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 
38 extern "C" {
39 extern char **environ;
40 }
41 
42 using namespace lldb;
43 using namespace lldb_private;
44 
45 Environment 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 
58 static bool
59 GetOpenBSDProcessArgs(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 
77         if (!(match_info_ptr == NULL ||
78               NameMatches(
79                   process_info.GetExecutableFile().GetFilename().GetCString(),
80                   match_info_ptr->GetNameMatchType(),
81                   match_info_ptr->GetProcessInfo().GetName())))
82           return false;
83 
84         Args &proc_args = process_info.GetArguments();
85         while (1) {
86           const uint8_t *p = data.PeekData(offset, 1);
87           while ((p != NULL) && (*p == '\0') && offset < arg_data_size) {
88             ++offset;
89             p = data.PeekData(offset, 1);
90           }
91           if (p == NULL || offset >= arg_data_size)
92             return true;
93 
94           cstr = data.GetCStr(&offset);
95           if (cstr)
96             proc_args.AppendArgument(llvm::StringRef(cstr));
97           else
98             return true;
99         }
100       }
101     }
102   }
103   return false;
104 }
105 
106 static bool GetOpenBSDProcessCPUType(ProcessInstanceInfo &process_info) {
107   if (process_info.ProcessIDIsValid()) {
108     process_info.GetArchitecture() =
109         HostInfo::GetArchitecture(HostInfo::eArchKindDefault);
110     return true;
111   }
112   process_info.GetArchitecture().Clear();
113   return false;
114 }
115 
116 static bool GetOpenBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) {
117   struct kinfo_proc proc_kinfo;
118   size_t proc_kinfo_size;
119 
120   if (process_info.ProcessIDIsValid()) {
121     int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID,
122                   (int)process_info.GetProcessID()};
123     proc_kinfo_size = sizeof(struct kinfo_proc);
124 
125     if (::sysctl(mib, 4, &proc_kinfo, &proc_kinfo_size, NULL, 0) == 0) {
126       if (proc_kinfo_size > 0) {
127         process_info.SetParentProcessID(proc_kinfo.p_ppid);
128         process_info.SetUserID(proc_kinfo.p_ruid);
129         process_info.SetGroupID(proc_kinfo.p_rgid);
130         process_info.SetEffectiveUserID(proc_kinfo.p_uid);
131 	process_info.SetEffectiveGroupID(proc_kinfo.p_gid);
132         return true;
133       }
134     }
135   }
136   process_info.SetParentProcessID(LLDB_INVALID_PROCESS_ID);
137   process_info.SetUserID(UINT32_MAX);
138   process_info.SetGroupID(UINT32_MAX);
139   process_info.SetEffectiveUserID(UINT32_MAX);
140   process_info.SetEffectiveGroupID(UINT32_MAX);
141   return false;
142 }
143 
144 uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
145                              ProcessInstanceInfoList &process_infos) {
146   std::vector<struct kinfo_proc> kinfos;
147 
148   int mib[3] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL};
149 
150   size_t pid_data_size = 0;
151   if (::sysctl(mib, 3, NULL, &pid_data_size, NULL, 0) != 0)
152     return 0;
153 
154   // Add a few extra in case a few more show up
155   const size_t estimated_pid_count =
156       (pid_data_size / sizeof(struct kinfo_proc)) + 10;
157 
158   kinfos.resize(estimated_pid_count);
159   pid_data_size = kinfos.size() * sizeof(struct kinfo_proc);
160 
161   if (::sysctl(mib, 3, &kinfos[0], &pid_data_size, NULL, 0) != 0)
162     return 0;
163 
164   const size_t actual_pid_count = (pid_data_size / sizeof(struct kinfo_proc));
165 
166   bool all_users = match_info.GetMatchAllUsers();
167   const ::pid_t our_pid = getpid();
168   const uid_t our_uid = getuid();
169   for (size_t i = 0; i < actual_pid_count; i++) {
170     const struct kinfo_proc &kinfo = kinfos[i];
171     const bool kinfo_user_matches = (all_users || (kinfo.p_ruid == our_uid) ||
172                                      // Special case, if lldb is being run as
173                                      // root we can attach to anything.
174                                      (our_uid == 0));
175 
176     if (kinfo_user_matches == false || // Make sure the user is acceptable
177         kinfo.p_pid == our_pid ||     // Skip this process
178         kinfo.p_pid == 0 ||           // Skip kernel (kernel pid is zero)
179         kinfo.p_stat == SZOMB ||      // Zombies are bad, they like brains...
180         kinfo.p_psflags & PS_TRACED || // Being debugged?
181         kinfo.p_flag & P_WEXIT)       // Working on exiting
182       continue;
183 
184     ProcessInstanceInfo process_info;
185     process_info.SetProcessID(kinfo.p_pid);
186     process_info.SetParentProcessID(kinfo.p_ppid);
187     process_info.SetUserID(kinfo.p_ruid);
188     process_info.SetGroupID(kinfo.p_rgid);
189     process_info.SetEffectiveUserID(kinfo.p_svuid);
190     process_info.SetEffectiveGroupID(kinfo.p_svgid);
191 
192     // Make sure our info matches before we go fetch the name and cpu type
193     if (match_info.Matches(process_info) &&
194         GetOpenBSDProcessArgs(&match_info, process_info)) {
195       GetOpenBSDProcessCPUType(process_info);
196       if (match_info.Matches(process_info))
197         process_infos.Append(process_info);
198     }
199   }
200 
201   return process_infos.GetSize();
202 }
203 
204 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
205   process_info.SetProcessID(pid);
206 
207   if (GetOpenBSDProcessArgs(NULL, process_info)) {
208     // should use libprocstat instead of going right into sysctl?
209     GetOpenBSDProcessCPUType(process_info);
210     GetOpenBSDProcessUserAndGroup(process_info);
211     return true;
212   }
213 
214   process_info.Clear();
215   return false;
216 }
217 
218 Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
219   return Status("unimplemented");
220 }
221