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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 "sysdeps.h"
#include "transport.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "adb.h"
#if ADB_HOST
// 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");
size_t usb_packet_size = usb_get_max_packet_size(h);
CHECK(usb_packet_size >= sizeof(*msg));
CHECK(usb_packet_size < 4096);
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;
}
// 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);
size_t usb_packet_size = usb_get_max_packet_size(h);
CHECK(sizeof(p->data) % usb_packet_size == 0);
// 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;
}
CHECK(len <= sizeof(p->data));
return usb_read(h, &p->data, len);
}
static int remote_read(apacket* p, atransport* t) {
int n = UsbReadMessage(t->usb, &p->msg);
if (n < 0) {
D("remote usb: read terminated (message)");
return -1;
}
if (static_cast<size_t>(n) != sizeof(p->msg) || !check_header(p, t)) {
D("remote usb: check_header failed, skip it");
goto err_msg;
}
if (t->GetConnectionState() == kCsOffline) {
// If we read a wrong msg header declaring a large message payload, don't read its payload.
// Otherwise we may miss true messages from the device.
if (p->msg.command != A_CNXN && p->msg.command != A_AUTH) {
goto err_msg;
}
}
if (p->msg.data_length) {
n = UsbReadPayload(t->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);
goto err_msg;
}
}
if (!check_data(p)) {
D("remote usb: check_data failed, skip it");
goto err_msg;
}
return 0;
err_msg:
p->msg.command = 0;
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, atransport *t)
{
if (usb_read(t->usb, &p->msg, sizeof(amessage))) {
PLOG(ERROR) << "remote usb: read terminated (message)";
return -1;
}
if (!check_header(p, t)) {
LOG(ERROR) << "remote usb: check_header failed";
return -1;
}
if (p->msg.data_length) {
if (usb_read(t->usb, p->data, p->msg.data_length)) {
PLOG(ERROR) << "remote usb: terminated (data)";
return -1;
}
}
if (!check_data(p)) {
LOG(ERROR) << "remote usb: check_data failed";
return -1;
}
return 0;
}
#endif
static int remote_write(apacket *p, atransport *t)
{
unsigned size = p->msg.data_length;
if (usb_write(t->usb, &p->msg, sizeof(amessage))) {
PLOG(ERROR) << "remote usb: 1 - write terminated";
return -1;
}
if (p->msg.data_length == 0) return 0;
if (usb_write(t->usb, &p->data, size)) {
PLOG(ERROR) << "remote usb: 2 - write terminated";
return -1;
}
return 0;
}
static void remote_close(atransport* t) {
usb_close(t->usb);
t->usb = 0;
}
static void remote_kick(atransport* t) {
usb_kick(t->usb);
}
void init_usb_transport(atransport* t, usb_handle* h) {
D("transport: usb");
t->close = remote_close;
t->SetKickFunction(remote_kick);
t->SetWriteFunction(remote_write);
t->read_from_remote = remote_read;
t->sync_token = 1;
t->type = kTransportUsb;
t->usb = 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 defined(_WIN32) || !ADB_HOST
return false;
#else
static bool enable = getenv("ADB_LIBUSB") && strcmp(getenv("ADB_LIBUSB"), "1") == 0;
return enable;
#endif
}
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