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#include "usb_transport_sniffer.h"
#include <android-base/stringprintf.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <iomanip>
#include <sstream>
namespace fastboot {
UsbTransportSniffer::UsbTransportSniffer(std::unique_ptr<UsbTransport> transport,
const int serial_fd)
: transport_(std::move(transport)), serial_fd_(serial_fd) {}
UsbTransportSniffer::~UsbTransportSniffer() {
Close();
}
ssize_t UsbTransportSniffer::Read(void* data, size_t len) {
ProcessSerial();
ssize_t ret = transport_->Read(data, len);
if (ret < 0) {
const char* err = strerror(errno);
std::vector<char> buf(err, err + strlen(err));
Event e(READ_ERROR, std::move(buf));
transfers_.push_back(e);
return ret;
}
char* cdata = static_cast<char*>(data);
std::vector<char> buf(cdata, cdata + ret);
Event e(READ, std::move(buf));
transfers_.push_back(e);
ProcessSerial();
return ret;
}
ssize_t UsbTransportSniffer::Write(const void* data, size_t len) {
ProcessSerial();
size_t ret = transport_->Write(data, len);
if (ret != len) {
const char* err = strerror(errno);
std::vector<char> buf(err, err + strlen(err));
Event e(WRITE_ERROR, std::move(buf));
transfers_.push_back(e);
return ret;
}
const char* cdata = static_cast<const char*>(data);
std::vector<char> buf(cdata, cdata + len);
Event e(WRITE, std::move(buf));
transfers_.push_back(e);
ProcessSerial();
return ret;
}
int UsbTransportSniffer::Close() {
return transport_->Close();
}
int UsbTransportSniffer::Reset() {
ProcessSerial();
int ret = transport_->Reset();
std::vector<char> buf;
Event e(RESET, std::move(buf));
transfers_.push_back(e);
ProcessSerial();
return ret;
}
const std::vector<UsbTransportSniffer::Event> UsbTransportSniffer::Transfers() {
return transfers_;
}
/*
* When a test fails, we want a human readable log of everything going on up until
* the failure. This method will look through its log of captured events, and
* create a clean printable string of everything that happened.
*/
std::string UsbTransportSniffer::CreateTrace() {
std::string ret;
const auto no_print = [](char c) -> bool { return !isprint(c); };
// This lambda creates a humand readable representation of a byte buffer
// It first attempts to figure out whether it should be interpreted as an ASCII buffer,
// and be printed as a string, or just a raw byte-buffer
const auto msg = [&ret, no_print](const std::vector<char>& buf) {
ret += android::base::StringPrintf("(%lu bytes): ", buf.size());
std::vector<const char>::iterator iter = buf.end();
const unsigned max_chars = 50;
if (buf.size() > max_chars) {
iter = buf.begin() + max_chars;
}
ret += '"';
if (std::count_if(buf.begin(), iter, no_print) == 0) { // print as ascii
ret.insert(ret.end(), buf.begin(), iter);
} else { // print as hex
std::stringstream ss;
for (auto c = buf.begin(); c < iter; c++) {
ss << std::hex << std::setw(2) << std::setfill('0')
<< static_cast<uint16_t>(static_cast<uint8_t>(*c));
ss << ',';
}
ret += ss.str();
}
if (buf.size() > max_chars) {
ret += android::base::StringPrintf("...\"(+%lu bytes)\n", buf.size() - max_chars);
} else {
ret += "\"\n";
}
};
// Now we just scan through the log of everything that happened and create a
// printable string for each one
for (const auto& event : transfers_) {
const std::vector<char>& cbuf = event.buf;
const std::string tmp(cbuf.begin(), cbuf.end());
auto start = transfers_.front().start;
auto durr = event.start - start;
auto millis = std::chrono::duration_cast<std::chrono::milliseconds>(durr).count();
switch (event.type) {
case READ:
ret += android::base::StringPrintf("[READ %lldms]", millis);
msg(cbuf);
break;
case WRITE:
ret += android::base::StringPrintf("[WRITE %lldms]", millis);
msg(cbuf);
break;
case RESET:
ret += android::base::StringPrintf("[RESET %lldms]\n", millis);
break;
case READ_ERROR:
ret += android::base::StringPrintf("[READ_ERROR %lldms] %s\n", millis, tmp.c_str());
break;
case WRITE_ERROR:
ret += android::base::StringPrintf("[WRITE_ERROR %lldms] %s\n", millis,
tmp.c_str());
break;
case SERIAL:
ret += android::base::StringPrintf("[SERIAL %lldms] %s", millis, tmp.c_str());
if (ret.back() != '\n') ret += '\n';
break;
}
}
return ret;
}
// This is a quick call to flush any UART logs the device might have sent
// to our internal event log. It will wait up to 10ms for data to appear
void UsbTransportSniffer::ProcessSerial() {
if (serial_fd_ <= 0) return;
fd_set set;
struct timeval timeout;
FD_ZERO(&set);
FD_SET(serial_fd_, &set);
timeout.tv_sec = 0;
timeout.tv_usec = 10000; // 10ms
int count = 0;
int n = 0;
std::vector<char> buf;
buf.resize(1000);
while (select(serial_fd_ + 1, &set, NULL, NULL, &timeout) > 0) {
n = read(serial_fd_, buf.data() + count, buf.size() - count);
if (n > 0) {
count += n;
} else {
break;
}
}
buf.resize(count);
if (count > 0) {
Event e(SERIAL, std::move(buf));
transfers_.push_back(e);
}
}
} // namespace fastboot
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