1 //===-- source/Host/openbsd/Host.cpp ----------------------------*- C++ -*-===// 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 <sys/types.h> 10 11 #include <sys/signal.h> 12 #include <sys/exec.h> 13 #include <sys/proc.h> 14 #include <sys/ptrace.h> 15 #include <sys/sysctl.h> 16 #include <sys/user.h> 17 18 #include <stdio.h> 19 20 #include "lldb/Host/Host.h" 21 #include "lldb/Host/HostInfo.h" 22 #include "lldb/Utility/DataBufferHeap.h" 23 #include "lldb/Utility/DataExtractor.h" 24 #include "lldb/Utility/Endian.h" 25 #include "lldb/Utility/Log.h" 26 #include "lldb/Utility/NameMatches.h" 27 #include "lldb/Utility/ProcessInfo.h" 28 #include "lldb/Utility/Status.h" 29 #include "lldb/Utility/StreamString.h" 30 31 #include "llvm/Support/Host.h" 32 33 extern "C" { 34 extern char **environ; 35 } 36 37 using namespace lldb; 38 using namespace lldb_private; 39 40 namespace lldb_private { 41 class ProcessLaunchInfo; 42 } 43 44 Environment Host::GetEnvironment() { 45 Environment env; 46 char *v; 47 char **var = environ; 48 for (; var != NULL && *var != NULL; ++var) { 49 v = strchr(*var, (int)'-'); 50 if (v == NULL) 51 continue; 52 env.insert(v); 53 } 54 return env; 55 } 56 57 static bool 58 GetOpenBSDProcessArgs(const ProcessInstanceInfoMatch *match_info_ptr, 59 ProcessInstanceInfo &process_info) { 60 if (!process_info.ProcessIDIsValid()) 61 return false; 62 63 int pid = process_info.GetProcessID(); 64 65 int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_ARGV}; 66 size_t kern_proc_args_size = 0; 67 68 // On OpenBSD, this will just fill ARG_MAX all the time 69 if (::sysctl(mib, 4, NULL, &kern_proc_args_size, NULL, 0) == -1) 70 return false; 71 72 std::string arg_data(kern_proc_args_size, 0); 73 74 if (::sysctl(mib, 4, (void *)arg_data.data(), &kern_proc_args_size, NULL, 0) == -1) 75 return false; 76 77 arg_data.resize(kern_proc_args_size); 78 79 // arg_data is a NULL terminated list of pointers, where the pointers 80 // point within arg_data to the location of the arg string 81 DataExtractor data(arg_data.data(), arg_data.length(), endian::InlHostByteOrder(), sizeof(void *)); 82 83 lldb::offset_t offset = 0; 84 lldb::offset_t arg_offset = 0; 85 uint64_t arg_addr = 0; 86 const char *cstr; 87 88 arg_addr = data.GetAddress(&offset); 89 arg_offset = arg_addr - (uint64_t)arg_data.data(); 90 cstr = data.GetCStr(&arg_offset); 91 92 if (!cstr) 93 return false; 94 95 process_info.GetExecutableFile().SetFile(cstr, FileSpec::Style::native); 96 97 if (match_info_ptr != NULL && 98 !NameMatches(process_info.GetExecutableFile().GetFilename().GetCString(), 99 match_info_ptr->GetNameMatchType(), 100 match_info_ptr->GetProcessInfo().GetName())) 101 { 102 return false; 103 } 104 105 Args &proc_args = process_info.GetArguments(); 106 107 while (1) { 108 arg_addr = data.GetAddress(&offset); 109 if (arg_addr == 0) 110 break; 111 arg_offset = arg_addr - (uint64_t)arg_data.data(); 112 cstr = data.GetCStr(&arg_offset); 113 proc_args.AppendArgument(cstr); 114 } 115 return true; 116 } 117 118 static bool GetOpenBSDProcessCPUType(ProcessInstanceInfo &process_info) { 119 if (process_info.ProcessIDIsValid()) { 120 process_info.GetArchitecture() = 121 HostInfo::GetArchitecture(HostInfo::eArchKindDefault); 122 return true; 123 } 124 process_info.GetArchitecture().Clear(); 125 return false; 126 } 127 128 static bool GetOpenBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) { 129 130 if (process_info.ProcessIDIsValid()) { 131 struct kinfo_proc proc_kinfo = {}; 132 size_t proc_kinfo_size = sizeof(proc_kinfo); 133 int mib[6] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, 134 (int)process_info.GetProcessID(), 135 sizeof(proc_kinfo), 1}; 136 137 if (::sysctl(mib, 6, &proc_kinfo, &proc_kinfo_size, NULL, 0) == 0) { 138 if (proc_kinfo_size > 0) { 139 process_info.SetParentProcessID(proc_kinfo.p_ppid); 140 process_info.SetUserID(proc_kinfo.p_ruid); 141 process_info.SetGroupID(proc_kinfo.p_rgid); 142 process_info.SetEffectiveUserID(proc_kinfo.p_uid); 143 process_info.SetEffectiveGroupID(proc_kinfo.p_gid); 144 return true; 145 } 146 } 147 } 148 process_info.SetParentProcessID(LLDB_INVALID_PROCESS_ID); 149 process_info.SetUserID(UINT32_MAX); 150 process_info.SetGroupID(UINT32_MAX); 151 process_info.SetEffectiveUserID(UINT32_MAX); 152 process_info.SetEffectiveGroupID(UINT32_MAX); 153 return false; 154 } 155 156 uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info, 157 ProcessInstanceInfoList &process_infos) { 158 std::vector<struct kinfo_proc> kinfos; 159 160 int mib[6] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0, sizeof(struct kinfo_proc), 0}; 161 162 size_t pid_data_size = 0; 163 if (::sysctl(mib, 6, NULL, &pid_data_size, NULL, 0) != 0) 164 return 0; 165 166 // Add a few extra in case a few more show up 167 const size_t estimated_pid_count = 168 (pid_data_size / sizeof(struct kinfo_proc)) + 10; 169 170 kinfos.resize(estimated_pid_count); 171 mib[5] = estimated_pid_count; 172 pid_data_size = kinfos.size() * sizeof(struct kinfo_proc); 173 174 if (::sysctl(mib, 6, &kinfos[0], &pid_data_size, NULL, 0) != 0) 175 return 0; 176 177 const size_t actual_pid_count = (pid_data_size / sizeof(struct kinfo_proc)); 178 179 bool all_users = match_info.GetMatchAllUsers(); 180 const ::pid_t our_pid = getpid(); 181 const uid_t our_uid = getuid(); 182 for (size_t i = 0; i < actual_pid_count; i++) { 183 const struct kinfo_proc &kinfo = kinfos[i]; 184 const bool kinfo_user_matches = (all_users || (kinfo.p_ruid == our_uid) || 185 // Special case, if lldb is being run as 186 // root we can attach to anything. 187 (our_uid == 0)); 188 189 if (kinfo_user_matches == false || // Make sure the user is acceptable 190 kinfo.p_pid == our_pid || // Skip this process 191 kinfo.p_pid == 0 || // Skip kernel (kernel pid is zero) 192 kinfo.p_stat == SZOMB || // Zombies are bad, they like brains... 193 kinfo.p_psflags & PS_TRACED || // Being debugged? 194 kinfo.p_flag & P_WEXIT) // Working on exiting 195 continue; 196 197 ProcessInstanceInfo process_info; 198 process_info.SetProcessID(kinfo.p_pid); 199 process_info.SetParentProcessID(kinfo.p_ppid); 200 process_info.SetUserID(kinfo.p_ruid); 201 process_info.SetGroupID(kinfo.p_rgid); 202 process_info.SetEffectiveUserID(kinfo.p_svuid); 203 process_info.SetEffectiveGroupID(kinfo.p_svgid); 204 205 // Make sure our info matches before we go fetch the name and cpu type 206 if (match_info.Matches(process_info) && 207 GetOpenBSDProcessArgs(&match_info, process_info)) { 208 GetOpenBSDProcessCPUType(process_info); 209 if (match_info.Matches(process_info)) 210 process_infos.Append(process_info); 211 } 212 } 213 214 return process_infos.GetSize(); 215 } 216 217 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) { 218 process_info.SetProcessID(pid); 219 220 if (GetOpenBSDProcessArgs(NULL, process_info)) { 221 // should use libprocstat instead of going right into sysctl? 222 GetOpenBSDProcessCPUType(process_info); 223 GetOpenBSDProcessUserAndGroup(process_info); 224 return true; 225 } 226 227 process_info.Clear(); 228 return false; 229 } 230 231 Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) { 232 return Status("unimplemented"); 233 } 234