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annotate dep/animone/src/fd/proc.cc @ 309:bf89fbf7ff38

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misc: remove copyrighted app icon if someone comes up with a good icon, please be my guest
author Paper <paper@paper.us.eu.org>
date Tue, 11 Jun 2024 04:24:59 -0400
parents b1f625b0227c
children a4257370de16
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1 #include "animone/fd/proc.h"
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2 #include "animone.h"
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3 #include "animone/util.h"
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4
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5 #include <filesystem>
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6 #include <fstream>
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7 #include <sstream>
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8 #include <string>
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9 #include <algorithm>
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10
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11 #include <fcntl.h>
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12 #include <sys/stat.h>
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13 #include <unistd.h>
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14
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15 static constexpr std::string_view PROC_LOCATION = "/proc";
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16
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17 namespace animone::internal::proc {
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18
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19 static bool IsRegularFile(std::string link) {
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20 struct stat sb;
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21 if (stat(link.c_str(), &sb) == -1)
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22 return false;
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23
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24 return S_ISREG(sb.st_mode);
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25 }
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26
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27 static bool AreFlagsOk(pid_t pid, int fd) {
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28 const std::filesystem::path path =
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29 std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "fdinfo" / std::to_string(fd);
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30
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31 std::ifstream file(path);
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32 if (!file)
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33 return false;
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34
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35 int flags = 0;
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36 for (std::string line; std::getline(file, line);)
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37 if (line.find("flags:", 0) == 0)
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38 flags = util::StringToInt(line.substr(line.find_last_not_of("0123456789") + 1));
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39
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40 /* check if the file was opened in a write mode */
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41 int accflags = flags & O_ACCMODE;
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42 if (accflags == O_WRONLY || accflags == O_RDWR)
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43 return false;
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44
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45 return true;
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46 }
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47
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48 static bool GetFilenameFromFd(std::string link, std::string& out) {
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49 /* /proc is a "virtual filesystem", so we have to guess the path size. yippee! */
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50 constexpr size_t OUT_MAX = (1ul << 15); // 32KiB
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51 out.resize(32);
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52
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53 ssize_t exe_used = 0;
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54 do {
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55 out.resize(out.length() * 2);
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56
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57 exe_used = readlink(link.c_str(), &out.front(), out.length());
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58 if (exe_used == (ssize_t)-1 || exe_used < (ssize_t)1)
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59 return false; // we got a bad result. SAD!
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60 } while (out.length() < OUT_MAX && exe_used >= static_cast<ssize_t>(out.length()));
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61
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62 out.resize(out.find('\0'));
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63
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64 return true;
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65 }
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66
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67 static bool IsSystemFile(const std::string& path) {
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68 static constexpr std::array<std::string_view, 9> invalid_paths = {"/boot", "/dev", "/bin", "/usr", "/opt",
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69 "/proc", "/var", "/etc", "/dev"};
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70
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71 for (const auto& invalid_path : invalid_paths)
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72 if (!path.rfind(invalid_path, 0))
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73 return true;
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74
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75 return false;
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76 }
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77
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78 bool GetProcessName(pid_t pid, std::string& result) {
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79 const std::filesystem::path path = std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "comm";
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80
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81 if (!util::ReadFile(path, result))
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82 return false;
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83
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84 result.erase(std::remove(result.begin(), result.end(), '\n'), result.cend());
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85 return true;
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86 }
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87
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88 bool EnumerateOpenProcesses(process_proc_t process_proc) {
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89 bool success = false;
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90
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91 for (const auto& dir : std::filesystem::directory_iterator{PROC_LOCATION}) {
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92 Process proc;
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93
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94 try {
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95 proc.pid = util::StringToInt(dir.path().stem());
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96 success = true;
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97 } catch (std::invalid_argument const& ex) {
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98 continue;
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99 }
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100
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101 if (!GetProcessName(proc.pid, proc.name))
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102 continue;
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103
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104 if (!process_proc(proc))
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105 return false;
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106 }
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107
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108 return success;
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109 }
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110
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111 bool EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
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112 if (!open_file_proc)
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113 return false;
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114
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115 for (const auto& pid : pids) {
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116 const std::filesystem::path path = std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "fd";
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117
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118 for (const auto& dir : std::filesystem::directory_iterator{path}) {
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119 if (!AreFlagsOk(pid, util::StringToInt(dir.path().stem())))
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120 continue;
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121
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122 std::string name;
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123 if (!GetFilenameFromFd(dir.path(), name))
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124 continue;
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125
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126 if (!IsRegularFile(name))
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127 continue;
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128
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129 if (IsSystemFile(name))
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130 continue;
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131
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132 if (!open_file_proc({pid, name}))
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133 return false;
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134 }
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135 }
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136 return true;
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137 }
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138
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139 } // namespace animia::internal::proc