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llvm-project/lldb/source/Host/freebsd/Host.cpp

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//===-- source/Host/freebsd/Host.cpp ------------------------------*- C++
//-*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// C Includes
#include <sys/types.h>
#include <sys/exec.h>
#include <sys/proc.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <machine/elf.h>
#include <dlfcn.h>
#include <execinfo.h>
#include <stdio.h>
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Target/Platform.h"
#include "lldb/Target/Process.h"
#include "lldb/Utility/Endian.h"
#include "lldb/Utility/Error.h"
#include "lldb/Utility/StreamString.h"
#include "lldb/Core/DataBufferHeap.h"
#include "lldb/Core/DataExtractor.h"
#include "lldb/Utility/CleanUp.h"
#include "lldb/Utility/NameMatches.h"
#include "llvm/Support/Host.h"
extern "C" {
extern char **environ;
}
using namespace lldb;
using namespace lldb_private;
size_t Host::GetEnvironment(StringList &env) {
char *v;
char **var = environ;
for (; var != NULL && *var != NULL; ++var) {
v = strchr(*var, (int)'-');
if (v == NULL)
continue;
env.AppendString(v);
}
return env.GetSize();
}
static bool
GetFreeBSDProcessArgs(const ProcessInstanceInfoMatch *match_info_ptr,
ProcessInstanceInfo &process_info) {
if (process_info.ProcessIDIsValid()) {
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_ARGS,
(int)process_info.GetProcessID()};
char arg_data[8192];
size_t arg_data_size = sizeof(arg_data);
if (::sysctl(mib, 4, arg_data, &arg_data_size, NULL, 0) == 0) {
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) {
process_info.GetExecutableFile().SetFile(cstr, false);
if (!(match_info_ptr == NULL ||
NameMatches(
process_info.GetExecutableFile().GetFilename().GetCString(),
match_info_ptr->GetNameMatchType(),
match_info_ptr->GetProcessInfo().GetName())))
return false;
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)
return true;
cstr = data.GetCStr(&offset);
if (cstr)
proc_args.AppendArgument(llvm::StringRef(cstr));
else
return true;
}
}
}
}
return false;
}
static bool GetFreeBSDProcessCPUType(ProcessInstanceInfo &process_info) {
if (process_info.ProcessIDIsValid()) {
process_info.GetArchitecture() =
HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
return true;
}
process_info.GetArchitecture().Clear();
return false;
}
static bool GetFreeBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) {
struct kinfo_proc proc_kinfo;
size_t proc_kinfo_size;
if (process_info.ProcessIDIsValid()) {
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID,
(int)process_info.GetProcessID()};
proc_kinfo_size = sizeof(struct kinfo_proc);
if (::sysctl(mib, 4, &proc_kinfo, &proc_kinfo_size, NULL, 0) == 0) {
if (proc_kinfo_size > 0) {
process_info.SetParentProcessID(proc_kinfo.ki_ppid);
process_info.SetUserID(proc_kinfo.ki_ruid);
process_info.SetGroupID(proc_kinfo.ki_rgid);
process_info.SetEffectiveUserID(proc_kinfo.ki_uid);
if (proc_kinfo.ki_ngroups > 0)
process_info.SetEffectiveGroupID(proc_kinfo.ki_groups[0]);
else
process_info.SetEffectiveGroupID(UINT32_MAX);
return true;
}
}
}
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::FindProcesses(const ProcessInstanceInfoMatch &match_info,
ProcessInstanceInfoList &process_infos) {
std::vector<struct kinfo_proc> kinfos;
int mib[3] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL};
size_t pid_data_size = 0;
if (::sysctl(mib, 3, NULL, &pid_data_size, NULL, 0) != 0)
return 0;
// Add a few extra in case a few more show up
const size_t estimated_pid_count =
(pid_data_size / sizeof(struct kinfo_proc)) + 10;
kinfos.resize(estimated_pid_count);
pid_data_size = kinfos.size() * sizeof(struct kinfo_proc);
if (::sysctl(mib, 3, &kinfos[0], &pid_data_size, NULL, 0) != 0)
return 0;
const size_t actual_pid_count = (pid_data_size / sizeof(struct kinfo_proc));
bool all_users = match_info.GetMatchAllUsers();
const ::pid_t our_pid = getpid();
const uid_t our_uid = getuid();
for (size_t i = 0; i < actual_pid_count; i++) {
const struct kinfo_proc &kinfo = kinfos[i];
const bool kinfo_user_matches = (all_users || (kinfo.ki_ruid == our_uid) ||
// Special case, if lldb is being run as
// root we can attach to anything.
(our_uid == 0));
if (kinfo_user_matches == false || // Make sure the user is acceptable
kinfo.ki_pid == our_pid || // Skip this process
kinfo.ki_pid == 0 || // Skip kernel (kernel pid is zero)
kinfo.ki_stat == SZOMB || // Zombies are bad, they like brains...
kinfo.ki_flag & P_TRACED || // Being debugged?
kinfo.ki_flag & P_WEXIT) // Working on exiting
continue;
// Every thread is a process in FreeBSD, 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.
bool already_registered = false;
for (uint32_t pi = 0;
!already_registered && (const int)kinfo.ki_numthreads > 1 &&
pi < (const uint32_t)process_infos.GetSize();
pi++)
already_registered =
(process_infos.GetProcessIDAtIndex(pi) == (uint32_t)kinfo.ki_pid);
if (already_registered)
continue;
ProcessInstanceInfo process_info;
process_info.SetProcessID(kinfo.ki_pid);
process_info.SetParentProcessID(kinfo.ki_ppid);
process_info.SetUserID(kinfo.ki_ruid);
process_info.SetGroupID(kinfo.ki_rgid);
process_info.SetEffectiveUserID(kinfo.ki_svuid);
process_info.SetEffectiveGroupID(kinfo.ki_svgid);
// Make sure our info matches before we go fetch the name and cpu type
if (match_info.Matches(process_info) &&
GetFreeBSDProcessArgs(&match_info, process_info)) {
GetFreeBSDProcessCPUType(process_info);
if (match_info.Matches(process_info))
process_infos.Append(process_info);
}
}
return process_infos.GetSize();
}
bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
process_info.SetProcessID(pid);
if (GetFreeBSDProcessArgs(NULL, process_info)) {
// should use libprocstat instead of going right into sysctl?
GetFreeBSDProcessCPUType(process_info);
GetFreeBSDProcessUserAndGroup(process_info);
return true;
}
process_info.Clear();
return false;
}
lldb::DataBufferSP Host::GetAuxvData(lldb_private::Process *process) {
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_AUXV, 0};
size_t auxv_size = AT_COUNT * sizeof(Elf_Auxinfo);
DataBufferSP buf_sp;
std::unique_ptr<DataBufferHeap> buf_ap(new DataBufferHeap(auxv_size, 0));
mib[3] = process->GetID();
if (::sysctl(mib, 4, buf_ap->GetBytes(), &auxv_size, NULL, 0) == 0) {
buf_sp.reset(buf_ap.release());
} else {
perror("sysctl failed on auxv");
}
return buf_sp;
}
Error Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
return Error("unimplemented");
}
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