fastboot/fastboot_driver.cpp - LeafOS-Project/android_system_core - Gitiles

 /*
  * Copyright (C) 2018 The Android Open Source Project
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */

 #include "fastboot_driver.h"

 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <algorithm>
 #include <chrono>
 #include <fstream>
 #include <memory>
 #include <regex>
 #include <vector>

 #include <android-base/file.h>
 #include <android-base/mapped_file.h>
 #include <android-base/parseint.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <android-base/unique_fd.h>
 #include <storage_literals/storage_literals.h>

 #include "constants.h"
 #include "transport.h"

 using android::base::StringPrintf;
 using namespace android::storage_literals;

 namespace fastboot {

 /*************************** PUBLIC *******************************/
 FastBootDriver::FastBootDriver(Transport* transport, DriverCallbacks driver_callbacks,
                                bool no_checks)
     : transport_(transport),
       prolog_(std::move(driver_callbacks.prolog)),
       epilog_(std::move(driver_callbacks.epilog)),
       info_(std::move(driver_callbacks.info)),
       text_(std::move(driver_callbacks.text)),
       disable_checks_(no_checks) {}

 FastBootDriver::~FastBootDriver() {
 }

 RetCode FastBootDriver::Boot(std::string* response, std::vector<std::string>* info) {
     return RawCommand(FB_CMD_BOOT, "Booting", response, info);
 }

 RetCode FastBootDriver::Continue(std::string* response, std::vector<std::string>* info) {
     return RawCommand(FB_CMD_CONTINUE, "Resuming boot", response, info);
 }

 RetCode FastBootDriver::CreatePartition(const std::string& partition, const std::string& size) {
     return RawCommand(FB_CMD_CREATE_PARTITION ":" + partition + ":" + size,
                       "Creating '" + partition + "'");
 }

 RetCode FastBootDriver::DeletePartition(const std::string& partition) {
     return RawCommand(FB_CMD_DELETE_PARTITION ":" + partition, "Deleting '" + partition + "'");
 }

 RetCode FastBootDriver::Erase(const std::string& partition, std::string* response,
                               std::vector<std::string>* info) {
     return RawCommand(FB_CMD_ERASE ":" + partition, "Erasing '" + partition + "'", response, info);
 }

 RetCode FastBootDriver::Flash(const std::string& partition, std::string* response,
                               std::vector<std::string>* info) {
     return RawCommand(FB_CMD_FLASH ":" + partition, "Writing '" + partition + "'", response, info);
 }

 RetCode FastBootDriver::GetVar(const std::string& key, std::string* val,
                                std::vector<std::string>* info) {
     return RawCommand(FB_CMD_GETVAR ":" + key, val, info);
 }

 RetCode FastBootDriver::GetVarAll(std::vector<std::string>* response) {
     std::string tmp;
     return GetVar("all", &tmp, response);
 }

 RetCode FastBootDriver::Reboot(std::string* response, std::vector<std::string>* info) {
     return RawCommand(FB_CMD_REBOOT, "Rebooting", response, info);
 }

 RetCode FastBootDriver::RebootTo(std::string target, std::string* response,
                                  std::vector<std::string>* info) {
     return RawCommand("reboot-" + target, "Rebooting into " + target, response, info);
 }

 RetCode FastBootDriver::ResizePartition(const std::string& partition, const std::string& size) {
     return RawCommand(FB_CMD_RESIZE_PARTITION ":" + partition + ":" + size,
                       "Resizing '" + partition + "'");
 }

 RetCode FastBootDriver::SetActive(const std::string& slot, std::string* response,
                                   std::vector<std::string>* info) {
     return RawCommand(FB_CMD_SET_ACTIVE ":" + slot, "Setting current slot to '" + slot + "'",
                       response, info);
 }

 RetCode FastBootDriver::SnapshotUpdateCommand(const std::string& command, std::string* response,
                                               std::vector<std::string>* info) {
     prolog_(StringPrintf("Snapshot %s", command.c_str()));
     std::string raw = FB_CMD_SNAPSHOT_UPDATE ":" + command;
     auto result = RawCommand(raw, response, info);
     epilog_(result);
     return result;
 }

 RetCode FastBootDriver::FlashPartition(const std::string& partition,
                                        const std::vector<char>& data) {
     RetCode ret;
     if ((ret = Download(partition, data))) {
         return ret;
     }
     return Flash(partition);
 }

 RetCode FastBootDriver::FlashPartition(const std::string& partition, android::base::borrowed_fd fd,
                                        uint32_t size) {
     RetCode ret;
     if ((ret = Download(partition, fd, size))) {
         return ret;
     }
     return Flash(partition);
 }

 RetCode FastBootDriver::FlashPartition(const std::string& partition, sparse_file* s, uint32_t size,
                                        size_t current, size_t total) {
     RetCode ret;
     if ((ret = Download(partition, s, size, current, total, false))) {
         return ret;
     }
     return Flash(partition);
 }

 RetCode FastBootDriver::Partitions(std::vector<std::tuple<std::string, uint64_t>>* partitions) {
     std::vector<std::string> all;
     RetCode ret;
     if ((ret = GetVarAll(&all))) {
         return ret;
     }

     std::regex reg("partition-size[[:s:]]*:[[:s:]]*([[:w:]]+)[[:s:]]*:[[:s:]]*0x([[:xdigit:]]+)");
     std::smatch sm;

     for (auto& s : all) {
         if (std::regex_match(s, sm, reg)) {
             std::string m1(sm[1]);
             std::string m2(sm[2]);
             uint64_t tmp = strtoll(m2.c_str(), 0, 16);
             partitions->push_back(std::make_tuple(m1, tmp));
         }
     }
     return SUCCESS;
 }

 RetCode FastBootDriver::Download(const std::string& name, android::base::borrowed_fd fd,
                                  size_t size, std::string* response,
                                  std::vector<std::string>* info) {
     prolog_(StringPrintf("Sending '%s' (%zu KB)", name.c_str(), size / 1024));
     auto result = Download(fd, size, response, info);
     epilog_(result);
     return result;
 }

 RetCode FastBootDriver::Download(android::base::borrowed_fd fd, size_t size, std::string* response,
                                  std::vector<std::string>* info) {
     RetCode ret;

     if ((size <= 0 || size > MAX_DOWNLOAD_SIZE) && !disable_checks_) {
         error_ = "File is too large to download";
         return BAD_ARG;
     }

     uint32_t u32size = static_cast<uint32_t>(size);
     if ((ret = DownloadCommand(u32size, response, info))) {
         return ret;
     }

     // Write the buffer
     if ((ret = SendBuffer(fd, size))) {
         return ret;
     }

     // Wait for response
     return HandleResponse(response, info);
 }

 RetCode FastBootDriver::Download(const std::string& name, const std::vector<char>& buf,
                                  std::string* response, std::vector<std::string>* info) {
     prolog_(StringPrintf("Sending '%s' (%zu KB)", name.c_str(), buf.size() / 1024));
     auto result = Download(buf, response, info);
     epilog_(result);
     return result;
 }

 RetCode FastBootDriver::Download(const std::vector<char>& buf, std::string* response,
                                  std::vector<std::string>* info) {
     RetCode ret;
     error_ = "";
     if ((buf.size() == 0 || buf.size() > MAX_DOWNLOAD_SIZE) && !disable_checks_) {
         error_ = "Buffer is too large or 0 bytes";
         return BAD_ARG;
     }

     if ((ret = DownloadCommand(buf.size(), response, info))) {
         return ret;
     }

     // Write the buffer
     if ((ret = SendBuffer(buf))) {
         return ret;
     }

     // Wait for response
     return HandleResponse(response, info);
 }

 RetCode FastBootDriver::Download(const std::string& partition, struct sparse_file* s, uint32_t size,
                                  size_t current, size_t total, bool use_crc, std::string* response,
                                  std::vector<std::string>* info) {
     prolog_(StringPrintf("Sending sparse '%s' %zu/%zu (%u KB)", partition.c_str(), current, total,
                          size / 1024));
     auto result = Download(s, use_crc, response, info);
     epilog_(result);
     return result;
 }

 RetCode FastBootDriver::Download(sparse_file* s, bool use_crc, std::string* response,
                                  std::vector<std::string>* info) {
     error_ = "";
     int64_t size = sparse_file_len(s, true, use_crc);
     if (size <= 0 || size > MAX_DOWNLOAD_SIZE) {
         error_ = "Sparse file is too large or invalid";
         return BAD_ARG;
     }

     RetCode ret;
     uint32_t u32size = static_cast<uint32_t>(size);
     if ((ret = DownloadCommand(u32size, response, info))) {
         return ret;
     }

     struct SparseCBPrivate {
         FastBootDriver* self;
         std::vector<char> tpbuf;
     } cb_priv;
     cb_priv.self = this;

     auto cb = [](void* priv, const void* buf, size_t len) -> int {
         SparseCBPrivate* data = static_cast<SparseCBPrivate*>(priv);
         const char* cbuf = static_cast<const char*>(buf);
         return data->self->SparseWriteCallback(data->tpbuf, cbuf, len);
     };

     if (sparse_file_callback(s, true, use_crc, cb, &cb_priv) < 0) {
         error_ = "Error reading sparse file";
         return IO_ERROR;
     }

     // Now flush
     if (cb_priv.tpbuf.size() && (ret = SendBuffer(cb_priv.tpbuf))) {
         return ret;
     }

     return HandleResponse(response, info);
 }

 RetCode FastBootDriver::Upload(const std::string& outfile, std::string* response,
                                std::vector<std::string>* info) {
     prolog_("Uploading '" + outfile + "'");
     auto result = UploadInner(outfile, response, info);
     epilog_(result);
     return result;
 }

 // This function executes cmd, then expect a "DATA" response with a number N, followed
 // by N bytes, and another response.
 // This is the common way for the device to send data to the driver used by upload and fetch.
 RetCode FastBootDriver::RunAndReadBuffer(
         const std::string& cmd, std::string* response, std::vector<std::string>* info,
         const std::function<RetCode(const char* data, uint64_t size)>& write_fn) {
     RetCode ret;
     int dsize = 0;
     if ((ret = RawCommand(cmd, response, info, &dsize))) {
         error_ = android::base::StringPrintf("%s request failed: %s", cmd.c_str(), error_.c_str());
         return ret;
     }

     if (dsize <= 0) {
         error_ = android::base::StringPrintf("%s request failed, device reports %d bytes available",
                                              cmd.c_str(), dsize);
         return BAD_DEV_RESP;
     }

     const uint64_t total_size = dsize;
     const uint64_t buf_size = std::min<uint64_t>(total_size, 1_MiB);
     std::vector<char> data(buf_size);
     uint64_t current_offset = 0;
     while (current_offset < total_size) {
         uint64_t remaining = total_size - current_offset;
         uint64_t chunk_size = std::min(buf_size, remaining);
         if ((ret = ReadBuffer(data.data(), chunk_size)) != SUCCESS) {
             return ret;
         }
         if ((ret = write_fn(data.data(), chunk_size)) != SUCCESS) {
             return ret;
         }
         current_offset += chunk_size;
     }
     return HandleResponse(response, info);
 }

 RetCode FastBootDriver::UploadInner(const std::string& outfile, std::string* response,
                                     std::vector<std::string>* info) {
     std::ofstream ofs;
     ofs.open(outfile, std::ofstream::out | std::ofstream::binary);
     if (ofs.fail()) {
         error_ = android::base::StringPrintf("Failed to open '%s'", outfile.c_str());
         return IO_ERROR;
     }
     auto write_fn = [&](const char* data, uint64_t size) {
         ofs.write(data, size);
         if (ofs.fail() || ofs.bad()) {
             error_ = android::base::StringPrintf("Writing to '%s' failed", outfile.c_str());
             return IO_ERROR;
         }
         return SUCCESS;
     };
     RetCode ret = RunAndReadBuffer(FB_CMD_UPLOAD, response, info, write_fn);
     ofs.close();
     return ret;
 }

 RetCode FastBootDriver::FetchToFd(const std::string& partition, android::base::borrowed_fd fd,
                                   int64_t offset, int64_t size, std::string* response,
                                   std::vector<std::string>* info) {
     prolog_(android::base::StringPrintf("Fetching %s (offset=%" PRIx64 ", size=%" PRIx64 ")",
                                         partition.c_str(), offset, size));
     std::string cmd = FB_CMD_FETCH ":" + partition;
     if (offset >= 0) {
         cmd += android::base::StringPrintf(":0x%08" PRIx64, offset);
         if (size >= 0) {
             cmd += android::base::StringPrintf(":0x%08" PRIx64, size);
         }
     }
     RetCode ret = RunAndReadBuffer(cmd, response, info, [&](const char* data, uint64_t size) {
         if (!android::base::WriteFully(fd, data, size)) {
             error_ = android::base::StringPrintf("Cannot write: %s", strerror(errno));
             return IO_ERROR;
         }
         return SUCCESS;
     });
     epilog_(ret);
     return ret;
 }

 // Helpers
 void FastBootDriver::SetInfoCallback(std::function<void(const std::string&)> info) {
     info_ = info;
 }

 const std::string FastBootDriver::RCString(RetCode rc) {
     switch (rc) {
         case SUCCESS:
             return std::string("Success");

         case BAD_ARG:
             return std::string("Invalid Argument");

         case IO_ERROR:
             return std::string("I/O Error");

         case BAD_DEV_RESP:
             return std::string("Invalid Device Response");

         case DEVICE_FAIL:
             return std::string("Device Error");

         case TIMEOUT:
             return std::string("Timeout");

         default:
             return std::string("Unknown Error");
     }
 }

 std::string FastBootDriver::Error() {
     return error_;
 }

 RetCode FastBootDriver::WaitForDisconnect() {
     return transport_->WaitForDisconnect() ? IO_ERROR : SUCCESS;
 }

 /****************************** PROTECTED *************************************/
 RetCode FastBootDriver::RawCommand(const std::string& cmd, const std::string& message,
                                    std::string* response, std::vector<std::string>* info,
                                    int* dsize) {
     prolog_(message);
     auto result = RawCommand(cmd, response, info, dsize);
     epilog_(result);
     return result;
 }

 RetCode FastBootDriver::RawCommand(const std::string& cmd, std::string* response,
                                    std::vector<std::string>* info, int* dsize) {
     error_ = "";  // Clear any pending error
     if (cmd.size() > FB_COMMAND_SZ && !disable_checks_) {
         error_ = "Command length to RawCommand() is too long";
         return BAD_ARG;
     }

     if (transport_->Write(cmd.c_str(), cmd.size()) != static_cast<int>(cmd.size())) {
         error_ = ErrnoStr("Write to device failed");
         return IO_ERROR;
     }

     // Read the response
     return HandleResponse(response, info, dsize);
 }

 RetCode FastBootDriver::DownloadCommand(uint32_t size, std::string* response,
                                         std::vector<std::string>* info) {
     std::string cmd(android::base::StringPrintf("%s:%08" PRIx32, FB_CMD_DOWNLOAD, size));
     RetCode ret;
     if ((ret = RawCommand(cmd, response, info))) {
         return ret;
     }
     return SUCCESS;
 }

 RetCode FastBootDriver::HandleResponse(std::string* response, std::vector<std::string>* info,
                                        int* dsize) {
     char status[FB_RESPONSE_SZ + 1];
     auto start = std::chrono::steady_clock::now();

     auto set_response = [response](std::string s) {
         if (response) *response = std::move(s);
     };
     auto add_info = [info](std::string s) {
         if (info) info->push_back(std::move(s));
     };

     // erase response
     set_response("");
     while ((std::chrono::steady_clock::now() - start) < std::chrono::seconds(RESP_TIMEOUT)) {
         int r = transport_->Read(status, FB_RESPONSE_SZ);
         if (r < 0) {
             error_ = ErrnoStr("Status read failed");
             return IO_ERROR;
         }

         status[r] = '\0';  // Need the null terminator
         std::string input(status);
         if (android::base::StartsWith(input, "INFO")) {
             std::string tmp = input.substr(strlen("INFO"));
             info_(tmp);
             add_info(std::move(tmp));
             // We may receive one or more INFO packets during long operations,
             // e.g. flash/erase if they are back by slow media like NAND/NOR
             // flash. In that case, reset the timer since it's not a real
             // timeout.
             start = std::chrono::steady_clock::now();
         } else if (android::base::StartsWith(input, "OKAY")) {
             set_response(input.substr(strlen("OKAY")));
             return SUCCESS;
         } else if (android::base::StartsWith(input, "FAIL")) {
             error_ = android::base::StringPrintf("remote: '%s'", status + strlen("FAIL"));
             set_response(input.substr(strlen("FAIL")));
             return DEVICE_FAIL;
         } else if (android::base::StartsWith(input, "TEXT")) {
             text_(input.substr(strlen("TEXT")));
             // Reset timeout as many more TEXT may come
             start = std::chrono::steady_clock::now();
         } else if (android::base::StartsWith(input, "DATA")) {
             std::string tmp = input.substr(strlen("DATA"));
             uint32_t num = strtol(tmp.c_str(), 0, 16);
             if (num > MAX_DOWNLOAD_SIZE) {
                 error_ = android::base::StringPrintf("Data size too large (%d)", num);
                 return BAD_DEV_RESP;
             }
             if (dsize) *dsize = num;
             set_response(std::move(tmp));
             return SUCCESS;
         } else {
             error_ = android::base::StringPrintf("Device sent unknown status code: %s", status);
             return BAD_DEV_RESP;
         }

     }  // End of while loop

     return TIMEOUT;
 }

 std::string FastBootDriver::ErrnoStr(const std::string& msg) {
     return android::base::StringPrintf("%s (%s)", msg.c_str(), strerror(errno));
 }

 /******************************* PRIVATE **************************************/
 RetCode FastBootDriver::SendBuffer(android::base::borrowed_fd fd, size_t size) {
     static constexpr uint32_t MAX_MAP_SIZE = 512 * 1024 * 1024;
     off64_t offset = 0;
     uint32_t remaining = size;
     RetCode ret;

     while (remaining) {
         // Memory map the file
         size_t len = std::min(remaining, MAX_MAP_SIZE);
         auto mapping{android::base::MappedFile::FromFd(fd, offset, len, PROT_READ)};
         if (!mapping) {
             error_ = "Creating filemap failed";
             return IO_ERROR;
         }

         if ((ret = SendBuffer(mapping->data(), mapping->size()))) {
             return ret;
         }

         remaining -= len;
         offset += len;
     }

     return SUCCESS;
 }

 RetCode FastBootDriver::SendBuffer(const std::vector<char>& buf) {
     // Write the buffer
     return SendBuffer(buf.data(), buf.size());
 }

 RetCode FastBootDriver::SendBuffer(const void* buf, size_t size) {
     // ioctl on 0-length buffer causes freezing
     if (!size) {
         return BAD_ARG;
     }
     // Write the buffer
     ssize_t tmp = transport_->Write(buf, size);

     if (tmp < 0) {
         error_ = ErrnoStr("Write to device failed in SendBuffer()");
         return IO_ERROR;
     } else if (static_cast<size_t>(tmp) != size) {
         error_ = android::base::StringPrintf("Failed to write all %zu bytes", size);

         return IO_ERROR;
     }

     return SUCCESS;
 }

 RetCode FastBootDriver::ReadBuffer(void* buf, size_t size) {
     // Read the buffer
     ssize_t tmp = transport_->Read(buf, size);

     if (tmp < 0) {
         error_ = ErrnoStr("Read from device failed in ReadBuffer()");
         return IO_ERROR;
     } else if (static_cast<size_t>(tmp) != size) {
         error_ = android::base::StringPrintf("Failed to read all %zu bytes", size);
         return IO_ERROR;
     }

     return SUCCESS;
 }

 int FastBootDriver::SparseWriteCallback(std::vector<char>& tpbuf, const char* data, size_t len) {
     size_t total = 0;
     size_t to_write = std::min(TRANSPORT_CHUNK_SIZE - tpbuf.size(), len);

     // Handle the residual
     tpbuf.insert(tpbuf.end(), data, data + to_write);
     if (tpbuf.size() < TRANSPORT_CHUNK_SIZE) {  // Nothing enough to send rn
         return 0;
     }

     if (SendBuffer(tpbuf)) {
         error_ = ErrnoStr("Send failed in SparseWriteCallback()");
         return -1;
     }
     tpbuf.clear();
     total += to_write;

     // Now we need to send a multiple of chunk size
     size_t nchunks = (len - total) / TRANSPORT_CHUNK_SIZE;
     size_t nbytes = TRANSPORT_CHUNK_SIZE * nchunks;
     if (nbytes && SendBuffer(data + total, nbytes)) {  // Don't send a ZLP
         error_ = ErrnoStr("Send failed in SparseWriteCallback()");
         return -1;
     }
     total += nbytes;

     if (len - total > 0) {  // We have residual data to save for next time
         tpbuf.assign(data + total, data + len);
     }

     return 0;
 }

 Transport* FastBootDriver::set_transport(Transport* transport) {
     std::swap(transport_, transport);
     return transport;
 }

 }  // End namespace fastboot
	/*
	* Copyright (C) 2018 The Android Open Source Project
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
	* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
	* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
	* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
	* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/

	#include "fastboot_driver.h"

	#include <errno.h>
	#include <fcntl.h>
	#include <inttypes.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <algorithm>
	#include <chrono>
	#include <fstream>
	#include <memory>
	#include <regex>
	#include <vector>

	#include <android-base/file.h>
	#include <android-base/mapped_file.h>
	#include <android-base/parseint.h>
	#include <android-base/stringprintf.h>
	#include <android-base/strings.h>
	#include <android-base/unique_fd.h>
	#include <storage_literals/storage_literals.h>

	#include "constants.h"
	#include "transport.h"

	using android::base::StringPrintf;
	using namespace android::storage_literals;

	namespace fastboot {

	/************************* PUBLIC *****************************/
	FastBootDriver::FastBootDriver(Transport* transport, DriverCallbacks driver_callbacks,
	bool no_checks)
	: transport_(transport),
	prolog_(std::move(driver_callbacks.prolog)),
	epilog_(std::move(driver_callbacks.epilog)),
	info_(std::move(driver_callbacks.info)),
	text_(std::move(driver_callbacks.text)),
	disable_checks_(no_checks) {}

	FastBootDriver::~FastBootDriver() {
	}

	RetCode FastBootDriver::Boot(std::string* response, std::vector<std::string>* info) {
	return RawCommand(FB_CMD_BOOT, "Booting", response, info);
	}

	RetCode FastBootDriver::Continue(std::string* response, std::vector<std::string>* info) {
	return RawCommand(FB_CMD_CONTINUE, "Resuming boot", response, info);
	}

	RetCode FastBootDriver::CreatePartition(const std::string& partition, const std::string& size) {
	return RawCommand(FB_CMD_CREATE_PARTITION ":" + partition + ":" + size,
	"Creating '" + partition + "'");
	}

	RetCode FastBootDriver::DeletePartition(const std::string& partition) {
	return RawCommand(FB_CMD_DELETE_PARTITION ":" + partition, "Deleting '" + partition + "'");
	}

	RetCode FastBootDriver::Erase(const std::string& partition, std::string* response,
	std::vector<std::string>* info) {
	return RawCommand(FB_CMD_ERASE ":" + partition, "Erasing '" + partition + "'", response, info);
	}

	RetCode FastBootDriver::Flash(const std::string& partition, std::string* response,
	std::vector<std::string>* info) {
	return RawCommand(FB_CMD_FLASH ":" + partition, "Writing '" + partition + "'", response, info);
	}

	RetCode FastBootDriver::GetVar(const std::string& key, std::string* val,
	std::vector<std::string>* info) {
	return RawCommand(FB_CMD_GETVAR ":" + key, val, info);
	}

	RetCode FastBootDriver::GetVarAll(std::vector<std::string>* response) {
	std::string tmp;
	return GetVar("all", &tmp, response);
	}

	RetCode FastBootDriver::Reboot(std::string* response, std::vector<std::string>* info) {
	return RawCommand(FB_CMD_REBOOT, "Rebooting", response, info);
	}

	RetCode FastBootDriver::RebootTo(std::string target, std::string* response,
	std::vector<std::string>* info) {
	return RawCommand("reboot-" + target, "Rebooting into " + target, response, info);
	}

	RetCode FastBootDriver::ResizePartition(const std::string& partition, const std::string& size) {
	return RawCommand(FB_CMD_RESIZE_PARTITION ":" + partition + ":" + size,
	"Resizing '" + partition + "'");
	}

	RetCode FastBootDriver::SetActive(const std::string& slot, std::string* response,
	std::vector<std::string>* info) {
	return RawCommand(FB_CMD_SET_ACTIVE ":" + slot, "Setting current slot to '" + slot + "'",
	response, info);
	}

	RetCode FastBootDriver::SnapshotUpdateCommand(const std::string& command, std::string* response,
	std::vector<std::string>* info) {
	prolog_(StringPrintf("Snapshot %s", command.c_str()));
	std::string raw = FB_CMD_SNAPSHOT_UPDATE ":" + command;
	auto result = RawCommand(raw, response, info);
	epilog_(result);
	return result;
	}

	RetCode FastBootDriver::FlashPartition(const std::string& partition,
	const std::vector<char>& data) {
	RetCode ret;
	if ((ret = Download(partition, data))) {
	return ret;
	}
	return Flash(partition);
	}

	RetCode FastBootDriver::FlashPartition(const std::string& partition, android::base::borrowed_fd fd,
	uint32_t size) {
	RetCode ret;
	if ((ret = Download(partition, fd, size))) {
	return ret;
	}
	return Flash(partition);
	}

	RetCode FastBootDriver::FlashPartition(const std::string& partition, sparse_file* s, uint32_t size,
	size_t current, size_t total) {
	RetCode ret;
	if ((ret = Download(partition, s, size, current, total, false))) {
	return ret;
	}
	return Flash(partition);
	}

	RetCode FastBootDriver::Partitions(std::vector<std::tuple<std::string, uint64_t>>* partitions) {
	std::vector<std::string> all;
	RetCode ret;
	if ((ret = GetVarAll(&all))) {
	return ret;
	}

	std::regex reg("partition-size[[:s:]]:[[:s:]]([[:w:]]+)[[:s:]]:[[:s:]]0x([[:xdigit:]]+)");
	std::smatch sm;

	for (auto& s : all) {
	if (std::regex_match(s, sm, reg)) {
	std::string m1(sm[1]);
	std::string m2(sm[2]);
	uint64_t tmp = strtoll(m2.c_str(), 0, 16);
	partitions->push_back(std::make_tuple(m1, tmp));
	}
	}
	return SUCCESS;
	}

	RetCode FastBootDriver::Download(const std::string& name, android::base::borrowed_fd fd,
	size_t size, std::string* response,
	std::vector<std::string>* info) {
	prolog_(StringPrintf("Sending '%s' (%zu KB)", name.c_str(), size / 1024));
	auto result = Download(fd, size, response, info);
	epilog_(result);
	return result;
	}

	RetCode FastBootDriver::Download(android::base::borrowed_fd fd, size_t size, std::string* response,
	std::vector<std::string>* info) {
	RetCode ret;

	if ((size <= 0 \|\| size > MAX_DOWNLOAD_SIZE) && !disable_checks_) {
	error_ = "File is too large to download";
	return BAD_ARG;
	}

	uint32_t u32size = static_cast<uint32_t>(size);
	if ((ret = DownloadCommand(u32size, response, info))) {
	return ret;
	}

	// Write the buffer
	if ((ret = SendBuffer(fd, size))) {
	return ret;
	}

	// Wait for response
	return HandleResponse(response, info);
	}

	RetCode FastBootDriver::Download(const std::string& name, const std::vector<char>& buf,
	std::string* response, std::vector<std::string>* info) {
	prolog_(StringPrintf("Sending '%s' (%zu KB)", name.c_str(), buf.size() / 1024));
	auto result = Download(buf, response, info);
	epilog_(result);
	return result;
	}

	RetCode FastBootDriver::Download(const std::vector<char>& buf, std::string* response,
	std::vector<std::string>* info) {
	RetCode ret;
	error_ = "";
	if ((buf.size() == 0 \|\| buf.size() > MAX_DOWNLOAD_SIZE) && !disable_checks_) {
	error_ = "Buffer is too large or 0 bytes";
	return BAD_ARG;
	}

	if ((ret = DownloadCommand(buf.size(), response, info))) {
	return ret;
	}

	// Write the buffer
	if ((ret = SendBuffer(buf))) {
	return ret;
	}

	// Wait for response
	return HandleResponse(response, info);
	}

	RetCode FastBootDriver::Download(const std::string& partition, struct sparse_file* s, uint32_t size,
	size_t current, size_t total, bool use_crc, std::string* response,
	std::vector<std::string>* info) {
	prolog_(StringPrintf("Sending sparse '%s' %zu/%zu (%u KB)", partition.c_str(), current, total,
	size / 1024));
	auto result = Download(s, use_crc, response, info);
	epilog_(result);
	return result;
	}

	RetCode FastBootDriver::Download(sparse_file* s, bool use_crc, std::string* response,
	std::vector<std::string>* info) {
	error_ = "";
	int64_t size = sparse_file_len(s, true, use_crc);
	if (size <= 0 \|\| size > MAX_DOWNLOAD_SIZE) {
	error_ = "Sparse file is too large or invalid";
	return BAD_ARG;
	}

	RetCode ret;
	uint32_t u32size = static_cast<uint32_t>(size);
	if ((ret = DownloadCommand(u32size, response, info))) {
	return ret;
	}

	struct SparseCBPrivate {
	FastBootDriver* self;
	std::vector<char> tpbuf;
	} cb_priv;
	cb_priv.self = this;

	auto cb = [](void* priv, const void* buf, size_t len) -> int {
	SparseCBPrivate* data = static_cast<SparseCBPrivate*>(priv);
	const char* cbuf = static_cast<const char*>(buf);
	return data->self->SparseWriteCallback(data->tpbuf, cbuf, len);
	};

	if (sparse_file_callback(s, true, use_crc, cb, &cb_priv) < 0) {
	error_ = "Error reading sparse file";
	return IO_ERROR;
	}

	// Now flush
	if (cb_priv.tpbuf.size() && (ret = SendBuffer(cb_priv.tpbuf))) {
	return ret;
	}

	return HandleResponse(response, info);
	}

	RetCode FastBootDriver::Upload(const std::string& outfile, std::string* response,
	std::vector<std::string>* info) {
	prolog_("Uploading '" + outfile + "'");
	auto result = UploadInner(outfile, response, info);
	epilog_(result);
	return result;
	}

	// This function executes cmd, then expect a "DATA" response with a number N, followed
	// by N bytes, and another response.
	// This is the common way for the device to send data to the driver used by upload and fetch.
	RetCode FastBootDriver::RunAndReadBuffer(
	const std::string& cmd, std::string* response, std::vector<std::string>* info,
	const std::function<RetCode(const char* data, uint64_t size)>& write_fn) {
	RetCode ret;
	int dsize = 0;
	if ((ret = RawCommand(cmd, response, info, &dsize))) {
	error_ = android::base::StringPrintf("%s request failed: %s", cmd.c_str(), error_.c_str());
	return ret;
	}

	if (dsize <= 0) {
	error_ = android::base::StringPrintf("%s request failed, device reports %d bytes available",
	cmd.c_str(), dsize);
	return BAD_DEV_RESP;
	}

	const uint64_t total_size = dsize;
	const uint64_t buf_size = std::min<uint64_t>(total_size, 1_MiB);
	std::vector<char> data(buf_size);
	uint64_t current_offset = 0;
	while (current_offset < total_size) {
	uint64_t remaining = total_size - current_offset;
	uint64_t chunk_size = std::min(buf_size, remaining);
	if ((ret = ReadBuffer(data.data(), chunk_size)) != SUCCESS) {
	return ret;
	}
	if ((ret = write_fn(data.data(), chunk_size)) != SUCCESS) {
	return ret;
	}
	current_offset += chunk_size;
	}
	return HandleResponse(response, info);
	}

	RetCode FastBootDriver::UploadInner(const std::string& outfile, std::string* response,
	std::vector<std::string>* info) {
	std::ofstream ofs;
	ofs.open(outfile, std::ofstream::out \| std::ofstream::binary);
	if (ofs.fail()) {
	error_ = android::base::StringPrintf("Failed to open '%s'", outfile.c_str());
	return IO_ERROR;
	}
	auto write_fn = [&](const char* data, uint64_t size) {
	ofs.write(data, size);
	if (ofs.fail() \|\| ofs.bad()) {
	error_ = android::base::StringPrintf("Writing to '%s' failed", outfile.c_str());
	return IO_ERROR;
	}
	return SUCCESS;
	};
	RetCode ret = RunAndReadBuffer(FB_CMD_UPLOAD, response, info, write_fn);
	ofs.close();
	return ret;
	}

	RetCode FastBootDriver::FetchToFd(const std::string& partition, android::base::borrowed_fd fd,
	int64_t offset, int64_t size, std::string* response,
	std::vector<std::string>* info) {
	prolog_(android::base::StringPrintf("Fetching %s (offset=%" PRIx64 ", size=%" PRIx64 ")",
	partition.c_str(), offset, size));
	std::string cmd = FB_CMD_FETCH ":" + partition;
	if (offset >= 0) {
	cmd += android::base::StringPrintf(":0x%08" PRIx64, offset);
	if (size >= 0) {
	cmd += android::base::StringPrintf(":0x%08" PRIx64, size);
	}
	}
	RetCode ret = RunAndReadBuffer(cmd, response, info, [&](const char* data, uint64_t size) {
	if (!android::base::WriteFully(fd, data, size)) {
	error_ = android::base::StringPrintf("Cannot write: %s", strerror(errno));
	return IO_ERROR;
	}
	return SUCCESS;
	});
	epilog_(ret);
	return ret;
	}

	// Helpers
	void FastBootDriver::SetInfoCallback(std::function<void(const std::string&)> info) {
	info_ = info;
	}

	const std::string FastBootDriver::RCString(RetCode rc) {
	switch (rc) {
	case SUCCESS:
	return std::string("Success");

	case BAD_ARG:
	return std::string("Invalid Argument");

	case IO_ERROR:
	return std::string("I/O Error");

	case BAD_DEV_RESP:
	return std::string("Invalid Device Response");

	case DEVICE_FAIL:
	return std::string("Device Error");

	case TIMEOUT:
	return std::string("Timeout");

	default:
	return std::string("Unknown Error");
	}
	}

	std::string FastBootDriver::Error() {
	return error_;
	}

	RetCode FastBootDriver::WaitForDisconnect() {
	return transport_->WaitForDisconnect() ? IO_ERROR : SUCCESS;
	}

	/**************************** PROTECTED ***********************************/
	RetCode FastBootDriver::RawCommand(const std::string& cmd, const std::string& message,
	std::string* response, std::vector<std::string>* info,
	int* dsize) {
	prolog_(message);
	auto result = RawCommand(cmd, response, info, dsize);
	epilog_(result);
	return result;
	}

	RetCode FastBootDriver::RawCommand(const std::string& cmd, std::string* response,
	std::vector<std::string>* info, int* dsize) {
	error_ = ""; // Clear any pending error
	if (cmd.size() > FB_COMMAND_SZ && !disable_checks_) {
	error_ = "Command length to RawCommand() is too long";
	return BAD_ARG;
	}

	if (transport_->Write(cmd.c_str(), cmd.size()) != static_cast<int>(cmd.size())) {
	error_ = ErrnoStr("Write to device failed");
	return IO_ERROR;
	}

	// Read the response
	return HandleResponse(response, info, dsize);
	}

	RetCode FastBootDriver::DownloadCommand(uint32_t size, std::string* response,
	std::vector<std::string>* info) {
	std::string cmd(android::base::StringPrintf("%s:%08" PRIx32, FB_CMD_DOWNLOAD, size));
	RetCode ret;
	if ((ret = RawCommand(cmd, response, info))) {
	return ret;
	}
	return SUCCESS;
	}

	RetCode FastBootDriver::HandleResponse(std::string* response, std::vector<std::string>* info,
	int* dsize) {
	char status[FB_RESPONSE_SZ + 1];
	auto start = std::chrono::steady_clock::now();

	auto set_response = [response](std::string s) {
	if (response) *response = std::move(s);
	};
	auto add_info = [info](std::string s) {
	if (info) info->push_back(std::move(s));
	};

	// erase response
	set_response("");
	while ((std::chrono::steady_clock::now() - start) < std::chrono::seconds(RESP_TIMEOUT)) {
	int r = transport_->Read(status, FB_RESPONSE_SZ);
	if (r < 0) {
	error_ = ErrnoStr("Status read failed");
	return IO_ERROR;
	}

	status[r] = '\0'; // Need the null terminator
	std::string input(status);
	if (android::base::StartsWith(input, "INFO")) {
	std::string tmp = input.substr(strlen("INFO"));
	info_(tmp);
	add_info(std::move(tmp));
	// We may receive one or more INFO packets during long operations,
	// e.g. flash/erase if they are back by slow media like NAND/NOR
	// flash. In that case, reset the timer since it's not a real
	// timeout.
	start = std::chrono::steady_clock::now();
	} else if (android::base::StartsWith(input, "OKAY")) {
	set_response(input.substr(strlen("OKAY")));
	return SUCCESS;
	} else if (android::base::StartsWith(input, "FAIL")) {
	error_ = android::base::StringPrintf("remote: '%s'", status + strlen("FAIL"));
	set_response(input.substr(strlen("FAIL")));
	return DEVICE_FAIL;
	} else if (android::base::StartsWith(input, "TEXT")) {
	text_(input.substr(strlen("TEXT")));
	// Reset timeout as many more TEXT may come
	start = std::chrono::steady_clock::now();
	} else if (android::base::StartsWith(input, "DATA")) {
	std::string tmp = input.substr(strlen("DATA"));
	uint32_t num = strtol(tmp.c_str(), 0, 16);
	if (num > MAX_DOWNLOAD_SIZE) {
	error_ = android::base::StringPrintf("Data size too large (%d)", num);
	return BAD_DEV_RESP;
	}
	if (dsize) *dsize = num;
	set_response(std::move(tmp));
	return SUCCESS;
	} else {
	error_ = android::base::StringPrintf("Device sent unknown status code: %s", status);
	return BAD_DEV_RESP;
	}

	} // End of while loop

	return TIMEOUT;
	}

	std::string FastBootDriver::ErrnoStr(const std::string& msg) {
	return android::base::StringPrintf("%s (%s)", msg.c_str(), strerror(errno));
	}

	/***************************** PRIVATE ************************************/
	RetCode FastBootDriver::SendBuffer(android::base::borrowed_fd fd, size_t size) {
	static constexpr uint32_t MAX_MAP_SIZE = 512 * 1024 * 1024;
	off64_t offset = 0;
	uint32_t remaining = size;
	RetCode ret;

	while (remaining) {
	// Memory map the file
	size_t len = std::min(remaining, MAX_MAP_SIZE);
	auto mapping{android::base::MappedFile::FromFd(fd, offset, len, PROT_READ)};
	if (!mapping) {
	error_ = "Creating filemap failed";
	return IO_ERROR;
	}

	if ((ret = SendBuffer(mapping->data(), mapping->size()))) {
	return ret;
	}

	remaining -= len;
	offset += len;
	}

	return SUCCESS;
	}

	RetCode FastBootDriver::SendBuffer(const std::vector<char>& buf) {
	// Write the buffer
	return SendBuffer(buf.data(), buf.size());
	}

	RetCode FastBootDriver::SendBuffer(const void* buf, size_t size) {
	// ioctl on 0-length buffer causes freezing
	if (!size) {
	return BAD_ARG;
	}
	// Write the buffer
	ssize_t tmp = transport_->Write(buf, size);

	if (tmp < 0) {
	error_ = ErrnoStr("Write to device failed in SendBuffer()");
	return IO_ERROR;
	} else if (static_cast<size_t>(tmp) != size) {
	error_ = android::base::StringPrintf("Failed to write all %zu bytes", size);

	return IO_ERROR;
	}

	return SUCCESS;
	}

	RetCode FastBootDriver::ReadBuffer(void* buf, size_t size) {
	// Read the buffer
	ssize_t tmp = transport_->Read(buf, size);

	if (tmp < 0) {
	error_ = ErrnoStr("Read from device failed in ReadBuffer()");
	return IO_ERROR;
	} else if (static_cast<size_t>(tmp) != size) {
	error_ = android::base::StringPrintf("Failed to read all %zu bytes", size);
	return IO_ERROR;
	}

	return SUCCESS;
	}

	int FastBootDriver::SparseWriteCallback(std::vector<char>& tpbuf, const char* data, size_t len) {
	size_t total = 0;
	size_t to_write = std::min(TRANSPORT_CHUNK_SIZE - tpbuf.size(), len);

	// Handle the residual
	tpbuf.insert(tpbuf.end(), data, data + to_write);
	if (tpbuf.size() < TRANSPORT_CHUNK_SIZE) { // Nothing enough to send rn
	return 0;
	}

	if (SendBuffer(tpbuf)) {
	error_ = ErrnoStr("Send failed in SparseWriteCallback()");
	return -1;
	}
	tpbuf.clear();
	total += to_write;

	// Now we need to send a multiple of chunk size
	size_t nchunks = (len - total) / TRANSPORT_CHUNK_SIZE;
	size_t nbytes = TRANSPORT_CHUNK_SIZE * nchunks;
	if (nbytes && SendBuffer(data + total, nbytes)) { // Don't send a ZLP
	error_ = ErrnoStr("Send failed in SparseWriteCallback()");
	return -1;
	}
	total += nbytes;

	if (len - total > 0) { // We have residual data to save for next time
	tpbuf.assign(data + total, data + len);
	}

	return 0;
	}

	Transport* FastBootDriver::set_transport(Transport* transport) {
	std::swap(transport_, transport);
	return transport;
	}

	} // End namespace fastboot