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/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 int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_ARGS, 62 (int)process_info.GetProcessID()}; 63 64 char arg_data[8192]; 65 size_t arg_data_size = sizeof(arg_data); 66 if (::sysctl(mib, 4, arg_data, &arg_data_size, NULL, 0) == 0) { 67 DataExtractor data(arg_data, arg_data_size, endian::InlHostByteOrder(), 68 sizeof(void *)); 69 lldb::offset_t offset = 0; 70 const char *cstr; 71 72 cstr = data.GetCStr(&offset); 73 if (cstr) { 74 process_info.GetExecutableFile().SetFile(cstr, FileSpec::Style::native); 75 76 if (!(match_info_ptr == NULL || 77 NameMatches( 78 process_info.GetExecutableFile().GetFilename().GetCString(), 79 match_info_ptr->GetNameMatchType(), 80 match_info_ptr->GetProcessInfo().GetName()))) 81 return false; 82 83 Args &proc_args = process_info.GetArguments(); 84 while (1) { 85 const uint8_t *p = data.PeekData(offset, 1); 86 while ((p != NULL) && (*p == '\0') && offset < arg_data_size) { 87 ++offset; 88 p = data.PeekData(offset, 1); 89 } 90 if (p == NULL || offset >= arg_data_size) 91 return true; 92 93 cstr = data.GetCStr(&offset); 94 if (cstr) 95 proc_args.AppendArgument(llvm::StringRef(cstr)); 96 else 97 return true; 98 } 99 } 100 } 101 } 102 return false; 103 } 104 105 static bool GetOpenBSDProcessCPUType(ProcessInstanceInfo &process_info) { 106 if (process_info.ProcessIDIsValid()) { 107 process_info.GetArchitecture() = 108 HostInfo::GetArchitecture(HostInfo::eArchKindDefault); 109 return true; 110 } 111 process_info.GetArchitecture().Clear(); 112 return false; 113 } 114 115 static bool GetOpenBSDProcessUserAndGroup(ProcessInstanceInfo &process_info) { 116 struct kinfo_proc proc_kinfo; 117 size_t proc_kinfo_size; 118 119 if (process_info.ProcessIDIsValid()) { 120 int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, 121 (int)process_info.GetProcessID()}; 122 proc_kinfo_size = sizeof(struct kinfo_proc); 123 124 if (::sysctl(mib, 4, &proc_kinfo, &proc_kinfo_size, NULL, 0) == 0) { 125 if (proc_kinfo_size > 0) { 126 process_info.SetParentProcessID(proc_kinfo.p_ppid); 127 process_info.SetUserID(proc_kinfo.p_ruid); 128 process_info.SetGroupID(proc_kinfo.p_rgid); 129 process_info.SetEffectiveUserID(proc_kinfo.p_uid); 130 process_info.SetEffectiveGroupID(proc_kinfo.p_gid); 131 return true; 132 } 133 } 134 } 135 process_info.SetParentProcessID(LLDB_INVALID_PROCESS_ID); 136 process_info.SetUserID(UINT32_MAX); 137 process_info.SetGroupID(UINT32_MAX); 138 process_info.SetEffectiveUserID(UINT32_MAX); 139 process_info.SetEffectiveGroupID(UINT32_MAX); 140 return false; 141 } 142 143 uint32_t Host::FindProcessesImpl(const ProcessInstanceInfoMatch &match_info, 144 ProcessInstanceInfoList &process_infos) { 145 std::vector<struct kinfo_proc> kinfos; 146 147 int mib[3] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL}; 148 149 size_t pid_data_size = 0; 150 if (::sysctl(mib, 3, NULL, &pid_data_size, NULL, 0) != 0) 151 return 0; 152 153 // Add a few extra in case a few more show up 154 const size_t estimated_pid_count = 155 (pid_data_size / sizeof(struct kinfo_proc)) + 10; 156 157 kinfos.resize(estimated_pid_count); 158 pid_data_size = kinfos.size() * sizeof(struct kinfo_proc); 159 160 if (::sysctl(mib, 3, &kinfos[0], &pid_data_size, NULL, 0) != 0) 161 return 0; 162 163 const size_t actual_pid_count = (pid_data_size / sizeof(struct kinfo_proc)); 164 165 bool all_users = match_info.GetMatchAllUsers(); 166 const ::pid_t our_pid = getpid(); 167 const uid_t our_uid = getuid(); 168 for (size_t i = 0; i < actual_pid_count; i++) { 169 const struct kinfo_proc &kinfo = kinfos[i]; 170 const bool kinfo_user_matches = (all_users || (kinfo.p_ruid == our_uid) || 171 // Special case, if lldb is being run as 172 // root we can attach to anything. 173 (our_uid == 0)); 174 175 if (kinfo_user_matches == false || // Make sure the user is acceptable 176 kinfo.p_pid == our_pid || // Skip this process 177 kinfo.p_pid == 0 || // Skip kernel (kernel pid is zero) 178 kinfo.p_stat == SZOMB || // Zombies are bad, they like brains... 179 kinfo.p_psflags & PS_TRACED || // Being debugged? 180 kinfo.p_flag & P_WEXIT) // Working on exiting 181 continue; 182 183 ProcessInstanceInfo process_info; 184 process_info.SetProcessID(kinfo.p_pid); 185 process_info.SetParentProcessID(kinfo.p_ppid); 186 process_info.SetUserID(kinfo.p_ruid); 187 process_info.SetGroupID(kinfo.p_rgid); 188 process_info.SetEffectiveUserID(kinfo.p_svuid); 189 process_info.SetEffectiveGroupID(kinfo.p_svgid); 190 191 // Make sure our info matches before we go fetch the name and cpu type 192 if (match_info.Matches(process_info) && 193 GetOpenBSDProcessArgs(&match_info, process_info)) { 194 GetOpenBSDProcessCPUType(process_info); 195 if (match_info.Matches(process_info)) 196 process_infos.push_back(process_info); 197 } 198 } 199 200 return process_infos.size(); 201 } 202 203 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) { 204 process_info.SetProcessID(pid); 205 206 if (GetOpenBSDProcessArgs(NULL, process_info)) { 207 // should use libprocstat instead of going right into sysctl? 208 GetOpenBSDProcessCPUType(process_info); 209 GetOpenBSDProcessUserAndGroup(process_info); 210 return true; 211 } 212 213 process_info.Clear(); 214 return false; 215 } 216 217 Status Host::ShellExpandArguments(ProcessLaunchInfo &launch_info) { 218 return Status("unimplemented"); 219 } 220