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//===-- source/Host/openbsd/Host.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 <sys/types.h>
#include <sys/signal.h>
#include <sys/exec.h>
#include <sys/proc.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <stdio.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/Log.h"
#include "lldb/Utility/NameMatches.h"
#include "lldb/Utility/ProcessInfo.h"
#include "lldb/Utility/Status.h"
#include "lldb/Utility/StreamString.h"
#include "llvm/Support/Host.h"
extern "C" {
extern char **environ;
}
using namespace lldb;
using namespace lldb_private;
namespace lldb_private {
class ProcessLaunchInfo;
}
Environment Host::GetEnvironment() {
Environment env;
char *v;
char **var = environ;
for (; var != NULL && *var != NULL; ++var) {
v = strchr(*var, (int)'-');
if (v == NULL)
continue;
env.insert(v);
}
return env;
}
static bool
GetOpenBSDProcessArgs(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, 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;
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 GetOpenBSDProcessCPUType(ProcessInstanceInfo &process_info) {
if (process_info.ProcessIDIsValid()) {
process_info.GetArchitecture() =
HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
return true;
}
process_info.GetArchitecture().Clear();
return false;
}
static bool GetOpenBSDProcessUserAndGroup(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.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);
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::FindProcessesImpl(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.p_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.p_pid == our_pid || // Skip this process
kinfo.p_pid == 0 || // Skip kernel (kernel pid is zero)
kinfo.p_stat == SZOMB || // Zombies are bad, they like brains...
kinfo.p_psflags & PS_TRACED || // Being debugged?
kinfo.p_flag & P_WEXIT) // Working on exiting
continue;
ProcessInstanceInfo process_info;
process_info.SetProcessID(kinfo.p_pid);
process_info.SetParentProcessID(kinfo.p_ppid);
process_info.SetUserID(kinfo.p_ruid);
process_info.SetGroupID(kinfo.p_rgid);
process_info.SetEffectiveUserID(kinfo.p_svuid);
process_info.SetEffectiveGroupID(kinfo.p_svgid);
// Make sure our info matches before we go fetch the name and cpu type
if (match_info.Matches(process_info) &&
GetOpenBSDProcessArgs(&match_info, process_info)) {
GetOpenBSDProcessCPUType(process_info);
if (match_info.Matches(process_info))
process_infos.push_back(process_info);
}
}
return process_infos.size();
}
bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
process_info.SetProcessID(pid);
if (GetOpenBSDProcessArgs(NULL, process_info)) {
// should use libprocstat instead of going right into sysctl?
GetOpenBSDProcessCPUType(process_info);
GetOpenBSDProcessUserAndGroup(process_info);
return true;
}
process_info.Clear();
return false;
}
Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
return Status("unimplemented");
}
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