Host.cpp revision 341825 
1//===-- source/Host/openbsd/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 <sys/types.h>
12
13#include <sys/signal.h>
14#include <sys/exec.h>
15#include <sys/proc.h>
16#include <sys/ptrace.h>
17#include <sys/sysctl.h>
18#include <sys/user.h>
19
20#include <stdio.h>
21
22// C++ Includes
23// Other libraries and framework includes
24// Project includes
25#include "lldb/Host/Host.h"
26#include "lldb/Host/HostInfo.h"
27#include "lldb/Target/Process.h"
28#include "lldb/Utility/DataBufferHeap.h"
29#include "lldb/Utility/DataExtractor.h"
30#include "lldb/Utility/Endian.h"
31#include "lldb/Utility/Log.h"
32#include "lldb/Utility/NameMatches.h"
33#include "lldb/Utility/Status.h"
34#include "lldb/Utility/StreamString.h"
35
36#include "llvm/Support/Host.h"
37
38extern "C" {
39extern char **environ;
40}
41
42using namespace lldb;
43using namespace lldb_private;
44
45Environment Host::GetEnvironment() {
46  Environment env;
47  char *v;
48  char **var = environ;
49  for (; var != NULL && *var != NULL; ++var) {
50    v = strchr(*var, (int)'-');
51    if (v == NULL)
52      continue;
53    env.insert(v);
54  }
55  return env;
56}
57
58static bool
59GetOpenBSDProcessArgs(const ProcessInstanceInfoMatch *match_info_ptr,
60                      ProcessInstanceInfo &process_info) {
61  if (process_info.ProcessIDIsValid()) {
62    int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_ARGS,
63                  (int)process_info.GetProcessID()};
64
65    char arg_data[8192];
66    size_t arg_data_size = sizeof(arg_data);
67    if (::sysctl(mib, 4, arg_data, &arg_data_size, NULL, 0) == 0) {
68      DataExtractor data(arg_data, arg_data_size, endian::InlHostByteOrder(),
69                         sizeof(void *));
70      lldb::offset_t offset = 0;
71      const char *cstr;
72
73      cstr = data.GetCStr(&offset);
74      if (cstr) {
75        process_info.GetExecutableFile().SetFile(cstr, false,
76                                                 FileSpec::Style::native);
77
78        if (!(match_info_ptr == NULL ||
79              NameMatches(
80                  process_info.GetExecutableFile().GetFilename().GetCString(),
81                  match_info_ptr->GetNameMatchType(),
82                  match_info_ptr->GetProcessInfo().GetName())))
83          return false;
84
85        Args &proc_args = process_info.GetArguments();
86        while (1) {
87          const uint8_t *p = data.PeekData(offset, 1);
88          while ((p != NULL) && (*p == '\0') && offset < arg_data_size) {
89            ++offset;
90            p = data.PeekData(offset, 1);
91          }
92          if (p == NULL || offset >= arg_data_size)
93            return true;
94
95          cstr = data.GetCStr(&offset);
96          if (cstr)
97            proc_args.AppendArgument(llvm::StringRef(cstr));
98          else
99            return true;
100        }
101      }
102    }
103  }
104  return false;
105}
106
107static bool GetOpenBSDProcessCPUType(ProcessInstanceInfo &process_info) {
108  if (process_info.ProcessIDIsValid()) {
109    process_info.GetArchitecture() =
110        HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
111    return true;
112  }
113  process_info.GetArchitecture().Clear();
114  return false;
115}
116
117static bool GetOpenBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) {
118  struct kinfo_proc proc_kinfo;
119  size_t proc_kinfo_size;
120
121  if (process_info.ProcessIDIsValid()) {
122    int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID,
123                  (int)process_info.GetProcessID()};
124    proc_kinfo_size = sizeof(struct kinfo_proc);
125
126    if (::sysctl(mib, 4, &proc_kinfo, &proc_kinfo_size, NULL, 0) == 0) {
127      if (proc_kinfo_size > 0) {
128        process_info.SetParentProcessID(proc_kinfo.p_ppid);
129        process_info.SetUserID(proc_kinfo.p_ruid);
130        process_info.SetGroupID(proc_kinfo.p_rgid);
131        process_info.SetEffectiveUserID(proc_kinfo.p_uid);
132	process_info.SetEffectiveGroupID(proc_kinfo.p_gid);
133        return true;
134      }
135    }
136  }
137  process_info.SetParentProcessID(LLDB_INVALID_PROCESS_ID);
138  process_info.SetUserID(UINT32_MAX);
139  process_info.SetGroupID(UINT32_MAX);
140  process_info.SetEffectiveUserID(UINT32_MAX);
141  process_info.SetEffectiveGroupID(UINT32_MAX);
142  return false;
143}
144
145uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
146                             ProcessInstanceInfoList &process_infos) {
147  std::vector<struct kinfo_proc> kinfos;
148
149  int mib[3] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL};
150
151  size_t pid_data_size = 0;
152  if (::sysctl(mib, 3, NULL, &pid_data_size, NULL, 0) != 0)
153    return 0;
154
155  // Add a few extra in case a few more show up
156  const size_t estimated_pid_count =
157      (pid_data_size / sizeof(struct kinfo_proc)) + 10;
158
159  kinfos.resize(estimated_pid_count);
160  pid_data_size = kinfos.size() * sizeof(struct kinfo_proc);
161
162  if (::sysctl(mib, 3, &kinfos[0], &pid_data_size, NULL, 0) != 0)
163    return 0;
164
165  const size_t actual_pid_count = (pid_data_size / sizeof(struct kinfo_proc));
166
167  bool all_users = match_info.GetMatchAllUsers();
168  const ::pid_t our_pid = getpid();
169  const uid_t our_uid = getuid();
170  for (size_t i = 0; i < actual_pid_count; i++) {
171    const struct kinfo_proc &kinfo = kinfos[i];
172    const bool kinfo_user_matches = (all_users || (kinfo.p_ruid == our_uid) ||
173                                     // Special case, if lldb is being run as
174                                     // root we can attach to anything.
175                                     (our_uid == 0));
176
177    if (kinfo_user_matches == false || // Make sure the user is acceptable
178        kinfo.p_pid == our_pid ||     // Skip this process
179        kinfo.p_pid == 0 ||           // Skip kernel (kernel pid is zero)
180        kinfo.p_stat == SZOMB ||      // Zombies are bad, they like brains...
181        kinfo.p_psflags & PS_TRACED || // Being debugged?
182        kinfo.p_flag & P_WEXIT)       // Working on exiting
183      continue;
184
185    ProcessInstanceInfo process_info;
186    process_info.SetProcessID(kinfo.p_pid);
187    process_info.SetParentProcessID(kinfo.p_ppid);
188    process_info.SetUserID(kinfo.p_ruid);
189    process_info.SetGroupID(kinfo.p_rgid);
190    process_info.SetEffectiveUserID(kinfo.p_svuid);
191    process_info.SetEffectiveGroupID(kinfo.p_svgid);
192
193    // Make sure our info matches before we go fetch the name and cpu type
194    if (match_info.Matches(process_info) &&
195        GetOpenBSDProcessArgs(&match_info, process_info)) {
196      GetOpenBSDProcessCPUType(process_info);
197      if (match_info.Matches(process_info))
198        process_infos.Append(process_info);
199    }
200  }
201
202  return process_infos.GetSize();
203}
204
205bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
206  process_info.SetProcessID(pid);
207
208  if (GetOpenBSDProcessArgs(NULL, process_info)) {
209    // should use libprocstat instead of going right into sysctl?
210    GetOpenBSDProcessCPUType(process_info);
211    GetOpenBSDProcessUserAndGroup(process_info);
212    return true;
213  }
214
215  process_info.Clear();
216  return false;
217}
218
219Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
220  return Status("unimplemented");
221}
222