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/*
* Copyright (C) 2015 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 RWX
#include "adb_io.h"
#include <unistd.h>
#if !ADB_HOST
#include <sys/socket.h>
#include <sys/un.h>
#endif
#include <thread>
#include <android-base/stringprintf.h>
#include "adb.h"
#include "adb_trace.h"
#include "adb_utils.h"
#include "sysdeps.h"
bool SendProtocolString(int fd, std::string_view s) {
unsigned int length = s.size();
if (length > MAX_PAYLOAD - 4) {
errno = EMSGSIZE;
return false;
}
// The cost of sending two strings outweighs the cost of formatting.
// "adb sync" performance is affected by this.
auto str = android::base::StringPrintf("%04x", length).append(s);
return WriteFdExactly(fd, str);
}
bool ReadProtocolString(int fd, std::string* s, std::string* error) {
char buf[5];
if (!ReadFdExactly(fd, buf, 4)) {
*error = perror_str("protocol fault (couldn't read status length)");
return false;
}
buf[4] = 0;
unsigned long len = strtoul(buf, nullptr, 16);
s->resize(len, '\0');
if (!ReadFdExactly(fd, &(*s)[0], len)) {
*error = perror_str("protocol fault (couldn't read status message)");
return false;
}
return true;
}
bool SendOkay(int fd) {
return WriteFdExactly(fd, "OKAY", 4);
}
bool SendFail(int fd, std::string_view reason) {
return WriteFdExactly(fd, "FAIL", 4) && SendProtocolString(fd, reason);
}
bool ReadFdExactly(int fd, void* buf, size_t len) {
char* p = reinterpret_cast<char*>(buf);
size_t len0 = len;
D("readx: fd=%d wanted=%zu", fd, len);
while (len > 0) {
int r = adb_read(fd, p, len);
if (r > 0) {
len -= r;
p += r;
} else if (r == -1) {
D("readx: fd=%d error %d: %s", fd, errno, strerror(errno));
return false;
} else {
D("readx: fd=%d disconnected", fd);
errno = 0;
return false;
}
}
VLOG(RWX) << "readx: fd=" << fd << " wanted=" << len0 << " got=" << (len0 - len)
<< " " << dump_hex(reinterpret_cast<const unsigned char*>(buf), len0);
return true;
}
bool WriteFdExactly(int fd, const void* buf, size_t len) {
const char* p = reinterpret_cast<const char*>(buf);
int r;
VLOG(RWX) << "writex: fd=" << fd << " len=" << len
<< " " << dump_hex(reinterpret_cast<const unsigned char*>(buf), len);
while (len > 0) {
r = adb_write(fd, p, len);
if (r == -1) {
D("writex: fd=%d error %d: %s", fd, errno, strerror(errno));
if (errno == EAGAIN) {
std::this_thread::yield();
continue;
} else if (errno == EPIPE) {
D("writex: fd=%d disconnected", fd);
errno = 0;
return false;
} else {
return false;
}
} else {
len -= r;
p += r;
}
}
return true;
}
bool WriteFdExactly(int fd, const char* str) {
return WriteFdExactly(fd, str, strlen(str));
}
bool WriteFdExactly(int fd, const std::string& str) {
return WriteFdExactly(fd, str.c_str(), str.size());
}
bool WriteFdFmt(int fd, const char* fmt, ...) {
std::string str;
va_list ap;
va_start(ap, fmt);
android::base::StringAppendV(&str, fmt, ap);
va_end(ap);
return WriteFdExactly(fd, str);
}
bool ReadOrderlyShutdown(int fd) {
char buf[16];
// Only call this function if you're sure that the peer does
// orderly/graceful shutdown of the socket, closing the socket so that
// adb_read() will return 0. If the peer keeps the socket open, adb_read()
// will never return.
int result = adb_read(fd, buf, sizeof(buf));
if (result == -1) {
// If errno is EAGAIN, that means this function was called on a
// nonblocking socket and it would have blocked (which would be bad
// because we'd probably block the main thread where nonblocking IO is
// done). Don't do that. If you have a nonblocking socket, use the
// fdevent APIs to get called on FDE_READ, and then call this function
// if you really need to, but it shouldn't be needed for server sockets.
CHECK_NE(errno, EAGAIN);
// Note that on Windows, orderly shutdown sometimes causes
// recv() == SOCKET_ERROR && WSAGetLastError() == WSAECONNRESET. That
// can be ignored.
return false;
} else if (result == 0) {
// Peer has performed an orderly/graceful shutdown.
return true;
} else {
// Unexpectedly received data. This is essentially a protocol error
// because you should not call this function unless you expect no more
// data. We don't repeatedly call adb_read() until we get zero because
// we don't know how long that would take, but we do know that the
// caller wants to close the socket soon.
VLOG(RWX) << "ReadOrderlyShutdown(" << fd << ") unexpectedly read "
<< dump_hex(buf, result);
// Shutdown the socket to prevent the caller from reading or writing to
// it which doesn't make sense if we just read and discarded some data.
adb_shutdown(fd);
errno = EINVAL;
return false;
}
}
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