1 //===-- source/Host/netbsd/HostNetBSD.cpp ---------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include <cstdio>
10 #include <dlfcn.h>
11 #include <execinfo.h>
12 #include <sys/proc.h>
13 #include <sys/sysctl.h>
14 #include <sys/types.h>
15
16 #include <climits>
17
18 #include <kvm.h>
19 #include <sys/exec.h>
20 #include <sys/ptrace.h>
21
22 #include "lldb/Host/FileSystem.h"
23 #include "lldb/Host/Host.h"
24 #include "lldb/Host/HostInfo.h"
25 #include "lldb/Utility/DataBufferHeap.h"
26 #include "lldb/Utility/DataExtractor.h"
27 #include "lldb/Utility/Endian.h"
28 #include "lldb/Utility/LLDBLog.h"
29 #include "lldb/Utility/Log.h"
30 #include "lldb/Utility/NameMatches.h"
31 #include "lldb/Utility/ProcessInfo.h"
32 #include "lldb/Utility/Status.h"
33 #include "lldb/Utility/StreamString.h"
34
35 #include "llvm/Object/ELF.h"
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 namespace lldb_private {
46 class ProcessLaunchInfo;
47 }
48
GetEnvironment()49 Environment Host::GetEnvironment() { return Environment(environ); }
50
GetNetBSDProcessArgs(const ProcessInstanceInfoMatch * match_info_ptr,ProcessInstanceInfo & process_info)51 static bool GetNetBSDProcessArgs(const ProcessInstanceInfoMatch *match_info_ptr,
52 ProcessInstanceInfo &process_info) {
53 if (!process_info.ProcessIDIsValid())
54 return false;
55
56 int pid = process_info.GetProcessID();
57
58 int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_ARGV};
59
60 char arg_data[8192];
61 size_t arg_data_size = sizeof(arg_data);
62 if (::sysctl(mib, 4, arg_data, &arg_data_size, NULL, 0) != 0)
63 return false;
64
65 DataExtractor data(arg_data, arg_data_size, endian::InlHostByteOrder(),
66 sizeof(void *));
67 lldb::offset_t offset = 0;
68 const char *cstr;
69
70 cstr = data.GetCStr(&offset);
71 if (!cstr)
72 return false;
73
74 process_info.GetExecutableFile().SetFile(cstr,
75 FileSpec::Style::native);
76
77 if (!(match_info_ptr == NULL ||
78 NameMatches(process_info.GetExecutableFile().GetFilename().GetCString(),
79 match_info_ptr->GetNameMatchType(),
80 match_info_ptr->GetProcessInfo().GetName())))
81 return false;
82
83 process_info.SetArg0(cstr);
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 break;
93
94 cstr = data.GetCStr(&offset);
95 if (!cstr)
96 break;
97
98 proc_args.AppendArgument(llvm::StringRef(cstr));
99 }
100
101 return true;
102 }
103
GetNetBSDProcessCPUType(ProcessInstanceInfo & process_info)104 static bool GetNetBSDProcessCPUType(ProcessInstanceInfo &process_info) {
105 Log *log = GetLog(LLDBLog::Host);
106
107 if (process_info.ProcessIDIsValid()) {
108 auto buffer_sp = FileSystem::Instance().CreateDataBuffer(
109 process_info.GetExecutableFile(), 0x20, 0);
110 if (buffer_sp) {
111 uint8_t exe_class = llvm::object::getElfArchType(
112 {reinterpret_cast<char *>(buffer_sp->GetBytes()),
113 size_t(buffer_sp->GetByteSize())})
114 .first;
115
116 switch (exe_class) {
117 case llvm::ELF::ELFCLASS32:
118 process_info.GetArchitecture() =
119 HostInfo::GetArchitecture(HostInfo::eArchKind32);
120 return true;
121 case llvm::ELF::ELFCLASS64:
122 process_info.GetArchitecture() =
123 HostInfo::GetArchitecture(HostInfo::eArchKind64);
124 return true;
125 default:
126 LLDB_LOG(log, "Unknown elf class ({0}) in file {1}", exe_class,
127 process_info.GetExecutableFile());
128 }
129 }
130 }
131 process_info.GetArchitecture().Clear();
132 return false;
133 }
134
GetNetBSDProcessUserAndGroup(ProcessInstanceInfo & process_info)135 static bool GetNetBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) {
136 ::kvm_t *kdp;
137 char errbuf[_POSIX2_LINE_MAX]; /* XXX: error string unused */
138
139 struct ::kinfo_proc2 *proc_kinfo;
140 const int pid = process_info.GetProcessID();
141 int nproc;
142
143 if (!process_info.ProcessIDIsValid())
144 goto error;
145
146 if ((kdp = ::kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf)) == NULL)
147 goto error;
148
149 if ((proc_kinfo = ::kvm_getproc2(kdp, KERN_PROC_PID, pid,
150 sizeof(struct ::kinfo_proc2), &nproc)) ==
151 NULL) {
152 ::kvm_close(kdp);
153 goto error;
154 }
155
156 if (nproc < 1) {
157 ::kvm_close(kdp); /* XXX: we don't check for error here */
158 goto error;
159 }
160
161 process_info.SetParentProcessID(proc_kinfo->p_ppid);
162 process_info.SetUserID(proc_kinfo->p_ruid);
163 process_info.SetGroupID(proc_kinfo->p_rgid);
164 process_info.SetEffectiveUserID(proc_kinfo->p_uid);
165 process_info.SetEffectiveGroupID(proc_kinfo->p_gid);
166
167 ::kvm_close(kdp); /* XXX: we don't check for error here */
168
169 return true;
170
171 error:
172 process_info.SetParentProcessID(LLDB_INVALID_PROCESS_ID);
173 process_info.SetUserID(UINT32_MAX);
174 process_info.SetGroupID(UINT32_MAX);
175 process_info.SetEffectiveUserID(UINT32_MAX);
176 process_info.SetEffectiveGroupID(UINT32_MAX);
177 return false;
178 }
179
FindProcessesImpl(const ProcessInstanceInfoMatch & match_info,ProcessInstanceInfoList & process_infos)180 uint32_t Host::FindProcessesImpl(const ProcessInstanceInfoMatch &match_info,
181 ProcessInstanceInfoList &process_infos) {
182 const ::pid_t our_pid = ::getpid();
183 const ::uid_t our_uid = ::getuid();
184
185 const bool all_users =
186 match_info.GetMatchAllUsers() ||
187 // Special case, if lldb is being run as root we can attach to anything
188 (our_uid == 0);
189
190 kvm_t *kdp;
191 char errbuf[_POSIX2_LINE_MAX]; /* XXX: error string unused */
192 if ((kdp = ::kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf)) == NULL)
193 return 0;
194
195 struct ::kinfo_proc2 *proc_kinfo;
196 int nproc;
197 if ((proc_kinfo = ::kvm_getproc2(kdp, KERN_PROC_ALL, 0,
198 sizeof(struct ::kinfo_proc2), &nproc)) ==
199 NULL) {
200 ::kvm_close(kdp);
201 return 0;
202 }
203
204 ProcessInstanceInfoMatch match_info_noname{match_info};
205 match_info_noname.SetNameMatchType(NameMatch::Ignore);
206
207 for (int i = 0; i < nproc; i++) {
208 if (proc_kinfo[i].p_pid < 1)
209 continue; /* not valid */
210 /* Make sure the user is acceptable */
211 if (!all_users && proc_kinfo[i].p_ruid != our_uid)
212 continue;
213
214 if (proc_kinfo[i].p_pid == our_pid || // Skip this process
215 proc_kinfo[i].p_pid == 0 || // Skip kernel (kernel pid is 0)
216 proc_kinfo[i].p_stat == LSZOMB || // Zombies are bad
217 proc_kinfo[i].p_flag & P_TRACED || // Being debugged?
218 proc_kinfo[i].p_flag & P_WEXIT) // Working on exiting
219 continue;
220
221 // Every thread is a process in NetBSD, but all the threads of a single
222 // process have the same pid. Do not store the process info in the result
223 // list if a process with given identifier is already registered there.
224 if (proc_kinfo[i].p_nlwps > 1) {
225 bool already_registered = false;
226 for (size_t pi = 0; pi < process_infos.size(); pi++) {
227 if ((::pid_t)process_infos[pi].GetProcessID() == proc_kinfo[i].p_pid) {
228 already_registered = true;
229 break;
230 }
231 }
232
233 if (already_registered)
234 continue;
235 }
236 ProcessInstanceInfo process_info;
237 process_info.SetProcessID(proc_kinfo[i].p_pid);
238 process_info.SetParentProcessID(proc_kinfo[i].p_ppid);
239 process_info.SetUserID(proc_kinfo[i].p_ruid);
240 process_info.SetGroupID(proc_kinfo[i].p_rgid);
241 process_info.SetEffectiveUserID(proc_kinfo[i].p_uid);
242 process_info.SetEffectiveGroupID(proc_kinfo[i].p_gid);
243 // Make sure our info matches before we go fetch the name and cpu type
244 if (match_info_noname.Matches(process_info) &&
245 GetNetBSDProcessArgs(&match_info, process_info)) {
246 GetNetBSDProcessCPUType(process_info);
247 if (match_info.Matches(process_info))
248 process_infos.push_back(process_info);
249 }
250 }
251
252 kvm_close(kdp); /* XXX: we don't check for error here */
253
254 return process_infos.size();
255 }
256
GetProcessInfo(lldb::pid_t pid,ProcessInstanceInfo & process_info)257 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
258 process_info.SetProcessID(pid);
259
260 if (GetNetBSDProcessArgs(NULL, process_info)) {
261 GetNetBSDProcessCPUType(process_info);
262 GetNetBSDProcessUserAndGroup(process_info);
263 return true;
264 }
265
266 process_info.Clear();
267 return false;
268 }
269
ShellExpandArguments(ProcessLaunchInfo & launch_info)270 Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) {
271 return Status("unimplemented");
272 }
273