloader_message(boot, err);
164}
165
Tao Bao2292db82016-12-13 21:53:31 -0800166bool update_bootloader_message(const std::vector<std::string>& options, std::string* err) {
167 bootloader_message boot;
168 if (!read_bootloader_message(&boot, err)) {
169 return false;
170 }
171
172 // Zero out the entire fields.
173 memset(boot.command, 0, sizeof(boot.command));
174 memset(boot.recovery, 0, sizeof(boot.recovery));
175
176 strlcpy(boot.command, "boot-recovery", sizeof(boot.command));
177 strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery));
178 for (const auto& s : options) {
179 strlcat(boot.recovery, s.c_str(), sizeof(boot.recovery));
180 if (s.back() != '\n') {
181 strlcat(boot.recovery, "\n", sizeof(boot.recovery));
182 }
183 }
184 return write_bootloader_message(boot, err);
185}
186
Vineela Tummalapallicba7fa82016-10-28 19:44:40 -0700187bool write_reboot_bootloader(std::string* err) {
188 bootloader_message boot;
189 if (!read_bootloader_message(&boot, err)) {
190 return false;
191 }
192 if (boot.command[0] != '\0') {
193 *err = "Bootloader command pending.";
194 return false;
195 }
196 strlcpy(boot.command, "bootonce-bootloader", sizeof(boot.command));
197 return write_bootloader_message(boot, err);
198}
199
Yabin Cui8b309f62016-06-24 18:22:02 -0700200bool read_wipe_package(std::string* package_data, size_t size, std::string* err) {
Tao Baobedf5fc2016-11-18 12:01:26 -0800201 std::string misc_blk_device = get_misc_blk_device(err);
202 if (misc_blk_device.empty()) {
203 return false;
204 }
Yabin Cui8b309f62016-06-24 18:22:02 -0700205 package_data->resize(size);
Tao Baobedf5fc2016-11-18 12:01:26 -0800206 return read_misc_partition(&(*package_data)[0], size, misc_blk_device,
207 WIPE_PACKAGE_OFFSET_IN_MISC, err);
Yabin Cui8b309f62016-06-24 18:22:02 -0700208}
209
210bool write_wipe_package(const std::string& package_data, std::string* err) {
Tao Baobedf5fc2016-11-18 12:01:26 -0800211 std::string misc_blk_device = get_misc_blk_device(err);
212 if (misc_blk_device.empty()) {
213 return false;
214 }
215 return write_misc_partition(package_data.data(), package_data.size(), misc_blk_device,
Yabin Cui8b309f62016-06-24 18:22:02 -0700216 WIPE_PACKAGE_OFFSET_IN_MISC, err);
217}
218
Vineela Tummalapallicba7fa82016-10-28 19:44:40 -0700219extern "C" bool write_reboot_bootloader(void) {
220 std::string err;
221 return write_reboot_bootloader(&err);
222}
223
Yabin Cui8b309f62016-06-24 18:22:02 -0700224extern "C" bool write_bootloader_message(const char* options) {
225 std::string err;
226 return write_bootloader_message({options}, &err);
227}