Mercurial > libanimone

annotate src/fd/proc.cc @ 17:b83c9257d68f

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cleanup: remove extraneous executable flags
author Paper <paper@paper.us.eu.org>
date Sun, 19 May 2024 17:48:52 -0400
parents 27b988a1048c
children 04b412228ca7
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14
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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
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10 #include <fcntl.h>
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11 #include <sys/stat.h>
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12 #include <unistd.h>
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13
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14 static constexpr std::string_view PROC_LOCATION = "/proc";
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15
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16 namespace animone::internal::proc {
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17
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18 static bool IsRegularFile(std::string link) {
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19 struct stat sb;
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20 if (stat(link.c_str(), &sb) == -1)
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21 return false;
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22
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23 return S_ISREG(sb.st_mode);
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24 }
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25
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26 static bool AreFlagsOk(pid_t pid, int fd) {
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27 const std::filesystem::path path =
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28 std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "fdinfo" / std::to_string(fd);
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29
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30 std::ifstream file(path);
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31 if (!file)
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32 return false;
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33
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34 int flags = 0;
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35 for (std::string line; std::getline(file, line);)
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36 if (line.find("flags:", 0) == 0)
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37 flags = util::StringToInt(line.substr(line.find_last_not_of("0123456789") + 1));
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38
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39 /* check if the file was opened in a write mode */
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40 int accflags = flags & O_ACCMODE;
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41 if (accflags == O_WRONLY || accflags == O_RDWR)
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42 return false;
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43
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44 return true;
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45 }
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46
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47 static bool GetFilenameFromFd(std::string link, std::string& out) {
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48 /* /proc is a "virtual filesystem", so we have to guess the path size. yippee! */
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49 constexpr size_t OUT_MAX = (1ul << 15); // 32KiB
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50 out.resize(32);
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51
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52 ssize_t exe_used = 0;
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53 do {
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54 out.resize(out.length() * 2);
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55
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56 exe_used = readlink(link.c_str(), &out.front(), out.length());
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57 if (exe_used == (ssize_t)-1 || exe_used < (ssize_t)1)
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58 return false; // we got a bad result. SAD!
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59 } while (out.length() < OUT_MAX && exe_used >= static_cast<ssize_t>(out.length()));
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60
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61 out.resize(out.find('\0'));
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62
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63 return true;
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64 }
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65
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66 static bool IsSystemFile(const std::string& path) {
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67 static constexpr std::array<std::string_view, 9> invalid_paths = {"/boot", "/dev", "/bin", "/usr", "/opt",
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68 "/proc", "/var", "/etc", "/dev"};
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69
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70 for (const auto& invalid_path : invalid_paths)
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71 if (!path.rfind(invalid_path, 0))
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72 return true;
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73
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74 return false;
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75 }
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76
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77 bool GetProcessName(pid_t pid, std::string& result) {
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78 const std::filesystem::path path = std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "comm";
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79
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80 if (!util::ReadFile(path, result))
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81 return false;
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82
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83 result.erase(std::remove(result.begin(), result.end(), '\n'), result.end());
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84 return true;
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85 }
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86
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87 bool EnumerateOpenProcesses(process_proc_t process_proc) {
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88 bool success = false;
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89
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90 for (const auto& dir : std::filesystem::directory_iterator{PROC_LOCATION}) {
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91 Process proc;
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92
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93 try {
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94 proc.pid = util::StringToInt(dir.path().stem());
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95 success = true;
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96 } catch (std::invalid_argument const& ex) {
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97 continue;
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98 }
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99
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100 if (!GetProcessName(proc.pid, proc.name))
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101 continue;
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102
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103 if (!process_proc(proc))
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104 return false;
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105 }
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106
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107 return success;
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108 }
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109
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110 bool EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
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111 if (!open_file_proc)
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112 return false;
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113
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114 for (const auto& pid : pids) {
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115 const std::filesystem::path path = std::filesystem::path(PROC_LOCATION) / std::to_string(pid) / "fd";
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116
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117 for (const auto& dir : std::filesystem::directory_iterator{path}) {
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118 if (!AreFlagsOk(pid, util::StringToInt(dir.path().stem())))
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119 continue;
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120
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121 std::string name;
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122 if (!GetFilenameFromFd(dir.path(), name))
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123 continue;
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124
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125 if (!IsRegularFile(name))
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126 continue;
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127
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128 if (IsSystemFile(name))
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129 continue;
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130
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131 if (!open_file_proc({pid, name}))
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132 return false;
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133 }
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134 }
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135 return true;
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136 }
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137
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138 } // namespace animia::internal::proc