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| //===-- HostInfoPosix.cpp ---------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/posix/HostInfoPosix.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/UserIDResolver.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <grp.h>
#include <limits.h>
#include <mutex>
#include <pwd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
using namespace lldb_private;
size_t HostInfoPosix::GetPageSize() { return ::getpagesize(); }
bool HostInfoPosix::GetHostname(std::string &s) {
char hostname[PATH_MAX];
hostname[sizeof(hostname) - 1] = '\0';
if (::gethostname(hostname, sizeof(hostname) - 1) == 0) {
s.assign(hostname);
return true;
}
return false;
}
#ifdef __ANDROID__
#include <android/api-level.h>
#endif
#if defined(__ANDROID_API__) && __ANDROID_API__ < 21
#define USE_GETPWUID
#endif
namespace {
class PosixUserIDResolver : public UserIDResolver {
protected:
llvm::Optional<std::string> DoGetUserName(id_t uid) override;
llvm::Optional<std::string> DoGetGroupName(id_t gid) override;
};
} // namespace
struct PasswdEntry {
std::string username;
std::string shell;
};
static llvm::Optional<PasswdEntry> GetPassword(id_t uid) {
#ifdef USE_GETPWUID
// getpwuid_r is missing from android-9
// The caller should provide some thread safety by making sure no one calls
// this function concurrently, because using getpwuid is ultimately not
// thread-safe as we don't know who else might be calling it.
if (auto *user_info_ptr = ::getpwuid(uid))
return PasswdEntry{user_info_ptr->pw_name, user_info_ptr->pw_shell};
#else
struct passwd user_info;
struct passwd *user_info_ptr = &user_info;
char user_buffer[PATH_MAX];
size_t user_buffer_size = sizeof(user_buffer);
if (::getpwuid_r(uid, &user_info, user_buffer, user_buffer_size,
&user_info_ptr) == 0 &&
user_info_ptr) {
return PasswdEntry{user_info_ptr->pw_name, user_info_ptr->pw_shell};
}
#endif
return llvm::None;
}
llvm::Optional<std::string> PosixUserIDResolver::DoGetUserName(id_t uid) {
if (llvm::Optional<PasswdEntry> password = GetPassword(uid))
return password->username;
return llvm::None;
}
llvm::Optional<std::string> PosixUserIDResolver::DoGetGroupName(id_t gid) {
#ifndef __ANDROID__
char group_buffer[PATH_MAX];
size_t group_buffer_size = sizeof(group_buffer);
struct group group_info;
struct group *group_info_ptr = &group_info;
// Try the threadsafe version first
if (::getgrgid_r(gid, &group_info, group_buffer, group_buffer_size,
&group_info_ptr) == 0) {
if (group_info_ptr)
return std::string(group_info_ptr->gr_name);
} else {
// The threadsafe version isn't currently working for me on darwin, but the
// non-threadsafe version is, so I am calling it below.
group_info_ptr = ::getgrgid(gid);
if (group_info_ptr)
return std::string(group_info_ptr->gr_name);
}
#endif
return llvm::None;
}
static llvm::ManagedStatic<PosixUserIDResolver> g_user_id_resolver;
UserIDResolver &HostInfoPosix::GetUserIDResolver() {
return *g_user_id_resolver;
}
uint32_t HostInfoPosix::GetUserID() { return getuid(); }
uint32_t HostInfoPosix::GetGroupID() { return getgid(); }
uint32_t HostInfoPosix::GetEffectiveUserID() { return geteuid(); }
uint32_t HostInfoPosix::GetEffectiveGroupID() { return getegid(); }
FileSpec HostInfoPosix::GetDefaultShell() {
if (const char *v = ::getenv("SHELL"))
return FileSpec(v);
if (llvm::Optional<PasswdEntry> password = GetPassword(::geteuid()))
return FileSpec(password->shell);
return FileSpec("/bin/sh");
}
bool HostInfoPosix::ComputeSupportExeDirectory(FileSpec &file_spec) {
return ComputePathRelativeToLibrary(file_spec, "/bin");
}
bool HostInfoPosix::ComputeHeaderDirectory(FileSpec &file_spec) {
FileSpec temp_file("/opt/local/include/lldb");
file_spec.GetDirectory().SetCString(temp_file.GetPath().c_str());
return true;
}
bool HostInfoPosix::GetEnvironmentVar(const std::string &var_name,
std::string &var) {
if (const char *pvar = ::getenv(var_name.c_str())) {
var = std::string(pvar);
return true;
}
return false;
}
|