1 //===-- source/Host/openbsd/Host.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 <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() { return Environment(environ); } 45 46 static bool 47 GetOpenBSDProcessArgs(const ProcessInstanceInfoMatch *match_info_ptr, 48 ProcessInstanceInfo &process_info) { 49 if (!process_info.ProcessIDIsValid()) 50 return false; 51 52 int pid = process_info.GetProcessID(); 53 54 int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_ARGV}; 55 size_t kern_proc_args_size = 0; 56 57 // On OpenBSD, this will just fill ARG_MAX all the time 58 if (::sysctl(mib, 4, NULL, &kern_proc_args_size, NULL, 0) == -1) 59 return false; 60 61 std::string arg_data(kern_proc_args_size, 0); 62 63 if (::sysctl(mib, 4, (void *)arg_data.data(), &kern_proc_args_size, NULL, 0) == -1) 64 return false; 65 66 arg_data.resize(kern_proc_args_size); 67 68 // arg_data is a NULL terminated list of pointers, where the pointers 69 // point within arg_data to the location of the arg string 70 DataExtractor data(arg_data.data(), arg_data.length(), endian::InlHostByteOrder(), sizeof(void *)); 71 72 lldb::offset_t offset = 0; 73 lldb::offset_t arg_offset = 0; 74 uint64_t arg_addr = 0; 75 const char *cstr; 76 77 arg_addr = data.GetAddress(&offset); 78 arg_offset = arg_addr - (uint64_t)arg_data.data(); 79 cstr = data.GetCStr(&arg_offset); 80 81 if (!cstr) 82 return false; 83 84 process_info.GetExecutableFile().SetFile(cstr, FileSpec::Style::native); 85 86 if (match_info_ptr != NULL && 87 !NameMatches(process_info.GetExecutableFile().GetFilename().GetCString(), 88 match_info_ptr->GetNameMatchType(), 89 match_info_ptr->GetProcessInfo().GetName())) 90 { 91 return false; 92 } 93 94 Args &proc_args = process_info.GetArguments(); 95 96 while (1) { 97 arg_addr = data.GetAddress(&offset); 98 if (arg_addr == 0) 99 break; 100 arg_offset = arg_addr - (uint64_t)arg_data.data(); 101 cstr = data.GetCStr(&arg_offset); 102 proc_args.AppendArgument(cstr); 103 } 104 return true; 105 } 106 107 static 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 } 116 117 static bool GetOpenBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) { 118 119 if (process_info.ProcessIDIsValid()) { 120 struct kinfo_proc proc_kinfo = {}; 121 size_t proc_kinfo_size = sizeof(proc_kinfo); 122 int mib[6] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, 123 (int)process_info.GetProcessID(), 124 sizeof(proc_kinfo), 1}; 125 126 if (::sysctl(mib, 6, &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 } 144 145 uint32_t Host::FindProcessesImpl(const ProcessInstanceInfoMatch &match_info, 146 ProcessInstanceInfoList &process_infos) { 147 std::vector<struct kinfo_proc> kinfos; 148 149 int mib[6] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0, sizeof(struct kinfo_proc), 0}; 150 151 size_t pid_data_size = 0; 152 if (::sysctl(mib, 6, 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 mib[5] = estimated_pid_count; 161 pid_data_size = kinfos.size() * sizeof(struct kinfo_proc); 162 163 if (::sysctl(mib, 6, &kinfos[0], &pid_data_size, NULL, 0) != 0) 164 return 0; 165 166 const size_t actual_pid_count = (pid_data_size / sizeof(struct kinfo_proc)); 167 168 bool all_users = match_info.GetMatchAllUsers(); 169 const ::pid_t our_pid = getpid(); 170 const uid_t our_uid = getuid(); 171 for (size_t i = 0; i < actual_pid_count; i++) { 172 const struct kinfo_proc &kinfo = kinfos[i]; 173 const bool kinfo_user_matches = (all_users || (kinfo.p_ruid == our_uid) || 174 // Special case, if lldb is being run as 175 // root we can attach to anything. 176 (our_uid == 0)); 177 178 if (kinfo_user_matches == false || // Make sure the user is acceptable 179 kinfo.p_pid == our_pid || // Skip this process 180 kinfo.p_pid == 0 || // Skip kernel (kernel pid is zero) 181 kinfo.p_stat == SZOMB || // Zombies are bad, they like brains... 182 kinfo.p_psflags & PS_TRACED || // Being debugged? 183 kinfo.p_flag & P_WEXIT) // Working on exiting 184 continue; 185 186 ProcessInstanceInfo process_info; 187 process_info.SetProcessID(kinfo.p_pid); 188 process_info.SetParentProcessID(kinfo.p_ppid); 189 process_info.SetUserID(kinfo.p_ruid); 190 process_info.SetGroupID(kinfo.p_rgid); 191 process_info.SetEffectiveUserID(kinfo.p_svuid); 192 process_info.SetEffectiveGroupID(kinfo.p_svgid); 193 194 // Make sure our info matches before we go fetch the name and cpu type 195 if (match_info.Matches(process_info) && 196 GetOpenBSDProcessArgs(&match_info, process_info)) { 197 GetOpenBSDProcessCPUType(process_info); 198 if (match_info.Matches(process_info)) 199 process_infos.push_back(process_info); 200 } 201 } 202 203 return process_infos.size(); 204 } 205 206 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) { 207 process_info.SetProcessID(pid); 208 209 if (GetOpenBSDProcessArgs(NULL, process_info)) { 210 // should use libprocstat instead of going right into sysctl? 211 GetOpenBSDProcessCPUType(process_info); 212 GetOpenBSDProcessUserAndGroup(process_info); 213 return true; 214 } 215 216 process_info.Clear(); 217 return false; 218 } 219 220 Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) { 221 return Status("unimplemented"); 222 } 223