Mercurial > libanimone

annotate src/fd/proc.cc @ 30:a76e55e098d1

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util: rewrite functions in C-ish there are C++ bindings still put in place. the code should be valid C, except for the use of <regex>, which ought to go anyway. eventually I'll actually *test* this stuff aside from the TrimRight crap
author Paper <paper@tflc.us>
date Sun, 09 Feb 2025 23:18:57 -0500
parents 13b647714159
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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19
6596be6917a1 dep/animone: prepare for v1.0 release; it should be ready by now
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1 /*
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2 * fd/win32.cc: support for linux's /proc filesystem
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3 *
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4 * plan 9 caused this monstrocity...
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5 */
14
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6 #include "animone/fd/proc.h"
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7 #include "animone.h"
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8 #include "animone/util.h"
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9
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10 #include <filesystem>
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11 #include <fstream>
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12 #include <sstream>
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13 #include <string>
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14 #include <algorithm>
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15
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16 #include <fcntl.h>
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17 #include <sys/stat.h>
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18 #include <unistd.h>
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19
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20 static constexpr std::string_view PROC_LOCATION = "/proc";
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21
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22 namespace animone::internal::proc {
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23
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24 struct Fdinfo {
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25 bool Parse(std::istream& istr);
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26 std::unordered_map<std::string, std::string> data;
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27 };
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28
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29 bool Fdinfo::Parse(std::istream& istr) {
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30 /* shift to the start of the stream */
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31 istr.seekg(0);
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32
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33 for (std::string line; std::getline(istr, line); ) {
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34 if (line.empty()) /* huh? */
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35 continue;
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36
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37 std::size_t colon = line.find(':');
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38 if (colon == std::string::npos)
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39 return false;
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40
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41 std::string key = line.substr(0, colon);
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42 std::string value = line.substr(colon + 1);
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43 util::TrimLeft(value, " ");
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44
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45 data[key] = value;
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46 }
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47
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48 return true;
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49 }
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50
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51 static bool IsRegularFile(const std::string& link) {
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52 struct stat sb;
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53 if (stat(link.c_str(), &sb) == -1)
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54 return false;
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55
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56 return S_ISREG(sb.st_mode);
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57 }
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58
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59 static bool AreFlagsOk(pid_t pid, int fd) {
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60 const std::filesystem::path path =
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61 std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "fdinfo" / std::to_string(fd);
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62
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63 std::ifstream file(path);
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64 if (!file)
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65 return false;
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66
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67 Fdinfo fdinfo;
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68 if (!fdinfo.Parse(file))
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69 return false;
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70
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71 if (fdinfo.data.find("flags") == fdinfo.data.end())
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72 return false;
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73
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74 /* check if the file was opened in a write mode */
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75 try {
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76 const long long accflags = std::stoll(fdinfo.data["flags"]) & O_ACCMODE;
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77
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78 if (accflags == O_WRONLY || accflags == O_RDWR)
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79 return false;
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80 } catch (const std::exception& ex) {
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81 return false; /* huh ? */
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82 }
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83
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84 return true;
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85 }
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86
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87 static bool GetFilenameFromFd(std::string link, std::string& out) {
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88 /* /proc is a "virtual filesystem", so we have to guess the path size. yippee! */
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89 constexpr size_t OUT_MAX = (1ul << 15); // 32KiB
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90 out.resize(32);
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91
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92 ssize_t exe_used = 0;
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93 do {
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94 out.resize(out.length() * 2);
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95
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96 exe_used = readlink(link.c_str(), &out.front(), out.length());
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97 if (exe_used == (ssize_t)-1 || exe_used < (ssize_t)1)
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98 return false; // we got a bad result. SAD!
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99 } while (out.length() < OUT_MAX && exe_used >= static_cast<ssize_t>(out.length()));
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100
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101 out.resize(out.find('\0'));
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102
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103 return true;
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104 }
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105
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106 static bool IsSystemFile(const std::string& path) {
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107 static constexpr std::array<std::string_view, 9> invalid_paths = {"/boot", "/dev", "/bin", "/usr", "/opt",
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108 "/proc", "/var", "/etc", "/dev"};
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109
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110 for (const auto& invalid_path : invalid_paths)
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111 if (!path.rfind(invalid_path, 0))
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112 return true;
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113
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114 return false;
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115 }
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116
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117 bool GetProcessName(pid_t pid, std::string& result) {
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118 const std::filesystem::path path = std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "comm";
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119
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120 if (!util::ReadFile(path, result))
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121 return false;
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122
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123 result.erase(std::remove(result.begin(), result.end(), '\n'), result.cend());
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124 return true;
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125 }
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126
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127 bool EnumerateOpenProcesses(process_proc_t process_proc) {
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128 bool success = false;
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129
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130 for (const auto& dir : std::filesystem::directory_iterator{PROC_LOCATION}) {
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131 Process proc;
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132 proc.platform = ExecutablePlatform::Posix;
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133
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134 try {
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135 proc.pid = util::StringToInt(dir.path().stem());
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136 success = true;
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137 } catch (std::invalid_argument const& ex) {
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138 continue;
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139 }
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140
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141 if (!GetProcessName(proc.pid, proc.comm))
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142 continue;
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143
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144 if (!process_proc(proc))
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145 return false;
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146 }
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147
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148 return success;
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149 }
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150
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151 bool EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
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152 if (!open_file_proc)
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153 return false;
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154
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155 for (const auto& pid : pids) {
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156 const std::filesystem::path path = std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "fd";
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157
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158 for (const auto& dir : std::filesystem::directory_iterator{path}) {
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159 if (!AreFlagsOk(pid, util::StringToInt(dir.path().stem())))
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160 continue;
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161
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162 std::string name;
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163 if (!GetFilenameFromFd(dir.path(), name))
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164 continue;
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165
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166 if (!IsRegularFile(name))
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167 continue;
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168
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169 if (IsSystemFile(name))
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170 continue;
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171
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172 if (!open_file_proc({pid, name}))
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173 return false;
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174 }
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175 }
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176 return true;
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177 }
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178
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179 } // namespace animia::internal::proc