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 <cstdio> 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/TargetParser/Host.h" 32 33 using namespace lldb; 34 using namespace lldb_private; 35 36 namespace lldb_private { 37 class ProcessLaunchInfo; 38 } 39 40 static bool 41 GetOpenBSDProcessArgs(const ProcessInstanceInfoMatch *match_info_ptr, 42 ProcessInstanceInfo &process_info) { 43 if (process_info.ProcessIDIsValid()) { 44 int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_ARGS, 45 (int)process_info.GetProcessID()}; 46 47 char arg_data[8192]; 48 size_t arg_data_size = sizeof(arg_data); 49 if (::sysctl(mib, 4, arg_data, &arg_data_size, NULL, 0) == 0) { 50 DataExtractor data(arg_data, arg_data_size, endian::InlHostByteOrder(), 51 sizeof(void *)); 52 lldb::offset_t offset = 0; 53 const char *cstr; 54 55 cstr = data.GetCStr(&offset); 56 if (cstr) { 57 process_info.GetExecutableFile().SetFile(cstr, FileSpec::Style::native); 58 59 if (!(match_info_ptr == NULL || 60 NameMatches( 61 process_info.GetExecutableFile().GetFilename().GetCString(), 62 match_info_ptr->GetNameMatchType(), 63 match_info_ptr->GetProcessInfo().GetName()))) 64 return false; 65 66 Args &proc_args = process_info.GetArguments(); 67 while (1) { 68 const uint8_t *p = data.PeekData(offset, 1); 69 while ((p != NULL) && (*p == '\0') && offset < arg_data_size) { 70 ++offset; 71 p = data.PeekData(offset, 1); 72 } 73 if (p == NULL || offset >= arg_data_size) 74 return true; 75 76 cstr = data.GetCStr(&offset); 77 if (cstr) 78 proc_args.AppendArgument(llvm::StringRef(cstr)); 79 else 80 return true; 81 } 82 } 83 } 84 } 85 return false; 86 } 87 88 static bool GetOpenBSDProcessCPUType(ProcessInstanceInfo &process_info) { 89 if (process_info.ProcessIDIsValid()) { 90 process_info.GetArchitecture() = 91 HostInfo::GetArchitecture(HostInfo::eArchKindDefault); 92 return true; 93 } 94 process_info.GetArchitecture().Clear(); 95 return false; 96 } 97 98 static bool GetOpenBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) { 99 struct kinfo_proc proc_kinfo; 100 size_t proc_kinfo_size; 101 102 if (process_info.ProcessIDIsValid()) { 103 int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, 104 (int)process_info.GetProcessID()}; 105 proc_kinfo_size = sizeof(struct kinfo_proc); 106 107 if (::sysctl(mib, 4, &proc_kinfo, &proc_kinfo_size, NULL, 0) == 0) { 108 if (proc_kinfo_size > 0) { 109 process_info.SetParentProcessID(proc_kinfo.p_ppid); 110 process_info.SetUserID(proc_kinfo.p_ruid); 111 process_info.SetGroupID(proc_kinfo.p_rgid); 112 process_info.SetEffectiveUserID(proc_kinfo.p_uid); 113 process_info.SetEffectiveGroupID(proc_kinfo.p_gid); 114 return true; 115 } 116 } 117 } 118 process_info.SetParentProcessID(LLDB_INVALID_PROCESS_ID); 119 process_info.SetUserID(UINT32_MAX); 120 process_info.SetGroupID(UINT32_MAX); 121 process_info.SetEffectiveUserID(UINT32_MAX); 122 process_info.SetEffectiveGroupID(UINT32_MAX); 123 return false; 124 } 125 126 uint32_t Host::FindProcessesImpl(const ProcessInstanceInfoMatch &match_info, 127 ProcessInstanceInfoList &process_infos) { 128 std::vector<struct kinfo_proc> kinfos; 129 130 int mib[3] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL}; 131 132 size_t pid_data_size = 0; 133 if (::sysctl(mib, 3, NULL, &pid_data_size, NULL, 0) != 0) 134 return 0; 135 136 // Add a few extra in case a few more show up 137 const size_t estimated_pid_count = 138 (pid_data_size / sizeof(struct kinfo_proc)) + 10; 139 140 kinfos.resize(estimated_pid_count); 141 pid_data_size = kinfos.size() * sizeof(struct kinfo_proc); 142 143 if (::sysctl(mib, 3, &kinfos[0], &pid_data_size, NULL, 0) != 0) 144 return 0; 145 146 const size_t actual_pid_count = (pid_data_size / sizeof(struct kinfo_proc)); 147 148 bool all_users = match_info.GetMatchAllUsers(); 149 const ::pid_t our_pid = getpid(); 150 const uid_t our_uid = getuid(); 151 for (size_t i = 0; i < actual_pid_count; i++) { 152 const struct kinfo_proc &kinfo = kinfos[i]; 153 const bool kinfo_user_matches = (all_users || (kinfo.p_ruid == our_uid) || 154 // Special case, if lldb is being run as 155 // root we can attach to anything. 156 (our_uid == 0)); 157 158 if (kinfo_user_matches == false || // Make sure the user is acceptable 159 kinfo.p_pid == our_pid || // Skip this process 160 kinfo.p_pid == 0 || // Skip kernel (kernel pid is zero) 161 kinfo.p_stat == SZOMB || // Zombies are bad, they like brains... 162 kinfo.p_psflags & PS_TRACED || // Being debugged? 163 kinfo.p_flag & P_WEXIT) // Working on exiting 164 continue; 165 166 ProcessInstanceInfo process_info; 167 process_info.SetProcessID(kinfo.p_pid); 168 process_info.SetParentProcessID(kinfo.p_ppid); 169 process_info.SetUserID(kinfo.p_ruid); 170 process_info.SetGroupID(kinfo.p_rgid); 171 process_info.SetEffectiveUserID(kinfo.p_svuid); 172 process_info.SetEffectiveGroupID(kinfo.p_svgid); 173 174 // Make sure our info matches before we go fetch the name and cpu type 175 if (match_info.Matches(process_info) && 176 GetOpenBSDProcessArgs(&match_info, process_info)) { 177 GetOpenBSDProcessCPUType(process_info); 178 if (match_info.Matches(process_info)) 179 process_infos.push_back(process_info); 180 } 181 } 182 183 return process_infos.size(); 184 } 185 186 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) { 187 process_info.SetProcessID(pid); 188 189 if (GetOpenBSDProcessArgs(NULL, process_info)) { 190 // should use libprocstat instead of going right into sysctl? 191 GetOpenBSDProcessCPUType(process_info); 192 GetOpenBSDProcessUserAndGroup(process_info); 193 return true; 194 } 195 196 process_info.Clear(); 197 return false; 198 } 199 200 Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) { 201 return Status::FromErrorString("unimplemented"); 202 } 203