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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include "opentelemetry/resource_detectors/detail/process_detector_utils.h"
#include <fstream>
#include <string>
#include <vector>
#ifdef _MSC_VER
// clang-format off
# include <windows.h>
# include <psapi.h>
# include <shellapi.h>
# pragma comment(lib, "shell32.lib")
// clang-format on
#else
# include <sys/types.h>
# include <unistd.h>
# include <cstdio>
#endif
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace resource_detector
{
namespace detail
{
constexpr const char *kExecutableName = "exe";
constexpr const char *kCmdlineName = "cmdline";
std::string GetExecutablePath(const int32_t &pid)
{
#ifdef _MSC_VER
HANDLE hProcess =
OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, static_cast<DWORD>(pid));
if (!hProcess)
{
return std::string();
}
WCHAR wbuffer[MAX_PATH];
DWORD len = GetProcessImageFileNameW(hProcess, wbuffer, MAX_PATH);
CloseHandle(hProcess);
if (len == 0)
{
return std::string();
}
// Convert UTF-16 to UTF-8
int size_needed = WideCharToMultiByte(CP_UTF8, 0, wbuffer, len, NULL, 0, NULL, NULL);
std::string utf8_path(size_needed, 0);
WideCharToMultiByte(CP_UTF8, 0, wbuffer, len, &utf8_path[0], size_needed, NULL, NULL);
return utf8_path;
#else
std::string path = FormFilePath(pid, kExecutableName);
char buffer[4096];
ssize_t len = readlink(path.c_str(), buffer, sizeof(buffer) - 1);
if (len != -1)
{
buffer[len] = '\0';
return std::string(buffer);
}
return std::string();
#endif
}
std::vector<std::string> ExtractCommandWithArgs(const std::string &command_line_path)
{
std::vector<std::string> commands;
std::ifstream command_line_file(command_line_path, std::ios::in | std::ios::binary);
std::string command;
while (std::getline(command_line_file, command, '\0'))
{
if (!command.empty())
{
commands.push_back(command);
}
}
return commands;
}
std::vector<std::string> GetCommandWithArgs(const int32_t &pid)
{
#ifdef _MSC_VER
int argc = 0;
LPWSTR *argvW = CommandLineToArgvW(GetCommandLineW(), &argc);
if (!argvW)
{
return {}; // returns an empty vector if CommandLineToArgvW fails
}
std::vector<std::string> args;
for (int i = 0; i < argc; i++)
{
// Convert UTF-16 to UTF-8
int size_needed = WideCharToMultiByte(CP_UTF8, 0, argvW[i], -1, NULL, 0, NULL, NULL);
if (size_needed > 0)
{
std::string arg(size_needed - 1, 0);
WideCharToMultiByte(CP_UTF8, 0, argvW[i], -1, &arg[0], size_needed, NULL, NULL);
args.push_back(arg);
}
}
LocalFree(argvW);
return args;
#else
std::string command_line_path = FormFilePath(pid, kCmdlineName);
return ExtractCommandWithArgs(command_line_path);
#endif
}
std::string FormFilePath(const int32_t &pid, const char *process_type)
{
char buff[64];
int len = std::snprintf(buff, sizeof(buff), "/proc/%d/%s", pid, process_type);
if (len < 0)
{
// in case snprintf fails
return std::string();
}
if (len >= static_cast<int>(sizeof(buff)))
{
return std::string(buff, sizeof(buff) - 1);
}
return std::string(buff, len);
}
} // namespace detail
} // namespace resource_detector
OPENTELEMETRY_END_NAMESPACE
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