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annotate dep/animone/src/fd/proc.cc @ 320:1b5c04268d6a

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services/kitsu: ACTUALLY finish GetAnimeList there are some things the API just... doesn't provide. therefore we have to request the genres separately any time a new anime info box is opened...
author Paper <paper@paper.us.eu.org>
date Wed, 12 Jun 2024 19:49:19 -0400
parents a4257370de16
children a7d4e5107531
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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 */
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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 static bool IsRegularFile(std::string link) {
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25 struct stat sb;
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26 if (stat(link.c_str(), &sb) == -1)
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27 return false;
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28
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29 return S_ISREG(sb.st_mode);
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30 }
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31
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32 static bool AreFlagsOk(pid_t pid, int fd) {
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33 const std::filesystem::path path =
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34 std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "fdinfo" / std::to_string(fd);
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35
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36 std::ifstream file(path);
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37 if (!file)
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38 return false;
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39
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40 int flags = 0;
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41 for (std::string line; std::getline(file, line);)
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42 if (line.find("flags:", 0) == 0)
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43 flags = util::StringToInt(line.substr(line.find_last_not_of("0123456789") + 1));
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44
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45 /* check if the file was opened in a write mode */
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46 int accflags = flags & O_ACCMODE;
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47 if (accflags == O_WRONLY || accflags == O_RDWR)
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48 return false;
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49
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50 return true;
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51 }
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52
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53 static bool GetFilenameFromFd(std::string link, std::string& out) {
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54 /* /proc is a "virtual filesystem", so we have to guess the path size. yippee! */
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55 constexpr size_t OUT_MAX = (1ul << 15); // 32KiB
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56 out.resize(32);
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57
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58 ssize_t exe_used = 0;
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59 do {
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60 out.resize(out.length() * 2);
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61
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62 exe_used = readlink(link.c_str(), &out.front(), out.length());
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63 if (exe_used == (ssize_t)-1 || exe_used < (ssize_t)1)
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64 return false; // we got a bad result. SAD!
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65 } while (out.length() < OUT_MAX && exe_used >= static_cast<ssize_t>(out.length()));
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66
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67 out.resize(out.find('\0'));
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68
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69 return true;
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70 }
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71
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72 static bool IsSystemFile(const std::string& path) {
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73 static constexpr std::array<std::string_view, 9> invalid_paths = {"/boot", "/dev", "/bin", "/usr", "/opt",
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74 "/proc", "/var", "/etc", "/dev"};
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75
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76 for (const auto& invalid_path : invalid_paths)
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77 if (!path.rfind(invalid_path, 0))
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78 return true;
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79
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80 return false;
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81 }
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82
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83 bool GetProcessName(pid_t pid, std::string& result) {
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84 const std::filesystem::path path = std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "comm";
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85
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86 if (!util::ReadFile(path, result))
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87 return false;
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88
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89 result.erase(std::remove(result.begin(), result.end(), '\n'), result.cend());
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90 return true;
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91 }
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92
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93 bool EnumerateOpenProcesses(process_proc_t process_proc) {
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94 bool success = false;
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95
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96 for (const auto& dir : std::filesystem::directory_iterator{PROC_LOCATION}) {
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97 Process proc;
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98
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99 try {
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100 proc.pid = util::StringToInt(dir.path().stem());
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101 success = true;
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102 } catch (std::invalid_argument const& ex) {
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103 continue;
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104 }
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105
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106 if (!GetProcessName(proc.pid, proc.name))
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107 continue;
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108
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109 if (!process_proc(proc))
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110 return false;
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111 }
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112
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113 return success;
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114 }
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115
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116 bool EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
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117 if (!open_file_proc)
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118 return false;
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119
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120 for (const auto& pid : pids) {
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121 const std::filesystem::path path = std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "fd";
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122
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123 for (const auto& dir : std::filesystem::directory_iterator{path}) {
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124 if (!AreFlagsOk(pid, util::StringToInt(dir.path().stem())))
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125 continue;
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126
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127 std::string name;
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128 if (!GetFilenameFromFd(dir.path(), name))
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129 continue;
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130
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131 if (!IsRegularFile(name))
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132 continue;
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133
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134 if (IsSystemFile(name))
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135 continue;
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136
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137 if (!open_file_proc({pid, name}))
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138 return false;
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139 }
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140 }
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141 return true;
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142 }
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143
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144 } // namespace animia::internal::proc