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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define TRACE_TAG TRANSPORT
#include <memory>
#include "sysdeps.h"
#include "transport.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "adb.h"
#if ADB_HOST
#if defined(__APPLE__)
#define CHECK_PACKET_OVERFLOW 0
#else
#define CHECK_PACKET_OVERFLOW 1
#endif
// Call usb_read using a buffer having a multiple of usb_get_max_packet_size() bytes
// to avoid overflow. See http://libusb.sourceforge.net/api-1.0/packetoverflow.html.
static int UsbReadMessage(usb_handle* h, amessage* msg) {
D("UsbReadMessage");
#if CHECK_PACKET_OVERFLOW
size_t usb_packet_size = usb_get_max_packet_size(h);
CHECK_GE(usb_packet_size, sizeof(*msg));
CHECK_LT(usb_packet_size, 4096ULL);
char buffer[4096];
int n = usb_read(h, buffer, usb_packet_size);
if (n != sizeof(*msg)) {
D("usb_read returned unexpected length %d (expected %zu)", n, sizeof(*msg));
return -1;
}
memcpy(msg, buffer, sizeof(*msg));
return n;
#else
return usb_read(h, msg, sizeof(*msg));
#endif
}
// Call usb_read using a buffer having a multiple of usb_get_max_packet_size() bytes
// to avoid overflow. See http://libusb.sourceforge.net/api-1.0/packetoverflow.html.
static int UsbReadPayload(usb_handle* h, apacket* p) {
D("UsbReadPayload(%d)", p->msg.data_length);
if (p->msg.data_length > MAX_PAYLOAD) {
return -1;
}
#if CHECK_PACKET_OVERFLOW
size_t usb_packet_size = usb_get_max_packet_size(h);
// Round the data length up to the nearest packet size boundary.
// The device won't send a zero packet for packet size aligned payloads,
// so don't read any more packets than needed.
size_t len = p->msg.data_length;
size_t rem_size = len % usb_packet_size;
if (rem_size) {
len += usb_packet_size - rem_size;
}
p->payload.resize(len);
int rc = usb_read(h, &p->payload[0], p->payload.size());
if (rc != static_cast<int>(p->msg.data_length)) {
return -1;
}
p->payload.resize(rc);
return rc;
#else
p->payload.resize(p->msg.data_length);
return usb_read(h, &p->payload[0], p->payload.size());
#endif
}
static int remote_read(apacket* p, usb_handle* usb) {
int n = UsbReadMessage(usb, &p->msg);
if (n < 0) {
D("remote usb: read terminated (message)");
return -1;
}
if (static_cast<size_t>(n) != sizeof(p->msg)) {
D("remote usb: read received unexpected header length %d", n);
return -1;
}
if (p->msg.data_length) {
n = UsbReadPayload(usb, p);
if (n < 0) {
D("remote usb: terminated (data)");
return -1;
}
if (static_cast<uint32_t>(n) != p->msg.data_length) {
D("remote usb: read payload failed (need %u bytes, give %d bytes), skip it",
p->msg.data_length, n);
return -1;
}
}
return 0;
}
#else
// On Android devices, we rely on the kernel to provide buffered read.
// So we can recover automatically from EOVERFLOW.
static int remote_read(apacket* p, usb_handle* usb) {
if (usb_read(usb, &p->msg, sizeof(amessage)) != sizeof(amessage)) {
PLOG(ERROR) << "remote usb: read terminated (message)";
return -1;
}
if (p->msg.data_length) {
if (p->msg.data_length > MAX_PAYLOAD) {
PLOG(ERROR) << "remote usb: read overflow (data length = " << p->msg.data_length << ")";
return -1;
}
p->payload.resize(p->msg.data_length);
if (usb_read(usb, &p->payload[0], p->payload.size())
!= static_cast<int>(p->payload.size())) {
PLOG(ERROR) << "remote usb: terminated (data)";
return -1;
}
}
return 0;
}
#endif
UsbConnection::~UsbConnection() {
usb_close(handle_);
}
bool UsbConnection::Read(apacket* packet) {
int rc = remote_read(packet, handle_);
return rc == 0;
}
bool UsbConnection::Write(apacket* packet) {
int size = packet->msg.data_length;
if (usb_write(handle_, &packet->msg, sizeof(packet->msg)) != sizeof(packet->msg)) {
PLOG(ERROR) << "remote usb: 1 - write terminated";
return false;
}
if (packet->msg.data_length != 0 && usb_write(handle_, packet->payload.data(), size) != size) {
PLOG(ERROR) << "remote usb: 2 - write terminated";
return false;
}
return true;
}
void UsbConnection::Reset() {
usb_reset(handle_);
usb_kick(handle_);
}
void UsbConnection::Close() {
usb_kick(handle_);
}
void init_usb_transport(atransport* t, usb_handle* h) {
D("transport: usb");
auto connection = std::make_unique<UsbConnection>(h);
t->SetConnection(std::make_unique<BlockingConnectionAdapter>(std::move(connection)));
t->type = kTransportUsb;
t->SetUsbHandle(h);
}
int is_adb_interface(int usb_class, int usb_subclass, int usb_protocol) {
return (usb_class == ADB_CLASS && usb_subclass == ADB_SUBCLASS && usb_protocol == ADB_PROTOCOL);
}
bool should_use_libusb() {
#if !ADB_HOST
return false;
#else
static bool enable = getenv("ADB_LIBUSB") && strcmp(getenv("ADB_LIBUSB"), "1") == 0;
return enable;
#endif
}
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