//===-- source/Host/netbsd/HostNetBSD.cpp ---------------------------------===//
//
// 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 <cstdio>
#include <dlfcn.h>
#include <execinfo.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <climits>
#include <kvm.h>
#include <sys/exec.h>
#include <sys/ptrace.h>
#include "lldb/Host/FileSystem.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Endian.h"
#include "lldb/Utility/LLDBLog.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/NameMatches.h"
#include "lldb/Utility/ProcessInfo.h"
#include "lldb/Utility/Status.h"
#include "lldb/Utility/StreamString.h"
#include "llvm/Object/ELF.h"
#include "llvm/TargetParser/Host.h"
extern "C" {
extern char **environ;
}
using namespace lldb;
using namespace lldb_private;
namespace lldb_private {
class ProcessLaunchInfo;
}
Environment Host::GetEnvironment() { return Environment(environ); }
static bool GetNetBSDProcessArgs(const ProcessInstanceInfoMatch *match_info_ptr,
ProcessInstanceInfo &process_info) {
if (!process_info.ProcessIDIsValid())
return false;
int pid = process_info.GetProcessID();
int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_ARGV};
char arg_data[8192];
size_t arg_data_size = sizeof(arg_data);
if (::sysctl(mib, 4, arg_data, &arg_data_size, NULL, 0) != 0)
return false;
DataExtractor data(arg_data, arg_data_size, endian::InlHostByteOrder(),
sizeof(void *));
lldb::offset_t offset = 0;
const char *cstr;
cstr = data.GetCStr(&offset);
if (!cstr)
return false;
process_info.GetExecutableFile().SetFile(cstr,
FileSpec::Style::native);
if (!(match_info_ptr == NULL ||
NameMatches(process_info.GetExecutableFile().GetFilename().GetCString(),
match_info_ptr->GetNameMatchType(),
match_info_ptr->GetProcessInfo().GetName())))
return false;
process_info.SetArg0(cstr);
Args &proc_args = process_info.GetArguments();
while (1) {
const uint8_t *p = data.PeekData(offset, 1);
while ((p != NULL) && (*p == '\0') && offset < arg_data_size) {
++offset;
p = data.PeekData(offset, 1);
}
if (p == NULL || offset >= arg_data_size)
break;
cstr = data.GetCStr(&offset);
if (!cstr)
break;
proc_args.AppendArgument(llvm::StringRef(cstr));
}
return true;
}
static bool GetNetBSDProcessCPUType(ProcessInstanceInfo &process_info) {
Log *log = GetLog(LLDBLog::Host);
if (process_info.ProcessIDIsValid()) {
auto buffer_sp = FileSystem::Instance().CreateDataBuffer(
process_info.GetExecutableFile(), 0x20, 0);
if (buffer_sp) {
uint8_t exe_class =
llvm::object::getElfArchType(
{reinterpret_cast<const char *>(buffer_sp->GetBytes()),
size_t(buffer_sp->GetByteSize())})
.first;
switch (exe_class) {
case llvm::ELF::ELFCLASS32:
process_info.GetArchitecture() =
HostInfo::GetArchitecture(HostInfo::eArchKind32);
return true;
case llvm::ELF::ELFCLASS64:
process_info.GetArchitecture() =
HostInfo::GetArchitecture(HostInfo::eArchKind64);
return true;
default:
LLDB_LOG(log, "Unknown elf class ({0}) in file {1}", exe_class,
process_info.GetExecutableFile());
}
}
}
process_info.GetArchitecture().Clear();
return false;
}
static bool GetNetBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) {
::kvm_t *kdp;
char errbuf[_POSIX2_LINE_MAX]; /* XXX: error string unused */
struct ::kinfo_proc2 *proc_kinfo;
const int pid = process_info.GetProcessID();
int nproc;
if (!process_info.ProcessIDIsValid())
goto error;
if ((kdp = ::kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf)) == NULL)
goto error;
if ((proc_kinfo = ::kvm_getproc2(kdp, KERN_PROC_PID, pid,
sizeof(struct ::kinfo_proc2), &nproc)) ==
NULL) {
::kvm_close(kdp);
goto error;
}
if (nproc < 1) {
::kvm_close(kdp); /* XXX: we don't check for error here */
goto error;
}
process_info.SetParentProcessID(proc_kinfo->p_ppid);
process_info.SetUserID(proc_kinfo->p_ruid);
process_info.SetGroupID(proc_kinfo->p_rgid);
process_info.SetEffectiveUserID(proc_kinfo->p_uid);
process_info.SetEffectiveGroupID(proc_kinfo->p_gid);
::kvm_close(kdp); /* XXX: we don't check for error here */
return true;
error:
process_info.SetParentProcessID(LLDB_INVALID_PROCESS_ID);
process_info.SetUserID(UINT32_MAX);
process_info.SetGroupID(UINT32_MAX);
process_info.SetEffectiveUserID(UINT32_MAX);
process_info.SetEffectiveGroupID(UINT32_MAX);
return false;
}
uint32_t Host::FindProcessesImpl(const ProcessInstanceInfoMatch &match_info,
ProcessInstanceInfoList &process_infos) {
const ::pid_t our_pid = ::getpid();
const ::uid_t our_uid = ::getuid();
const bool all_users =
match_info.GetMatchAllUsers() ||
// Special case, if lldb is being run as root we can attach to anything
(our_uid == 0);
kvm_t *kdp;
char errbuf[_POSIX2_LINE_MAX]; /* XXX: error string unused */
if ((kdp = ::kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf)) == NULL)
return 0;
struct ::kinfo_proc2 *proc_kinfo;
int nproc;
if ((proc_kinfo = ::kvm_getproc2(kdp, KERN_PROC_ALL, 0,
sizeof(struct ::kinfo_proc2), &nproc)) ==
NULL) {
::kvm_close(kdp);
return 0;
}
ProcessInstanceInfoMatch match_info_noname{match_info};
match_info_noname.SetNameMatchType(NameMatch::Ignore);
for (int i = 0; i < nproc; i++) {
if (proc_kinfo[i].p_pid < 1)
continue; /* not valid */
/* Make sure the user is acceptable */
if (!all_users && proc_kinfo[i].p_ruid != our_uid)
continue;
if (proc_kinfo[i].p_pid == our_pid || // Skip this process
proc_kinfo[i].p_pid == 0 || // Skip kernel (kernel pid is 0)
proc_kinfo[i].p_stat == LSZOMB || // Zombies are bad
proc_kinfo[i].p_flag & P_TRACED || // Being debugged?
proc_kinfo[i].p_flag & P_WEXIT) // Working on exiting
continue;
// Every thread is a process in NetBSD, but all the threads of a single
// process have the same pid. Do not store the process info in the result
// list if a process with given identifier is already registered there.
if (proc_kinfo[i].p_nlwps > 1) {
bool already_registered = false;
for (size_t pi = 0; pi < process_infos.size(); pi++) {
if ((::pid_t)process_infos[pi].GetProcessID() == proc_kinfo[i].p_pid) {
already_registered = true;
break;
}
}
if (already_registered)
continue;
}
ProcessInstanceInfo process_info;
process_info.SetProcessID(proc_kinfo[i].p_pid);
process_info.SetParentProcessID(proc_kinfo[i].p_ppid);
process_info.SetUserID(proc_kinfo[i].p_ruid);
process_info.SetGroupID(proc_kinfo[i].p_rgid);
process_info.SetEffectiveUserID(proc_kinfo[i].p_uid);
process_info.SetEffectiveGroupID(proc_kinfo[i].p_gid);
// Make sure our info matches before we go fetch the name and cpu type
if (match_info_noname.Matches(process_info) &&
GetNetBSDProcessArgs(&match_info, process_info)) {
GetNetBSDProcessCPUType(process_info);
if (match_info.Matches(process_info))
process_infos.push_back(process_info);
}
}
kvm_close(kdp); /* XXX: we don't check for error here */
return process_infos.size();
}
bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
process_info.SetProcessID(pid);
if (GetNetBSDProcessArgs(NULL, process_info)) {
GetNetBSDProcessCPUType(process_info);
GetNetBSDProcessUserAndGroup(process_info);
return true;
}
process_info.Clear();
return false;
}
Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
return Status::FromErrorString("unimplemented");
}
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