Host.cpp revision 341825 
1//===-- source/Host/netbsd/Host.cpp -----------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// C Includes
11#include <dlfcn.h>
12#include <execinfo.h>
13#include <stdio.h>
14#include <sys/proc.h>
15#include <sys/sysctl.h>
16#include <sys/types.h>
17
18#include <limits.h>
19
20#include <elf.h>
21#include <kvm.h>
22#include <sys/exec.h>
23#include <sys/ptrace.h>
24
25// C++ Includes
26// Other libraries and framework includes
27// Project includes
28#include "lldb/Host/Host.h"
29#include "lldb/Host/HostInfo.h"
30#include "lldb/Target/Process.h"
31#include "lldb/Utility/DataBufferHeap.h"
32#include "lldb/Utility/DataExtractor.h"
33#include "lldb/Utility/Endian.h"
34#include "lldb/Utility/Log.h"
35#include "lldb/Utility/NameMatches.h"
36#include "lldb/Utility/Status.h"
37#include "lldb/Utility/StreamString.h"
38
39#include "llvm/Support/Host.h"
40
41extern "C" {
42extern char **environ;
43}
44
45using namespace lldb;
46using namespace lldb_private;
47
48Environment Host::GetEnvironment() { return Environment(environ); }
49
50static bool GetNetBSDProcessArgs(const ProcessInstanceInfoMatch *match_info_ptr,
51                                 ProcessInstanceInfo &process_info) {
52  if (!process_info.ProcessIDIsValid())
53    return false;
54
55  int pid = process_info.GetProcessID();
56
57  int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_ARGV};
58
59  char arg_data[8192];
60  size_t arg_data_size = sizeof(arg_data);
61  if (::sysctl(mib, 4, arg_data, &arg_data_size, NULL, 0) != 0)
62    return false;
63
64  DataExtractor data(arg_data, arg_data_size, endian::InlHostByteOrder(),
65                     sizeof(void *));
66  lldb::offset_t offset = 0;
67  const char *cstr;
68
69  cstr = data.GetCStr(&offset);
70  if (!cstr)
71    return false;
72
73  process_info.GetExecutableFile().SetFile(cstr, false,
74                                           FileSpec::Style::native);
75
76  if (!(match_info_ptr == NULL ||
77        NameMatches(process_info.GetExecutableFile().GetFilename().GetCString(),
78                    match_info_ptr->GetNameMatchType(),
79                    match_info_ptr->GetProcessInfo().GetName())))
80    return false;
81
82  Args &proc_args = process_info.GetArguments();
83  while (1) {
84    const uint8_t *p = data.PeekData(offset, 1);
85    while ((p != NULL) && (*p == '\0') && offset < arg_data_size) {
86      ++offset;
87      p = data.PeekData(offset, 1);
88    }
89    if (p == NULL || offset >= arg_data_size)
90      break;
91
92    cstr = data.GetCStr(&offset);
93    if (!cstr)
94      break;
95
96    proc_args.AppendArgument(llvm::StringRef(cstr));
97  }
98
99  return true;
100}
101
102static bool GetNetBSDProcessCPUType(ProcessInstanceInfo &process_info) {
103  if (process_info.ProcessIDIsValid()) {
104    process_info.GetArchitecture() =
105        HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
106    return true;
107  }
108  process_info.GetArchitecture().Clear();
109  return false;
110}
111
112static bool GetNetBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) {
113  ::kvm_t *kdp;
114  char errbuf[_POSIX2_LINE_MAX]; /* XXX: error string unused */
115
116  struct ::kinfo_proc2 *proc_kinfo;
117  const int pid = process_info.GetProcessID();
118  int nproc;
119
120  if (!process_info.ProcessIDIsValid())
121    goto error;
122
123  if ((kdp = ::kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf)) == NULL)
124    goto error;
125
126  if ((proc_kinfo = ::kvm_getproc2(kdp, KERN_PROC_PID, pid,
127                                   sizeof(struct ::kinfo_proc2), &nproc)) ==
128      NULL) {
129    ::kvm_close(kdp);
130    goto error;
131  }
132
133  if (nproc < 1) {
134    ::kvm_close(kdp); /* XXX: we don't check for error here */
135    goto error;
136  }
137
138  process_info.SetParentProcessID(proc_kinfo->p_ppid);
139  process_info.SetUserID(proc_kinfo->p_ruid);
140  process_info.SetGroupID(proc_kinfo->p_rgid);
141  process_info.SetEffectiveUserID(proc_kinfo->p_uid);
142  process_info.SetEffectiveGroupID(proc_kinfo->p_gid);
143
144  ::kvm_close(kdp); /* XXX: we don't check for error here */
145
146  return true;
147
148error:
149  process_info.SetParentProcessID(LLDB_INVALID_PROCESS_ID);
150  process_info.SetUserID(UINT32_MAX);
151  process_info.SetGroupID(UINT32_MAX);
152  process_info.SetEffectiveUserID(UINT32_MAX);
153  process_info.SetEffectiveGroupID(UINT32_MAX);
154  return false;
155}
156
157uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
158                             ProcessInstanceInfoList &process_infos) {
159  const ::pid_t our_pid = ::getpid();
160  const ::uid_t our_uid = ::getuid();
161
162  const bool all_users =
163      match_info.GetMatchAllUsers() ||
164      // Special case, if lldb is being run as root we can attach to anything
165      (our_uid == 0);
166
167  kvm_t *kdp;
168  char errbuf[_POSIX2_LINE_MAX]; /* XXX: error string unused */
169  if ((kdp = ::kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf)) == NULL)
170    return 0;
171
172  struct ::kinfo_proc2 *proc_kinfo;
173  int nproc;
174  if ((proc_kinfo = ::kvm_getproc2(kdp, KERN_PROC_ALL, 0,
175                                   sizeof(struct ::kinfo_proc2), &nproc)) ==
176      NULL) {
177    ::kvm_close(kdp);
178    return 0;
179  }
180
181  for (int i = 0; i < nproc; i++) {
182    if (proc_kinfo[i].p_pid < 1)
183      continue; /* not valid */
184    /* Make sure the user is acceptable */
185    if (!all_users && proc_kinfo[i].p_ruid != our_uid)
186      continue;
187
188    if (proc_kinfo[i].p_pid == our_pid ||  // Skip this process
189        proc_kinfo[i].p_pid == 0 ||        // Skip kernel (kernel pid is 0)
190        proc_kinfo[i].p_stat == LSZOMB ||  // Zombies are bad
191        proc_kinfo[i].p_flag & P_TRACED || // Being debugged?
192        proc_kinfo[i].p_flag & P_WEXIT)    // Working on exiting
193      continue;
194
195    // Every thread is a process in NetBSD, but all the threads of a single
196    // process have the same pid. Do not store the process info in the result
197    // list if a process with given identifier is already registered there.
198    if (proc_kinfo[i].p_nlwps > 1) {
199      bool already_registered = false;
200      for (size_t pi = 0; pi < process_infos.GetSize(); pi++) {
201        if (process_infos.GetProcessIDAtIndex(pi) == proc_kinfo[i].p_pid) {
202          already_registered = true;
203          break;
204        }
205      }
206
207      if (already_registered)
208        continue;
209    }
210    ProcessInstanceInfo process_info;
211    process_info.SetProcessID(proc_kinfo[i].p_pid);
212    process_info.SetParentProcessID(proc_kinfo[i].p_ppid);
213    process_info.SetUserID(proc_kinfo[i].p_ruid);
214    process_info.SetGroupID(proc_kinfo[i].p_rgid);
215    process_info.SetEffectiveUserID(proc_kinfo[i].p_uid);
216    process_info.SetEffectiveGroupID(proc_kinfo[i].p_gid);
217    // Make sure our info matches before we go fetch the name and cpu type
218    if (match_info.Matches(process_info) &&
219        GetNetBSDProcessArgs(&match_info, process_info)) {
220      GetNetBSDProcessCPUType(process_info);
221      if (match_info.Matches(process_info))
222        process_infos.Append(process_info);
223    }
224  }
225
226  kvm_close(kdp); /* XXX: we don't check for error here */
227
228  return process_infos.GetSize();
229}
230
231bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
232  process_info.SetProcessID(pid);
233
234  if (GetNetBSDProcessArgs(NULL, process_info)) {
235    GetNetBSDProcessCPUType(process_info);
236    GetNetBSDProcessUserAndGroup(process_info);
237    return true;
238  }
239
240  process_info.Clear();
241  return false;
242}
243
244Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
245  return Status("unimplemented");
246}
247