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annotate dep/animia/src/fd/xnu.cc @ 160:900b5b530883

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dep/animia: fd/xnu: use path args to get executable filename
author Paper <mrpapersonic@gmail.com>
date Fri, 17 Nov 2023 12:37:31 -0500
parents 18c8eb5d1edc
children 61b76c7b656a
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1 /*
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2 ** fd/xnu.cpp
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3 ** - provides support for XNU (part of Darwin)
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4 */
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5 #include "animia/fd/xnu.h"
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6 #include "animia.h"
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7
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8 #include <cassert>
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9 #include <string>
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10 #include <unordered_map>
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11 #include <vector>
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12 #include <memory>
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13
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14 #include <fcntl.h>
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15 #include <libproc.h>
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16 #include <sys/sysctl.h>
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17 #include <sys/types.h>
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18 #include <sys/user.h>
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19
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20 #include <iostream>
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21
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22 namespace animia::internal::xnu {
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23
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24 static bool GetProcessNameFromArgs(pid_t pid, std::string& result) {
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25 /* sysctl shouldn't touch these, so we define them as const */
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26 const int mib[3] = {CTL_KERN, KERN_PROCARGS2, static_cast<int>(pid)};
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27 const size_t mib_size = sizeof(mib)/sizeof(*mib);
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28
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29 /* Get the initial size of the array */
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30 size_t size;
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31 int ret = sysctl((int*)mib, mib_size, nullptr, &size, nullptr, 0);
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32 if (ret)
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33 return false;
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34
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35 /* Reserve the space for it in a std::string */
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36 std::string args;
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37 args.resize(size);
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38
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39 /* Get the contents of argc and argv */
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40 ret = sysctl((int*)mib, mib_size, &args.front(), &size, NULL, 0);
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41 if (ret)
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42 return false;
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43
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44 /* Is the size big enough to hold at least argc? */
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45 if (size < sizeof(int))
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46 return false;
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47
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48 args.resize(size);
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49
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50 /* Get argc using memcpy */
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51 int argc;
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52 memcpy(&argc, &args.front(), sizeof(argc));
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53
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54 /* Check for a condition that, realistically, would never happen,
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55 but better to be safe than sorry */
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56 if (argc < 1)
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57 return false;
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58
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59 /* Find the first null character */
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60 size_t null_pos = args.find('\0', sizeof(argc));
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61 if (null_pos == std::string::npos)
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62 return false;
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63
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64 /* Find the last slash */
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65 size_t last_slash = args.rfind('/', null_pos);
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66 if (last_slash == std::string::npos)
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67 return false;
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68
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69 /* Return our result */
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70 result = args.substr(last_slash + 1, null_pos - last_slash - 1);
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71 return true;
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72 }
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73
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74 static bool GetProcessNameFromKernel(pid_t pid, std::string& result) {
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75 result.reserve(2*MAXCOMLEN);
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76 if (!proc_name(pid, &result.front(), result.length()))
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77 return false;
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78
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79 result.shrink_to_fit();
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80 return true;
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81 }
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82
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83 static bool GetProcessName(pid_t pid, std::string& result) {
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84 /* First try parsing the arguments, this prevents the process name being
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85 cut off to 2*MAXCOMLEN (32 chars) */
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86 if (GetProcessNameFromArgs(pid, result))
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87 return true;
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88
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89 /* Then attempt getting it from the kernel, which results in the process name
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90 being cut to 32 chars (16 chars if p_name is unavailable) */
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91 if (GetProcessNameFromKernel(pid, result))
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92 return true;
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93
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94 return false;
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95 }
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96
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97 bool XnuFdTools::EnumerateOpenProcesses(process_proc_t process_proc) {
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98 size_t pids_size = 512;
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99 std::unique_ptr<pid_t[]> pids;
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100
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101 int returned_size = 0;
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102 do {
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103 pids.reset(new pid_t[pids_size]);
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104 returned_size = proc_listpids(PROC_ALL_PIDS, 0, pids.get(), pids_size * sizeof(pid_t));
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105 if (returned_size == -1)
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106 return false;
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107 } while ((pids_size * sizeof(size_t)) < returned_size);
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108
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109 for (int i = 0; i < pids_size; i++) {
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110 std::string result;
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111 GetProcessName(pids[i], result);
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112 if (!process_proc({pids[i], result}))
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113 return false;
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114 }
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115
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116 return true;
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117 }
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118
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119 bool XnuFdTools::EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
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120 if (!open_file_proc)
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121 return false;
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122
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123 for (const auto& pid : pids) {
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124 int bufsz = proc_pidinfo(pid, PROC_PIDLISTFDS, 0, NULL, 0);
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125 if (bufsz == -1)
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126 return false;
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127
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128 struct proc_fdinfo* info = (struct proc_fdinfo*)malloc(bufsz);
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129 if (!info)
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130 return false;
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131
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132 proc_pidinfo(pid, PROC_PIDLISTFDS, 0, info, bufsz);
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133
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134 for (int i = 0; i < bufsz / sizeof(info[0]); i++) {
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135 if (info[i].proc_fdtype == PROX_FDTYPE_VNODE) {
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136 struct vnode_fdinfowithpath vnodeInfo;
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137
156
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138 int sz = proc_pidfdinfo(pid, info[i].proc_fd, PROC_PIDFDVNODEPATHINFO, &vnodeInfo,
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139 PROC_PIDFDVNODEPATHINFO_SIZE);
153
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140 if (sz != PROC_PIDFDVNODEPATHINFO_SIZE)
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141 return false;
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142
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143 /* this doesn't work!
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144 if (vnodeInfo.pfi.fi_openflags & O_WRONLY || vnodeInfo.pfi.fi_openflags & O_RDWR)
156
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145 continue;
153
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146 */
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147
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148 if (!open_file_proc({pid, vnodeInfo.pvip.vip_path}))
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149 return false;
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150 }
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151 }
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152 }
154
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153
153
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154 return true;
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155 }
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156
156
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157 } // namespace animia::internal::xnu