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/Core/Module.h"
26 #include "lldb/Host/Host.h"
27 #include "lldb/Host/HostInfo.h"
28 #include "lldb/Target/Platform.h"
29 #include "lldb/Target/Process.h"
30 #include "lldb/Utility/CleanUp.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 
41 extern "C" {
42 extern char **environ;
43 }
44 
45 using namespace lldb;
46 using namespace lldb_private;
47 
48 Environment Host::GetEnvironment() {
49   Environment env;
50   char *v;
51   char **var = environ;
52   for (; var != NULL && *var != NULL; ++var) {
53     v = strchr(*var, (int)'-');
54     if (v == NULL)
55       continue;
56     env.insert(v);
57   }
58   return env;
59 }
60 
61 static bool
62 GetOpenBSDProcessArgs(const ProcessInstanceInfoMatch *match_info_ptr,
63                       ProcessInstanceInfo &process_info) {
64   if (process_info.ProcessIDIsValid()) {
65     int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_ARGS,
66                   (int)process_info.GetProcessID()};
67 
68     char arg_data[8192];
69     size_t arg_data_size = sizeof(arg_data);
70     if (::sysctl(mib, 4, arg_data, &arg_data_size, NULL, 0) == 0) {
71       DataExtractor data(arg_data, arg_data_size, endian::InlHostByteOrder(),
72                          sizeof(void *));
73       lldb::offset_t offset = 0;
74       const char *cstr;
75 
76       cstr = data.GetCStr(&offset);
77       if (cstr) {
78         process_info.GetExecutableFile().SetFile(cstr, false);
79 
80         if (!(match_info_ptr == NULL ||
81               NameMatches(
82                   process_info.GetExecutableFile().GetFilename().GetCString(),
83                   match_info_ptr->GetNameMatchType(),
84                   match_info_ptr->GetProcessInfo().GetName())))
85           return false;
86 
87         Args &proc_args = process_info.GetArguments();
88         while (1) {
89           const uint8_t *p = data.PeekData(offset, 1);
90           while ((p != NULL) && (*p == '\0') && offset < arg_data_size) {
91             ++offset;
92             p = data.PeekData(offset, 1);
93           }
94           if (p == NULL || offset >= arg_data_size)
95             return true;
96 
97           cstr = data.GetCStr(&offset);
98           if (cstr)
99             proc_args.AppendArgument(llvm::StringRef(cstr));
100           else
101             return true;
102         }
103       }
104     }
105   }
106   return false;
107 }
108 
109 static bool GetOpenBSDProcessCPUType(ProcessInstanceInfo &process_info) {
110   if (process_info.ProcessIDIsValid()) {
111     process_info.GetArchitecture() =
112         HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
113     return true;
114   }
115   process_info.GetArchitecture().Clear();
116   return false;
117 }
118 
119 static bool GetOpenBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) {
120   struct kinfo_proc proc_kinfo;
121   size_t proc_kinfo_size;
122 
123   if (process_info.ProcessIDIsValid()) {
124     int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID,
125                   (int)process_info.GetProcessID()};
126     proc_kinfo_size = sizeof(struct kinfo_proc);
127 
128     if (::sysctl(mib, 4, &proc_kinfo, &proc_kinfo_size, NULL, 0) == 0) {
129       if (proc_kinfo_size > 0) {
130         process_info.SetParentProcessID(proc_kinfo.p_ppid);
131         process_info.SetUserID(proc_kinfo.p_ruid);
132         process_info.SetGroupID(proc_kinfo.p_rgid);
133         process_info.SetEffectiveUserID(proc_kinfo.p_uid);
134 	process_info.SetEffectiveGroupID(proc_kinfo.p_gid);
135         return true;
136       }
137     }
138   }
139   process_info.SetParentProcessID(LLDB_INVALID_PROCESS_ID);
140   process_info.SetUserID(UINT32_MAX);
141   process_info.SetGroupID(UINT32_MAX);
142   process_info.SetEffectiveUserID(UINT32_MAX);
143   process_info.SetEffectiveGroupID(UINT32_MAX);
144   return false;
145 }
146 
147 uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
148                              ProcessInstanceInfoList &process_infos) {
149   std::vector<struct kinfo_proc> kinfos;
150 
151   int mib[3] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL};
152 
153   size_t pid_data_size = 0;
154   if (::sysctl(mib, 3, NULL, &pid_data_size, NULL, 0) != 0)
155     return 0;
156 
157   // Add a few extra in case a few more show up
158   const size_t estimated_pid_count =
159       (pid_data_size / sizeof(struct kinfo_proc)) + 10;
160 
161   kinfos.resize(estimated_pid_count);
162   pid_data_size = kinfos.size() * sizeof(struct kinfo_proc);
163 
164   if (::sysctl(mib, 3, &kinfos[0], &pid_data_size, NULL, 0) != 0)
165     return 0;
166 
167   const size_t actual_pid_count = (pid_data_size / sizeof(struct kinfo_proc));
168 
169   bool all_users = match_info.GetMatchAllUsers();
170   const ::pid_t our_pid = getpid();
171   const uid_t our_uid = getuid();
172   for (size_t i = 0; i < actual_pid_count; i++) {
173     const struct kinfo_proc &kinfo = kinfos[i];
174     const bool kinfo_user_matches = (all_users || (kinfo.p_ruid == our_uid) ||
175                                      // Special case, if lldb is being run as
176                                      // root we can attach to anything.
177                                      (our_uid == 0));
178 
179     if (kinfo_user_matches == false || // Make sure the user is acceptable
180         kinfo.p_pid == our_pid ||     // Skip this process
181         kinfo.p_pid == 0 ||           // Skip kernel (kernel pid is zero)
182         kinfo.p_stat == SZOMB ||      // Zombies are bad, they like brains...
183         kinfo.p_psflags & PS_TRACED || // Being debugged?
184         kinfo.p_flag & P_WEXIT)       // Working on exiting
185       continue;
186 
187     ProcessInstanceInfo process_info;
188     process_info.SetProcessID(kinfo.p_pid);
189     process_info.SetParentProcessID(kinfo.p_ppid);
190     process_info.SetUserID(kinfo.p_ruid);
191     process_info.SetGroupID(kinfo.p_rgid);
192     process_info.SetEffectiveUserID(kinfo.p_svuid);
193     process_info.SetEffectiveGroupID(kinfo.p_svgid);
194 
195     // Make sure our info matches before we go fetch the name and cpu type
196     if (match_info.Matches(process_info) &&
197         GetOpenBSDProcessArgs(&match_info, process_info)) {
198       GetOpenBSDProcessCPUType(process_info);
199       if (match_info.Matches(process_info))
200         process_infos.Append(process_info);
201     }
202   }
203 
204   return process_infos.GetSize();
205 }
206 
207 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
208   process_info.SetProcessID(pid);
209 
210   if (GetOpenBSDProcessArgs(NULL, process_info)) {
211     // should use libprocstat instead of going right into sysctl?
212     GetOpenBSDProcessCPUType(process_info);
213     GetOpenBSDProcessUserAndGroup(process_info);
214     return true;
215   }
216 
217   process_info.Clear();
218   return false;
219 }
220 
221 Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
222   return Status("unimplemented");
223 }
224